Which credential should your tradesperson have?

By UK law, anyone who works on gas appliances must be on the Gas Safe Register. If they are not, it is illegal — full stop.

How to check: Ask to see their Gas Safe ID card, then check the 7-digit licence number on the official register.

Membership of an approved competent-person scheme means they can self-certify electrical work as meeting Part P building regulations — no separate council inspection needed.

How to check: Ask which scheme they belong to and check their membership on that scheme's find-a-contractor tool.

Membership of a recognised plumbing body (Chartered Institute of Plumbing & Heating Engineering, Association of Plumbing & Heating Contractors, or the WaterSafe scheme) indicates vetted, qualified plumbers.

How to check: Check the member's name on the relevant body's directory.

If the job involves a gas boiler or appliance, Gas Safe registration is a legal requirement.

How to check: Check the licence number on the Gas Safe Register.

NFRC trade members pass an office and on-site audit and are re-audited — a meaningful, trade-specific check on a roofer.

How to check: Check the firm in the NFRC trade-member directory.

Self-certification of building-regulation compliance for re-roofing, plus a guarantee that's underwritten by insurance (so it survives if the firm folds).

How to check: Ask for the guarantee provider and check it covers your work.

FMB members are independently vetted and inspected; the FMB also offers a build contract and dispute resolution.

How to check: Search the FMB Find-a-Builder directory.

A 10-year structural warranty protects you if defects appear after completion — essential for new builds and major structural work.

How to check: Ask which warranty provider will cover the work and confirm registration.

Check the company is active (not dissolved or in liquidation) and how long it has traded before paying a deposit.

How to check: Search the company on the official Companies House register.

MCS certification is mandatory to claim the Boiler Upgrade Scheme grant and other renewable incentives, and signals competent, standards-compliant installation.

How to check: Search the installer on the official MCS register.

A consumer-code membership gives you deposit protection and dispute resolution on a large renewables contract.

How to check: Check the firm on the RECC member list.

Registration means installations are self-certified as meeting building regulations, with a deposit/insurance-backed guarantee — you get a certificate you'll need when you sell.

How to check: After the work, you should receive a FENSA/CERTASS certificate; check the installer is registered.

GGF members agree to a code of practice and offer a deposit indemnity scheme.

How to check: Search the GGF member directory.

MLA members are vetted, qualified, and inspected, and undergo DBS criminal-record checks — the closest thing to regulation in an unregulated trade.

How to check: Check the locksmith on the MLA find-a-locksmith directory before letting them into your home.

BPCA members are qualified, insured and audited, and follow safe-use codes for pesticides.

How to check: Search the BPCA find-a-controller tool.

PCA members are qualified surveyors/contractors audited for competence in damp, timber and structural waterproofing.

How to check: Check the firm on the PCA find-a-member directory.

Approved Contractor status means independently assessed competence, safety and insurance for tree work.

How to check: Search the Arboricultural Association directory.

BALI registered members are vetted on quality and professionalism for landscaping and hard-landscaping work.

How to check: Search the BALI member directory.

Anyone removing waste (spoil, old paving) must be a registered waste carrier — otherwise your waste could be fly-tipped in your name.

How to check: Check the public waste-carrier register.

Membership of a kitchen/bathroom installer body signals vetted, accredited fitters with a code of practice.

How to check: Search the KBSA or BiKBBI member directory.

Any gas connection needs Gas Safe; any new electrical circuit needs a Part P competent person.

How to check: Check Gas Safe and the electrical scheme registers for the relevant sub-contractor.

The CAI, founded in 1978, is the UK's only trade association for aerial and satellite installers, recognised by broadcasters and government. Members are assessed against CAI Codes of Practice covering technical, commercial, and safety standards, must hold public liability insurance of at least £5,000,000, and must guarantee their installations for at least one year. Because the trade is entirely unregulated by law — anyone can trade as an aerial installer without any licence — CAI membership is the closest thing to an independent vetting standard that exists in this trade.

How to check: Search the CAI's free public installer directory at getmeviewing.org.uk by postcode. The listing shows the installer's name, location, and membership tier (standard or CAI Plus).

CAI Plus is a higher grade within CAI membership, requiring everything standard membership does plus: a valid Safe Working at Heights certificate (relevant for all roof and ladder work) and a Disclosure and Barring Service (DBS) criminal record check. Since 2006 all new CAI applicants must meet CAI Plus criteria, so most currently active members on the directory carry Plus status. The DBS check is a meaningful signal for a trade that regularly involves entering homes and working on rooftops.

How to check: CAI Plus status is labelled directly in the getmeviewing.org.uk search results alongside the installer's listing.

Any company that handles refrigerant in a fridge, fridge-freezer or wine cooler must hold a Defra-approved F-Gas company certificate; REFCOM issues the most widely held of these. If the job involves refrigerant handling, checking REFCOM registration is a meaningful quality and compliance signal. For most routine domestic fridge repairs (motor, thermostat, door seal) no refrigerant is touched and certification is not in play — but where a regas or sealed-system repair is involved, an uncertified firm is operating outside the regulatory framework.

How to check: Search the REFCOM public register by company name or postcode at refcom.org.uk/refcom-register

Operated by the Institute for White Goods Engineers, this is the only UK-wide voluntary register of trained domestic appliance engineers. Members hold recognised formal training (including CPD-accredited courses). There is no statutory competence register for this trade, so this is the strongest available engineering-competence signal for washing machine, dishwasher and oven repairs.

How to check: Search by engineer or business name and postcode via the public search tool at whitegoods-training-academy.co.uk/the-iwge/appliance-safe-register

Because there is no statutory competent-person scheme for appliance repair, Trading Standards-vetted membership is the strongest independent check available. Buy with Confidence covers England and Wales; Trusted Trader Scotland covers most Scottish councils. Both schemes verify insurance, trading history and consumer complaint handling before approving a trader.

How to check: England and Wales: search buywithconfidence.gov.uk by trade and postcode. Scotland: search trustedtrader.scot under 'Appliance Repairs'.

Only people on this statutory register are legally allowed to call themselves an architect in the UK. It is not a voluntary badge — using the title without registration is a criminal offence under the Architects Act 1997. The register covers roughly 39,000 practitioners and shows each person's registration number and current status.

How to check: Search by name at architects-register.org.uk — the register is free and public. Ask your architect for their ARB registration number and check it matches.

RIBA chartered status goes beyond the legal minimum. It requires completion of Part 1, Part 2 and Part 3 training (typically 7–8 years in total) plus ongoing CPD and ethics oversight. RIBA members also have access to the RIBA conciliation service if a dispute arises — useful on a large residential project. Not every competent architect holds it, but it is a meaningful quality signal above bare ARB registration.

How to check: Search the RIBA Find an Architect directory at find-an-architect.architecture.com — you can search by name, location or specialism and see chartered status.

Many residential projects — extensions, loft conversions, planning drawings — are handled by Chartered Architectural Technologists rather than architects. They cannot legally use the title 'architect', but MCIAT and FCIAT members are regulated professionals with a Royal Charter (granted 2005), their own code of conduct and mandatory professional indemnity insurance. For straightforward residential work they are a legitimate and often lower-cost alternative.

How to check: Search the CIAT member directory at architecturaltechnology.com/membership/find-a-member to confirm chartered status.

Membership (MCIAT or FCIAT) or a CIAT Chartered Practice listing means the person or firm has an accredited degree, at least three years of verified experience, passed a professional assessment, holds mandatory professional indemnity insurance, and completes ongoing CPD. Because the title 'architectural technologist' is unprotected in UK law, this is the only publicly verifiable proof that the person is genuinely qualified — anyone without it is self-declared.

How to check: Search the CIAT Chartered Practices directory at architecturaltechnology.com/online-directories/ciat-chartered-practices.html by practice name or postcode. For individual members, the GOV.UK Regulated Professions Register (regulated-professions.service.gov.uk) lists CIAT as the competent authority and links to CIAT's contact for verification.

The PCA is the authoritative UK trade body for structural waterproofing. Their Waterproofing Design Specialist (WDS) Register lists individuals who hold the CSSW (Certificated Surveyor in Structural Waterproofing) qualification — the de facto industry standard under BS 8102:2022, the British Standard governing how below-ground structures must be protected against water. Lenders and building surveyors ask for a BS 8102-compliant design sign-off on basement projects; PCA/CSSW membership is the recognised proxy. There is no statutory register for this trade, so this is the closest equivalent to a formal qualification check.

How to check: Search the public WDS Register on the PCA website by name or company name. Also check whether the contracting firm appears in the PCA Member Directory (company-level membership, distinct from the individual CSSW register).

The FMB is the largest UK builder trade body. Members are independently vetted for financial standing and quality before joining, must adhere to a code of practice, and have access to a deposit protection scheme (up to £10,000) — directly relevant when handing over a large upfront payment on a £50,000–£200,000+ project. FMB membership also provides access to independent dispute resolution if something goes wrong.

How to check: Search the FMB 'Find a Builder' directory at fmb.org.uk by company name or postcode to confirm current membership status.

The installer has been trading for at least 3 years, passed financial and health-and-safety checks, committed to a Code of Practice, and is contractually required as a condition of membership to comply with the child-safety standard BS EN 13120 — the legal product-safety requirement for internal blinds that has applied since February 2014. It is the only independent quality gate for this trade; there is no government register or statutory licensing equivalent.

How to check: Search the BBSA's public member directory at bbsa.org.uk/members-search/ by postcode or company name and confirm the installer appears.

The FMB independently vets members before they join — visiting their sites, checking their credit history, and confirming they hold public liability insurance. Unlike many trade schemes, you cannot simply pay to join. Annual renewal means their standing is checked regularly, not just once.

How to check: Search the FMB's public 'Find a Builder' directory at fmb.org.uk by postcode and trade (Bricklayer / Brickwork) to confirm current membership.

A CSCS Blue card (Skilled Worker) means the bricklayer has passed a formal NVQ Level 2 in Trowel Occupations (Bricklaying) and a health and safety test — the standard evidence of real trade training. A Gold card means NVQ Level 3 (advanced craft or supervisor). Cards expire every 5 years, so a current card confirms they are up to date.

How to check: Ask the bricklayer for their CSCS card number and check it on the free CSCS Smart Check tool at cscs.uk.com. The result shows the card type, the qualification it is based on, and the expiry date.

Since April 2024 every individual carrying out building inspector work in England must be on this statutory register; working without it is a criminal offence under the Building Safety Act 2022. The register also shows the class of work they are authorised to inspect — Class 2 covers standard dwellings and extensions; Class 3 covers more complex or higher-risk buildings. Always confirm your inspector appears here before paying a deposit. Note: this register covers England only; Wales has a separate devolved equivalent.

How to check: Search the public register free by name or organisation at register-building-inspector.service.gov.uk/public-register-england — no login needed.

RICS-regulated surveyors (AssocRICS, MRICS, FRICS) must hold professional indemnity insurance, complete ongoing training, and follow a disciplinary code. This is the most widely recognised credential for independent building surveyors and snagging inspectors who are not operating as a building control approver. If your inspector is not RICS-registered you should confirm their professional indemnity insurance separately.

How to check: Search by name or location on the RICS member database at rics.org/find-a-member — displays membership grade and regulated-firm status.

The RPSA is a specialist not-for-profit professional body for independent residential property and snagging surveyors. Membership confirms the surveyor follows published snagging standards and has been assessed for competence in residential inspections. Particularly relevant if you are commissioning a new-build snagging survey rather than a building regulations inspection.

How to check: Ask your surveyor for their RPSA membership number, then check it is active at rpsa.org.uk/property-buyers/verify-a-member — there is no public name or postcode directory; verification requires the membership number from the surveyor.

A FENSA or CERTASS registered installer can self-certify that their window or external door replacement work meets Building Regulations — you automatically receive a compliance certificate. If your installer is not registered with either scheme, you or the installer must notify your local building control authority separately and arrange an independent inspection. This matters when you sell: a buyer's solicitor will ask for the certificate.

How to check: Search by company name or postcode at fensa.org.uk or certass.co.uk — both have free public member-check tools.

Fire door installation is a life-safety task: an incorrectly hung fire door can fail to contain a fire. BWF Fire Door Alliance certified installers have completed specific training — typically City & Guilds L3 Award in Fire Door Safety or BM TRADA Q-Mark — that a general carpenter without specialist training will not hold. For fire-door work, this is the credible specialist standard in the UK.

How to check: Search the public installer finder at firedoors.bwf.org.uk by postcode.

Members (MIOC or FIOC) have passed recognised craft examinations or a rigorous competence interview — it is the closest thing carpentry has to a professional qualification body in the UK. Membership numbers are relatively small, so finding an IoC member is a positive signal rather than a baseline expectation. Particularly relevant for bespoke joinery, staircases, or heritage work where demonstrable craft skill matters most.

How to check: Search the public Find-a-Professional directory at instituteofcarpenters.com/find-a-professional by name or location.

The NCCA has been the UK's recognised trade body for carpet and upholstery cleaners since 1968. Members must complete verified training, hold at least £2 million public liability insurance that specifically covers damage caused by cleaning treatments (known as Treatment Risk cover), and follow a Code of Practice. There is no government licence for this trade, so NCCA membership is the closest thing to a meaningful quality gate.

How to check: Search the NCCA's public Trusted Local Cleaners directory by postcode at trustedlocalcleaners.ncca.co.uk and confirm the company name and member number appear.

TrustMark is the government-endorsed quality scheme. For carpet and upholstery cleaners, NCCA is the sole scheme operator — a cleaner can only hold TrustMark in this category if they are already an NCCA member who has additionally demonstrated at least two years' experience, passed spot-and-stain training, and maintained the required insurance. It is a harder gate than NCCA membership alone.

How to check: Search the TrustMark public register at trustmark.org.uk/find-a-tradesperson, filter by trade type, and confirm the trader's registration is active.

HETAS is the government-recognised body for solid fuel and biomass heating. An HETAS Approved Sweep has been trained and assessed to a defined standard, and the certificate they issue after each sweep is widely cited by home insurers and landlords as proof of a professional service. Many insurers require an annual certificate from an accredited professional to honour a claim after a chimney fire.

How to check: Search by postcode on the HETAS public register at hetas.co.uk/consumer/services/chimney-sweeps/ — look for your sweep's name or company under 'Chimney Sweeps'.

The oldest established chimney-sweep body in the UK, formed in 1982, with over 700 members. All new members must complete recognised training and on-site assessment, and must hold public liability insurance before joining. NACS members issue a certificate after every sweep. The body is recommended by the Solid Fuel Association, HETAS, and OFTEC.

How to check: Use the 'Find A Sweep' postcode search on the NACS website at nacs.org.uk/find-sweep/ to confirm your sweep is a current member.

A not-for-profit trade association established over 30 years ago whose members must pass a knowledge assessment conducted by qualified Guild assessors. Training includes a carbon monoxide protocol covering what a sweep should do if a CO incident is suspected. Members issue a certificate after each sweep and record whether a CO alarm is present.

How to check: Use the member search at findachimneysweep.co.uk — the Guild's dedicated sweep-finder — to confirm your sweep is a current member.

The only nationally recognised trade body dedicated to carpet, upholstery, hard flooring, and specialist fabric cleaning in the UK. Members must hold recognised training qualifications, carry public liability insurance, and abide by a Code of Practice that includes a complaints procedure. Membership is voluntary but meaningful — it is the one body that specifically vets carpet and upholstery cleaners rather than cleaners in general.

How to check: Search the NCCA's public Trusted Local Cleaners directory by postcode and service type at trustedlocalcleaners.ncca.co.uk — results show insured, trained members near you.

The main professional body for the UK cleaning industry, with over 79,000 members. Corporate members operate trained teams holding BICSc qualifications, which are regulated by Ofqual. Membership signals that a cleaning company invests in staff training and meets a recognised professional standard — particularly relevant for domestic cleaning agencies and commercial-domestic crossover operators.

How to check: Search the BICSc membership directory at bics.org.uk/membership-directory/ by company name, location, or sector to confirm a cleaning company holds corporate membership.

The contractor has been background-checked and vetted by their local Trading Standards team before being listed, and is re-audited periodically. This scheme exists specifically because driveways and paving are the UK's highest-risk doorstep-scam trade — a listing here is the strongest anti-rogue-trader signal available for this type of work.

How to check: Search by trade ('driveways', 'concreting', 'paving') and postcode at buywithconfidence.gov.uk to confirm the contractor is currently listed.

BALI Accredited Contractors have passed a pre-join site inspection and are subject to ongoing quality-standard reviews. BALI is the UK's principal trade body for landscaping and hard surfacing, including concrete driveways and patios. Membership is not open to all — it requires demonstrated workmanship and trading standards.

How to check: Use the landscape contractor directory at bali.org.uk to search by postcode and confirm the firm holds current Accredited Contractor status.

Relevant only if you are having pattern-imprinted (decorative/stamped) concrete laid. PICS is the UK's leading body for this specialist surface and has trained over 5,000 operatives. Accreditation means the installer has completed the formal two-day course on installation, surface preparation, and sealing — skills that cannot be judged by eye at the quote stage.

How to check: Find accredited installers by postcode using the installer-finder at picsuk.com.

The ECS issues occupational cards specifically for network infrastructure installers. The Level 3 Installer and Gold Card require completion of the Level 3 Network Cable Installer Apprenticeship Standard (or an Experienced Worker Assessment route introduced in August 2024), plus at least 12 months of documented installation experience and a current ECS Health, Safety and Environmental Assessment. Because there is no statutory register for this trade, an ECS card is the closest verifiable proof that an individual holds a recognised qualification rather than simply calling themselves a cable installer.

How to check: Ask the installer for their ECS card and use the public ECS Check tool at ecscard.org.uk/ecs-check-card-search — enter the name, card number, and expiry date to confirm the card is current and shows the Network Infrastructure category and card level.

CEDIA is the UK trade association for home technology integrators, covering structured cabling, home networking, AV, and smart-home systems. Member companies must carry minimum £1 million public liability insurance and agree to a Code of Ethics. CEDIA also offers specific installer certifications including the Cabling and Infrastructure Technician (CIT) qualification. Membership is most relevant when the data cabling job overlaps with AV or whole-home smart systems.

How to check: Search the public Find a Smart Home Professional directory at my.cedia.org/Connection/Directories/Find-a-Smart-Home-Professional — filter by location to confirm the company is a current CEDIA Integrator Member.

The CAI is the sole TrustMark scheme operator for the signal reception and home entertainment sector, which includes installers who do data cabling alongside aerial, satellite, and home networking work. CAI Plus members who hold TrustMark approval are audited by Trading Standards, are criminal-record checked, and carry required insurance. TrustMark is government-endorsed. This credential is most relevant for installers who combine TV, satellite, AV, and data cabling in a single job.

How to check: Search the CAI's consumer-facing installer directory at getmeviewing.org.uk, or search the TrustMark public directory at trustmark.org.uk (filter by signal reception or home entertainment trade type and postcode) to confirm the installer holds current CAI Plus and TrustMark approval.

The installer has been independently audited by BM TRADA-appointed inspectors for workmanship quality, not just product knowledge. TDCA is the UK's specialist trade body for decking and cladding; DeckMark Part 2 is the most specific independently verified quality credential for decking installation in the UK, renewed annually. Note: DeckMark currently covers timber and cladding installations; composite/WPC-only installers may not hold it.

How to check: Search the TDCA supplier directory at tdca.org.uk/suppliers and confirm the company name and location match the firm you are quoting with.

The only UK trade body dedicated to demolition. Every member must pass an in-person annual site audit on a live site and hold appropriate health-and-safety accreditation and specialist insurance. Membership is the single strongest trust signal for this trade.

How to check: Search the NFDC public contractor directory by company name or region — it shows membership status and compliance badges.

Any contractor removing demolition rubble must hold an Upper Tier waste carrier registration. If they don't, the rubble can be fly-tipped and you — as the property owner — can face Environment Agency fines even if you had no idea.

How to check: Search the Environment Agency's public waste carriers register by company name or registration number.

If your building was constructed or refurbished before 2000, it may contain asbestos. Only contractors holding an HSE licence may legally remove the highest-risk asbestos-containing materials. Unlicensed removal is a criminal offence and exposes you and your neighbours to serious health risk.

How to check: Check the HSE's published list of licensed asbestos contractors. NORAC also provides a searchable map of the same data at norac.org.uk.

The contractor has been independently audited by the drainage trade body against competency standards covering high-pressure jetting, CCTV surveys, excavation, and waste management. Membership is not self-declared — it requires an audit and can be withdrawn. This is the most meaningful drainage-specific credential a UK homeowner can check.

How to check: Search the public contractor directory at drainsafe.org by company name or postcode to confirm current approved status.

The business has been vetted by your local Trading Standards office, including a criminal-record check and inspection of trading practices. It is a council-backed consumer-protection scheme, not a paid-for logo. Drainage is one of the highest-risk trades for rogue traders and scams, so this approval carries real weight.

How to check: Search by trade ('drainage') and postcode at buywithconfidence.gov.uk to confirm the contractor is currently approved.

If the contractor is carrying out new self-lay connections to the public water or sewer network, all water companies require their self-lay providers to hold WIRS accreditation, administered by LRQA. Only relevant for new connections — not routine unblocking, jetting, or repair — but for that scope it signals a serious, compliance-audited operator. Not applicable to the typical emergency callout.

How to check: Search the public WIRS register at lrqa.com/en-gb/utilities/water-industry-registration-scheme-wirs-wirsae/search/ by company name to confirm accreditation.

The contractor has passed an independent site inspection, credit check, and insurance verification carried out by the FMB, and must renew annually to stay listed. It is the most widely used pre-vetting scheme specifically for UK builders and extension contractors, with around 8,000 members.

How to check: Search by postcode on the FMB 'Find a Builder' directory and confirm the company name matches exactly.

The contractor is registered with NHBC and can offer a 10-year structural warranty (Buildmark for new builds, MasterBond for conversions and larger extensions). Registration requires NHBC to have assessed the company's technical competence and financial standing — a meaningful pre-vetting step for substantial structural work.

How to check: Search the contractor's company name via the NHBC homeowner builder check at nhbc.co.uk.

The contractor has passed an annual health and safety audit covering risk assessments, method statements, insurance, and training. Under CDM 2015, on most extension projects the principal contractor takes on site safety duties that would otherwise fall to the homeowner — CHAS accreditation is evidence the contractor takes those duties seriously.

How to check: Use the free public verification lookup on chas.co.uk and enter the company name to confirm current accreditation.

Any engineer doing gas work (boiler service, gas appliance repair, gas pipework) must be Gas Safe registered by law. If a maintenance company offers gas work and cannot show a valid Gas Safe registration for their engineer, walk away — it is illegal and dangerous.

How to check: Search by company name, engineer name, or Gas Safe ID card number at the Gas Safe Register website. Ask to see the engineer's Gas Safe card on arrival and check the licence number matches.

In England and Wales, notifiable electrical work (consumer unit changes, new circuits, work in kitchens and bathrooms) must be carried out by a member of an approved competent-person scheme such as NICEIC, NAPIT, or ELECSA. Unregistered electrical work voids your home insurance, creates liability when you sell, and is a breach of Building Regulations. Note: in Scotland there is no equivalent self-certification regime — notifiable electrical work must be notified to the local authority Building Standards department instead.

How to check: Search by company name or postcode on the NICEIC installer finder, the NAPIT register (napit.org.uk), or the ELECSA find-a-contractor tool (elecsa.co.uk). Ask which scheme the company is registered with before they start electrical work.

TrustMark is the only government-endorsed scheme covering all home trades, including multi-trade maintenance operators. Members are assessed on technical competence, trading practices, and customer service, and must carry public liability insurance. Registration also gives access to Insurance-Backed Guarantees for deposits — important for ongoing maintenance contracts.

How to check: Search by postcode and trade category on the TrustMark website. The register is publicly searchable and shows current membership status.

The AFI is the UK's main trade body for fencing. Its Certified Contractor Scheme has four levels (General, Commercial, Major Projects, Specialist), each requiring evidence of training, insurance, turnover, and quality management. AFI is a TrustMark Scheme Provider, so CCS members can carry the government-endorsed TrustMark. Because there is no statutory register for fencing contractors, this is the most meaningful independent quality signal available.

How to check: Search the public AFI member directory at afiorg.uk by company name. The listing shows CCS level and membership status.

The company has been independently audited by a UKAS-accredited certification body (such as NSI, SSAIB, or BSI) against British Standard BS 5839 for fire detection and alarm systems. The register shows which modules they are certified for: Design, Installation, Commissioning, and/or Maintenance. Insurers, building control officers, and housing associations widely treat BAFE SP203-1 registration as the benchmark for competent fire alarm work. Note: unlike Gas Safe for gas, BAFE registration is industry-led and not a legal requirement for domestic installations in England — but it is the strongest available competency signal for this trade.

How to check: Search the free public BAFE Fire Safety Register at bafe.org.uk by postcode or company name, and check that the listing includes SP203-1 and the modules relevant to your job (at minimum Installation and Commissioning).

NSI is a UKAS-accredited independent body that audits and approves around 1,800 UK fire and security companies. NSI Gold means the company holds third-party certification against BS 5839; Silver means second-party inspection. Many insurers require NSI approval before they will cover a monitored fire alarm system, making this a meaningful signal even for domestic work.

How to check: Use the free NSI Company Finder at nsi.org.uk, filter by the Fire sector, and check that the listed approval covers your property type and the work you need.

SSAIB is a UKAS-accredited certification body that certifies companies against BS 5839 and related standards for fire detection and alarm systems. It is widely accepted by insurers alongside NSI, and is particularly common among smaller regional installers. A listed company has passed an independent audit of its design, installation, commissioning, and maintenance processes.

How to check: Search the free public supplier directory at ssaib.org, filter by fire detection, and confirm the company's certification scope covers the work you require.

The principal professional body for domestic flooring fitters since 1979. Members are graded — Fitter, Accredited Fitter, or Master Fitter — based on assessed competence. NICF only refers members to homeowners and requires them to work to a code of practice. Finding a graded member is the closest thing to a quality standard in a trade that has no licence requirement.

How to check: Search the public NICF directory by postcode or county at nicfltd.org.uk/NICF-Directory/ and confirm your fitter's name, location and grade appear.

The specialist trade body for wood flooring — covering hardwood, engineered wood, parquet and bamboo. Members must follow a code of conduct and the association runs NVQ and apprenticeship schemes. If you are having hardwood, parquet or engineered-wood floors fitted, a BWFA-registered contractor is a meaningful additional quality check beyond general review volume.

How to check: Use the public member-finder map at bwfa.co.uk/findmember — searchable by service type and location — and confirm your contractor appears.

A broader trade association covering contractors who install carpet, vinyl, LVT, rubber and timber floors in both domestic and commercial settings. Membership requires vetting and commitment to the association's standards. More common among larger or commercial-leaning firms, but relevant for domestic jobs too — particularly for LVT and commercial-grade vinyl.

How to check: Search the public CFA Flooring Directory at cfa.org.uk by region or postcode and confirm your contractor is listed.

The DHF is the only recognised UK trade body for garage door and automated gate installers. Members have passed a pre-membership site inspection, hold public and employer liability insurance, have completed DHF technical and safety training, and are bound by a minimum 2-year warranty and an independent dispute-resolution scheme. The GDHA (Association of Garage Door Specialists) was absorbed into the DHF — DHF is now the sole relevant industry body. Membership is voluntary, so its absence does not mean the trader is unqualified, but its presence is the strongest available third-party check in an otherwise unregulated trade.

How to check: Search the DHF public member directory by company name or postcode at dhfonline.org.uk/pg/members/ — results show company name, address, and registered product categories.

When a motorised garage door or electric gate is wired to the mains, the electrical installation falls under Part P of the Building Regulations in England and Wales. The installer must either be a registered self-certifying electrician (NICEIC, NAPIT, or ELECSA) or must notify the work to your local building control. If this is not done, the work is unregistered, your home insurance may be voided for electrical incidents, and you will face problems when selling the property. Note: Part P does not apply in Scotland (where the Scottish Technical Handbook Section 4.5 governs) or Northern Ireland (where District Council Building Control applies). Check this specifically if your job involves any motorised or automated system.

How to check: Search by company name or postcode on the NICEIC public register at niceic.com/find-a-contractor or the NAPIT register at napit.org.uk/find-a-registered-business.

Any gardener who removes green waste, soil, or garden rubbish from your property must hold a Waste Carrier Licence by law. Without it, your waste can be fly-tipped illegally — and as the householder who arranged its removal you could be prosecuted and fined (up to £400 for the householder; the carrier faces an unlimited fine). Lower Tier registration is free and covers green/garden waste only. The register is publicly searchable by business name.

How to check: Search the gardener's business name on the Environment Agency's public register at environment.data.gov.uk/public-register/view/search-waste-carriers-brokers. For Scottish gardeners check the SEPA register at www2.sepa.org.uk/wastecarriers.

APL is the only TrustMark-recognised scheme operator for landscaping and garden maintenance in the UK. Members must pass an annual on-site inspection of recent work, hold adequate insurance, and have been trading for at least two years. It is the strongest combined quality and accountability check for a garden professional beyond the waste licence.

How to check: Search by name or postcode on the APL's public directory at landscaper.org.uk/find-a-landscaping-professional.

BALI Accredited Contractor status requires an on-site assessment of the contractor's recent projects and ongoing compliance with quality standards. With over 900 vetted members it is one of the largest independent quality checks for garden and landscape businesses in the UK.

How to check: Search the BALI member directory by location or company name at bali.org.uk/members.

Groundworks produce large amounts of excavated soil, concrete, and rubble — all classified as controlled waste. The contractor must hold an upper-tier waste carrier licence to legally transport it. Without one, if they fly-tip your spoil, you as the homeowner can face an unlimited Environment Agency fine under duty-of-care rules.

How to check: Search the EA public register by company or trading name at environment.data.gov.uk — the result shows licence tier (upper/lower), current status, and expiry date. If the company does not appear, ask for their registration number before any digging starts.

Proves the operator driving the excavator, dumper, or compactor on your site is formally trained and assessed for that specific machine. Each card is category-specific and expiry-dated — a card for a dumper does not cover a 360 excavator. Operating plant without a valid CPCS or equivalent NPORS card is unsafe and may void the contractor's insurance, leaving you exposed.

How to check: Ask the contractor for the card number and the operator's surname, then check at cardchecker.nocn.org. The card checker confirms the category (e.g. 360 excavator, forward-tipping dumper) and expiry date.

A Blue CSCS card in Groundworking or Construction Operations confirms the operative has completed an NVQ/SVQ Level 2 in groundwork and passed the CITB Health, Safety and Environment test. It is the standard proof of formal trade training covering excavation, drainage, formwork, and concreting.

How to check: Ask for the card number and check it using CSCS Smart Check at cscssmartcheck.co.uk — the result shows the card type, occupation, and expiry. Blue = Skilled Worker (NVQ Level 2); a white Trainee or red Experienced Worker card indicates a lower level of assessed competence.

The UK's largest roofing trade body. Members are vetted and subject to triennial independent site inspections and a code of practice. Guttering, fascia, and soffit work is explicitly covered. Membership signals a real, established contractor — not a one-van cold-caller.

How to check: Search the public member directory on nfrc.co.uk by postcode or company name.

A government-authorised Competent Person Scheme covering England and Wales. Registered contractors can self-certify that roofline work (including guttering and fascias) meets Building Regulations without you needing a separate building control application. Registered work also carries an insurance-backed warranty. Does not apply in Scotland or Northern Ireland.

How to check: Check the public register at nfrccps.com by searching the contractor's name or postcode.

TrustMark is the UK government-backed quality scheme for home improvements. For insulation it carries particular weight: any installer doing work funded by ECO4 or the Great British Insulation Scheme is required to be TrustMark-registered. Registration means the installer has been independently assessed, holds the right insurance, and is subject to ongoing audits. TrustMark also publishes a public list of businesses suspended from trading — checking it takes seconds and can screen out known bad actors.

How to check: Search by company name and postcode at trustmark.org.uk/homeowner/find-a-tradesperson. Also check the suspensions list at trustmark.org.uk/homeowner/support/suspensions.

For cavity wall insulation in England and Wales, this is the UK government-approved competent person scheme. Registration gives the installer the right to self-certify the work under Building Regulations — meaning no separate building control application is needed. Installers on this register also back the 25-year guarantee that transfers to future buyers. If your installer is not registered, they must instead submit a building notice to your local authority; non-compliant work can complicate a future sale or remortgage.

How to check: Search the public installer list at theiaa.co.uk/installer-list or via cwisc.org (which redirects to the IAA site).

The BIID is the UK's only government-recognised professional institute for interior designers (Institute status granted by the Secretary of State in 2009). A Registered Interior Designer® has at least six years of combined education and work experience, has passed eight core competency assessments, and is required to hold professional indemnity and public liability insurance as a condition of membership. Note that 'interior designer' is not a legally protected title in the UK — this voluntary designation is the closest thing the trade has to a meaningful professional standard.

How to check: Search the public member directory at biid.org.uk/find-interior-designer by name or location. Look specifically for the 'Registered Interior Designer®' designation — not just general membership.

The SBID is the second main professional body for UK interior designers, with 600+ accredited members in its public directory. Accredited Designer status requires passing a competency framework assessment and commitment to continuing professional development. Membership requires professional indemnity insurance. Many designers belong to one body but not both, so it is worth checking both BIID and SBID directories.

How to check: Search the public designer directory at sbid.org/designer-directory/, filterable by specialism and location.

The UK's largest trade association for small and medium-sized building contractors. Members undergo an independent site inspection, insurance check, and financial vetting before joining, and must renew annually. FMB members can also arrange an Insurance-Backed Guarantee (IBG) that protects your stage payments if the firm folds mid-project — directly addressing the biggest loft-conversion risk.

How to check: Search the FMB Find a Builder directory by postcode. Confirm the firm's name and membership status appear before you pay any deposit.

A government-endorsed scheme for home improvement tradespeople. TrustMark firms are vetted through licensed scheme providers and must provide a minimum two-year financial protection policy covering workmanship. It also provides an independent consumer-complaint backstop if work falls short.

How to check: Search the TrustMark register by postcode and trade to confirm the firm appears as an active registered business.

The mechanic holds a current IMI Accreditation (ATA — Automotive Technician Accreditation), the UK's only nationally recognised voluntary competence standard for vehicle technicians. It requires a practical skills assessment and must be renewed every three years with evidence of ongoing training. There is no legal requirement to hold any qualification to repair cars in the UK, so this is the closest thing to a verifiable credential that exists for this trade.

How to check: Search the public IMI Professional Register by the mechanic's name, employer, or location at theimi.org.uk/membership/professional-register. The result shows accreditation level (Technician / Senior / Master) and whether it is current. No login is required.

The business has been vetted and approved by their local authority Trading Standards service. The vetting process includes a criminal record check, a full business audit, and a review of past complaint history. It directly addresses the homeowner's concern about having no comeback if a mobile mechanic disappears after shoddy work. Note: coverage varies by council — not all councils run the scheme, so absence does not mean the trader is untrustworthy. In Scotland the equivalent is the Trading Standards Trusted Trader scheme, coordinated by SCOTSS.

How to check: Search by business name or trade type at buywithconfidence.gov.uk. For Scotland, search at approvedtrader.scot, which covers 16+ Scottish councils.

The business is a member of the Independent Garage Association (IGA) and has signed up to a Consumer Code approved by the Chartered Trading Standards Institute (CTSI). Members are bound to a code of conduct, transparent pricing, and a free alternative dispute resolution (ADR) service. This scheme is primarily aimed at fixed-premises garages; a mobile mechanic who appears here is also an IGA member, which is itself a meaningful legitimacy signal. Absence from the scheme is not unusual for mobile operators and should not be held against them.

How to check: Search by postcode at trustmygarage.co.uk. Around 2,900 garages are registered. If a mobile mechanic appears here they hold IGA membership and are bound by the CTSI-approved code.

The UK's largest trade body specifically for this trade. Members must demonstrate experience and workmanship quality, hold public liability insurance, follow a Code of Practice, and give clients access to independent arbitration if something goes wrong. Membership is the single most meaningful credential for a painter or decorator.

How to check: Search the public "Find a Decorator" directory on the PDA website by name or postcode.

A cross-trade vetting body that runs up to 28 checks on applicants including spot-checks on actual work, references, and reviews before granting membership. Provides a searchable public directory. Less dominant than the PDA for this trade but still an independently verified signal.

How to check: Search the "Find a Craftsman" directory on the Guild website by trade and postcode.

The authoritative trade body in Scotland, representing around 75% of commercial and domestic painting and decorating work there. Members must employ SVQ Level 3 trained staff, provide two customer references, and pass a site inspection. Strongest credential signal for decorators based in Scotland.

How to check: Search the membership directory on the SDF website.

MRTPI is the only formal credential that distinguishes a qualified town planner from someone who simply calls themselves a planning consultant. "Planning consultant" is an entirely unprotected title in the UK — anyone can use it regardless of training. Chartered Members must hold an RTPI-accredited planning degree, pass an Assessment of Professional Competence, maintain continuing professional development, and carry Professional Indemnity Insurance under the RTPI Code of Professional Conduct. Without MRTPI, there is no mandatory insurance requirement, no professional ethics obligation, and no recourse body if things go wrong.

How to check: Search the RTPI Directory of Planning Consultants at rtpi.org.uk/need-planning-advice/directory-of-planning-consultants/ by name or location — it lists Chartered Members and Legal Associates who have opted in to be publicly found. Not all members choose to appear, so a name absent from the directory does not confirm non-membership. You can call RTPI directly on 0370 774 9494 to confirm whether a specific named individual is a current member.

The plasterer has been assessed on their workmanship at a British Gypsum training academy, has at least 5 years' experience, and holds current public liability insurance. British Gypsum backs the work with a 2-year workmanship guarantee — the closest thing to an independent quality standard that exists for mainstream plastering in the UK.

How to check: Search the official British Gypsum 'Find a Certified Plasterer' directory by postcode and confirm the plasterer's name appears.

The plasterer has been trading for at least a year, carries the right insurance, passed an independent site inspection, and is bound by the FMB's code of practice with access to independent dispute resolution if things go wrong.

How to check: Use the FMB 'Find a Builder' search — filter by 'plasterer' and your postcode — and confirm the firm's membership status is current.

A Blue Skilled Worker card means the plasterer has passed an NVQ Level 2 in plastering assessed on real work, plus the CITB health and safety test. A Gold Advanced Craft card indicates NVQ Level 3. This is the industry-standard proof that their skill has been formally assessed — not just self-declared.

How to check: Ask to see the physical card (name, card type, and expiry are printed on it). The CSCS website has an online card checker where you can verify a card number against a surname.

The title 'Chartered Surveyor' is legally protected in the UK — only people who have passed RICS-assessed competencies can use it. An MRICS or FRICS quantity surveyor must carry professional indemnity insurance (including run-off cover if they stop trading), follow a code of conduct, and give you access to a formal complaints and dispute resolution process. An unqualified 'QS' or 'estimator' has none of these obligations. Many self-build mortgage lenders will only accept stage-payment valuations signed by an MRICS professional.

How to check: Search by name at rics.org/find-a-member — you can check their grade (AssocRICS, MRICS, or FRICS) and confirm their membership is currently active.

A firm can be regulated by RICS as a business, separately from individual membership. A RICS-regulated firm must have a complaints-handling procedure, access to an approved dispute resolution scheme (such as the Property Ombudsman), and a client money protection arrangement. This matters because it gives you a route to redress against the company itself — not just an individual surveyor who may have since left.

How to check: Search the firm's name at ricsfirms.com and look for the 'RICS Regulated' badge on their firm profile. You can also filter by 'Quantity Surveying' as a specialty.

BAR members follow a Trading Standards-approved Code of Practice and, crucially, offer an Advance Payment Guarantee — if the company goes bust before your move, your deposit is protected. Members are audited annually and must carry adequate goods-in-transit insurance.

How to check: Search by company name or postcode on the BAR public member directory.

NGRS members are inspected under the RIOS (Removals Industry Ombudsman Scheme) programme. If something goes wrong, you can take a dispute to an independent ombudsman whose ruling is binding on the company — free of charge to you.

How to check: Search by postcode on the NGRS public member directory.

AIM is a not-for-profit body for smaller, independent removal firms. Members follow a Code of Practice and are enrolled in a free Alternative Dispute Resolution scheme, giving you a formal complaints route if things go wrong.

How to check: Search the AIM public member directory by name or location.

The UK's national trade body for scaffolding companies, founded in 1945, representing around 800 firms covering roughly 80% of contracted scaffolding. Member firms are audited every year against a Code of Practice, must ensure the majority of their workforce holds valid CISRS competence cards, and must carry adequate public liability insurance. There is no government licence to check for scaffolders, so NASC membership is the closest equivalent to a quality mark for a scaffolding company.

How to check: Search the public member directory on the NASC website by company name or postcode.

The industry-standard competence card for individual scaffolders, issued by NOCN. Cards are tiered — Trainee, Scaffolder, Advanced Scaffolder, Supervisor, Manager, Inspector, and System Scaffolding — so you can see exactly what level the person erecting your scaffold actually holds. NASC member firms are required to have the majority of their operatives on valid, unexpired CISRS cards. Asking what proportion of a firm's crew holds current CISRS cards is one of the best questions a homeowner can ask.

How to check: Check a card number via the public NOCN card checker online, or tap the NFC chip on the physical card with a smartphone. You need two of: surname, card number, National Insurance number, or date of birth.

The installer is independently audited to UKAS standards and approved to install alarms to the British Standards (BS EN 50131 / PD 6662) that police forces and most home insurers require. Only NSI or SSAIB-approved installers can register you for a police Unique Reference Number (URN), which is what gets police to respond to your alarm. Most home insurers require NSI or SSAIB accreditation as a policy condition — an unaccredited installer can silently void your cover.

How to check: Search by company name or postcode on the NSI Company Finder at nsi.org.uk/company-finder/ — this shows approval level (Gold, Silver, or Bronze), which services the approval covers (intruder alarm, CCTV, access control), and current status.

SSAIB is the other UKAS-accredited certification body recognised by police and insurers alongside NSI. SSAIB-certified installers meet the same British Standards as NSI and can register your system for a police URN. Many companies hold both NSI and SSAIB approval; either one is sufficient for police response eligibility and insurer recognition.

How to check: Search by company name, sector (intruder, CCTV, access control, fire), and postcode on the SSAIB supplier search at ssaib.org/search-suppliers/ — this shows the certificate scope and current status.

If the installer also covers fire detection and fire alarms (not just intruder alarms or CCTV), BAFE registration under scheme SP203-1 means a third party has independently certified that fire detection and alarm work. Relevant for combined security-and-fire installers; less critical if you only need an intruder alarm or CCTV.

How to check: Search by company name or postcode on the BAFE Fire Safety Register — select scheme type SP203-1 (Fire Detection and Fire Alarm Systems) to filter for certified fire-alarm installers.

CEDIA is the dedicated trade body for smart home and home technology professionals. All member tiers require proof of general liability insurance and agreement to a code of ethics; Professional and Premium members also gain a listing in the public Find a Smart Home Professional directory. There is no government-backed register for this trade, so CEDIA membership is the closest thing to a meaningful quality standard the sector has.

How to check: Search the public Find a Smart Home Professional directory at my.cedia.org — look up the company name and check which membership tier they hold (Professional or Premium members appear in the directory; a Starter member will not).

Almost all smart home installations involve mains electrical work — adding lighting circuits, new consumer unit connections, or EV charger wiring. In England and Wales this is notifiable under Building Regulations. A Part P registered installer can legally self-certify that work complies; an unregistered one cannot, meaning the work may be unsigned-off and a problem when you sell. Note: Part P self-certification does not apply in Scotland or Northern Ireland, where Building Control oversight is required instead.

How to check: Check the national Electrical Competent Person register at electricalcompetentperson.co.uk — enter the company name or postcode to confirm active registration under a current scheme (NICEIC or NAPIT).

KNX is an open, internationally standardised building-control protocol. All members of the KNX UK directory have KNX certification and adhere to the KNX UK code of conduct. Choosing a KNX-certified installer reduces the risk of vendor lock-in — your system can be maintained or extended by any other KNX-certified firm, not just the original installer.

How to check: Search the public integrator directory at knxuk.org — filter by UK region to find certified firms near you.

The fabricator has been independently assessed each year for safety standards, technical competence, UKCA compliance, and insurance, and is listed on the UK steelwork industry's main quality register. This register targets structural and commercial steelwork contractors — if your project involves a load-bearing beam, structural frame, or large-scale steelwork, it is the most meaningful vetting signal available. Most small residential fabricators making gates or railings will not appear here.

How to check: Search the public directory at bcsa.org.uk/member-directories/rqsc-buildings/ by location and building type. Results show each member's accreditations, contract value bands, and profile.

For any load-bearing steelwork — a new beam, structural frame, or lintel — the fabricator must hold BS EN 1090 / UKCA certification under UK law. This requires a UKAS-accredited body to audit the fabricator's workshop processes, welding quality control, and material traceability. Without it, structural steel placed in your home has not been verified against the mandatory safety standard. It does not apply to purely decorative work such as gates or railings below structural thresholds.

How to check: Ask the fabricator for their current EN 1090 certificate from a UKAS-accredited body. The certificate should state their Execution Class (EXC1–EXC4) and be in date. One UKAS-accredited body, SCCS (Specialist Construction Certification Scheme), offers a free public certificate checker by company name at construction-certification.com/certification-check.

The operator has joined the principal UK self-storage trade body, which covers over 80% of UK facilities. Members follow a published Membership Standard covering security, customer contracts, and fair pricing. This is the closest thing to a quality mark in a sector with no government licensing — membership is voluntary, not legally required.

How to check: Search the SSA UK facility finder by postcode or company name at ssauk.com to confirm the operator is a current member.

Relevant when the company also handles moving or collects your goods (removal-and-storage operators), not pure self-storage facilities. BAR is the only CTSI (Trading Standards)-approved code holder for the removals and storage sector. Members are audited annually and must hold an Advance Payment Guarantee, which protects your deposit if the company goes bust before your move.

How to check: Search the BAR member directory at bar.co.uk/find-a-member by company name or location and confirm that 'storage' is listed among their services.

A HETAS-registered installer can self-certify your stove installation against Building Regulations (Part J) without you needing a separate local authority inspection. They issue the Certificate of Compliance that your home insurer expects and that a buyer's solicitor will ask for when you sell. Registration also means they have been assessed on solid-fuel safety competence — incorrect installation is a carbon monoxide risk. Note: there is no legal requirement to use a HETAS-registered installer (an unregistered installer can instead apply for a council building control inspection), but HETAS self-certification is by far the simpler, faster route to the certificate you need.

How to check: Search the public installer directory by postcode or 4-digit company ID at hetas.co.uk/find-installer. Check the registration is current (status shown in results) and note which categories are listed — some cover stove installation only, others include chimney and flue work.

OFTEC solid-fuel registration carries the same legal standing as HETAS for Building Regulations self-certification under Approved Document J. Relevant mainly for heating engineers who also fit stoves. If your installer holds OFTEC solid-fuel registration instead of HETAS, they can still issue a valid Certificate of Compliance — the two schemes are legally equivalent for this purpose.

How to check: Use the public technician search at oftec.org, filter by solid fuel. Confirm the registration is active and that the scope covers solid fuel appliance installation, not just oil.

The engineer has passed IStructE's professional review, demonstrating competence in structural design and calculation. IStructE's code of conduct requires members to hold professional indemnity insurance (though PI is not a statutory legal requirement). This is the most widely recognised qualification for residential structural work such as wall removals, loft conversions, and extensions — and the single most useful credential to check in the absence of statutory licensing for this trade.

How to check: Search the public members directory at istructe.org/find-an-engineer/members-directory — enter the engineer's name and confirm their membership grade is MIStructE, AMIStructE, or FIStructE.

Some structural engineers hold ICE membership rather than IStructE, particularly those from a civil engineering background. MICE or FICE combined with Chartered Engineer (CEng) status is an equally credible route. The key check is that they hold a chartered grade — not just an affiliate, associate, or student grade — and that CEng is registered through the Engineering Council.

How to check: Use the ICE member directory at ice.org.uk — search by name and confirm the membership grade is MICE or FICE and that Chartered Engineer (CEng) status is shown.

The Engineering Council is the UK licensing authority that awards the protected titles Chartered Engineer (CEng) and Incorporated Engineer (IEng). IStructE and ICE memberships both feed into this register. Checking here confirms the engineer's title is currently registered and that their institution membership is in good standing. CEng is the stronger indicator for structural work; IEng denotes a recognised but lower level of qualification.

How to check: Search the Engineering Council's online register at engc.org.uk — enter the engineer's name to confirm their CEng or IEng status and the institution they are registered through.

The firm is regulated by RICS, which requires it to hold professional indemnity insurance, follow enforceable professional rules, and offer access to RICS dispute resolution if something goes wrong. A surveyor with MRICS or FRICS after their name, or a firm listed as "Regulated by RICS", has met the recognised professional standard. Note that the title "surveyor" is not legally protected in the UK — only "Chartered Surveyor" is — so RICS membership is the most important single check for this trade.

How to check: Search for the firm at ricsfirms.com or look up the individual surveyor at rics.org/find-a-member. The firm directory shows regulated status, address, and specialisms; the member directory shows grade (MRICS/FRICS) and active membership status.

The RPSA is a professional body for independent residential surveyors, with a focus on home surveys. Members must hold professional indemnity insurance. A useful check for surveyors specialising in pre-purchase home surveys, whether or not they also hold RICS membership.

How to check: Ask the surveyor for their RPSA membership number and enter it at rpsa.org.uk/Property-Buyers/Verify-A-Member to confirm active membership.

The specialist credential for damp, timber and structural waterproofing surveys. PCA members must hold professional indemnity insurance and commit to a code of practice. Critically, PCA members are categorised as either independent surveyors or remediation contractors — if the same company doing your damp survey also sells the remediation work, that is a conflict of interest. Checking PCA membership and member type helps you distinguish independent advice from a contractor-driven report.

How to check: Search for the firm by postcode at property-care.org using their public member finder. Check the member type (independent surveyor vs contractor) when assessing impartiality.

SPATA is the main trade body for UK pool builders and has vetted its members since the 1960s. Members must meet British and European standards, sign a code of ethics, and carry adequate insurance. Because there is no government licence for this trade, SPATA membership is the closest independent check that a pool company knows what it is doing.

How to check: Search the public directory at spata.co.uk/find-a-member — filter by postcode and specialism (Pool Builder, Service Engineer, or Retailer) to confirm the company is a current member.

BISHTA is the specialist trade body for hot tub and spa pool installers. Members are vetted, must follow a code of practice, and receive water-hygiene training — important because poorly commissioned hot tubs can harbour Legionella. Only current members are permitted to display the BISHTA logo, so the directory is the definitive check.

How to check: Search the public map at bishta.co.uk/find-a-member — enter your postcode to see current members near you and confirm whether the company is listed as a retailer, service engineer, or manufacturer.

The TTA is the UK's only trade body specific to tiling. Members are vetted for financial standing, technical competence and service standards before they can join and display the TTA mark. Some members hold a 'Master Tiler' designation, which signals a higher level of assessed skill. Because tiling is unregulated, TTA membership is the strongest single quality signal available for this trade.

How to check: Search the TTA's public Find a Tiler directory by location at tiles.org.uk/directory/find-a-tiler-by-location and confirm the trader's name and business appear in the listing.

A blue CSCS (Construction Skills Certification Scheme) card held by a tiler shows they have passed an NVQ Level 2 Diploma in Wall and Floor Tiling — a formal, regulated qualification assessed by City & Guilds, ProQual or Pearson. Because there is no legal requirement to qualify, many working tilers do not hold one, making this a meaningful differentiator.

How to check: Ask the tiler for their CSCS card and verify the card number is valid and current using CSCS Smart Check at cscs.uk.com/checkcards.

Anyone paid to carry someone else's waste in England must hold an upper-tier Environment Agency waste carrier licence. Without it, carrying your waste is illegal — and if they dump it, the law can hold you (the homeowner) jointly responsible, with fixed penalty notices of up to £600. An upper-tier licence requires an active application and periodic renewal, so it is a live, current check.

How to check: Search the public register by company name or registration number at environment.data.gov.uk. You should see the registration number, expiry date, and licence tier (upper-tier is what you need). If the trader is not on the register, do not hire them.

In Scotland, waste carriers register with SEPA rather than the EA. The legal duty of care is identical — you remain liable if an unlicensed Scottish carrier fly-tips your waste. Check this register instead of (or in addition to) the EA one if your contractor operates in Scotland.

How to check: Search the SEPA public register by company name or postcode at sepa.org.uk/wastecarriers.

Buy With Confidence is a Trading Standards scheme that approves traders only after a criminal records check and a full Trading Standards audit. Waste clearance firms are listed. It adds a layer of consumer protection beyond the carrier licence — including access to a complaints process — and is run by local authorities, not a trade body.

How to check: Search the public directory by trader name or postcode at buywithconfidence.gov.uk.

If a welder is supplying or installing structural steel components — lintels, RSJ splices, balustrade posts, structural frames — the fabricator is legally required under UK product regulation (UKCA marking, formerly CE-marked EN 1090, mandatory in Great Britain since July 2014) to hold a Factory Production Control certificate. This means their welding processes, welder qualifications, and quality management system have been audited by a UKAS-accredited body. An uncertified fabricator supplying structural steel is non-compliant. This is the strongest credential to check for any structural welding job.

How to check: Search the free public directory at 1090register.com by company name or location. The listing shows the company's execution class, certifying body, and certification number. If the fabricator does not appear, ask for their certificate and certifying body directly.

CSWIP is the UK's leading independent welding qualification scheme, run by TWI Certification Ltd (UKAS-accredited to ISO/IEC 17024). A CSWIP 3.1 Welding Inspector has passed a rigorous exam and practical test; coded welders under the CSWIP scheme have been tested to a specific welding process, material, and position. Certificates are time-limited and must be renewed. Holding a CSWIP qualification — whether as an inspector or a coded welder — demonstrates the person operates in the professional, tested market, not the uncertified hobbyist tier. Around 60,000 certificate holders are registered.

How to check: Ask the welder for their CSWIP certificate number and date of birth, then check at the official verification page: cswip.com/verification. The form confirms whether the certificate is current and what scope it covers.

If they trade as a limited company, confirm it is active (not dissolved or in liquidation) and how long it has traded. Note: being registered is NOT a quality credential on its own — every company has it.

How to check: Search the company on the official Companies House register.

Cover (typically £1m+) that protects you if the trader damages your property or a third party. Ask to see the certificate.

How to check: Ask for the insurance certificate and check it is in date and covers the work.

TrustMark is a government-endorsed quality scheme spanning many trades, requiring vetting and a customer-protection commitment.

How to check: Search the firm on the TrustMark find-a-tradesperson tool.