Quick Answer
In 2026, general builders in the UK are not required by law to hold any registration. However, specific types of work — gas, electrical, oil heating, solid fuel, and asbestos removal — require legally mandatory certifications. For general building work, voluntary schemes like TrustMark and the FMB are the best quality indicators.
When you hire a builder in 2026, one of the first questions you might ask is whether they need to be on an official register. The answer depends entirely on what type of work they are doing. UK law is surprisingly permissive about general building work — but very strict about specific regulated trades within the construction industry.
In this guide
No Mandatory Registration for General Builders
Unlike some European countries, the UK has no overarching licensing system for general builders. A person can legally work as a builder without holding any formal qualifications, completing any training, or registering with any body. This is a deliberate policy choice — the construction industry is large and varied, and Parliament has resisted calls for mandatory licensing for general building work.
This does not mean there are no quality standards. It means the burden is on the homeowner to do their due diligence. The good news is that there are excellent voluntary schemes and legally mandatory requirements for the most dangerous specialisms — and knowing the difference protects you.
For guidance on finding and evaluating a builder, see our full guide on how to hire a builder in the UK.
Voluntary Quality Schemes: FMB and TrustMark
Even though registration is not mandatory for general builders, two voluntary schemes are widely recognised as quality indicators:
Federation of Master Builders (FMB)
The UK's largest trade association for the construction industry. FMB members are independently inspected and must meet standards for technical competence, financial stability, and customer service. They also have access to dispute resolution if things go wrong. Membership is not mandatory but is a respected quality mark. Visit fmb.org.uk to search for members.
TrustMark
A government-endorsed quality scheme administered by the Department for Energy Security and Net Zero (DESNZ). TrustMark covers builders, plumbers, electricians, heating engineers, and more. Businesses must pass technical inspections, financial checks, and customer service assessments. For work funded through government energy efficiency schemes, TrustMark registration is often a formal requirement.
Competent Person Schemes for Regulated Work
For specific types of building-related work, the UK operates a system called “Competent Person Schemes.” These allow tradespeople who are registered with an approved scheme to self-certify their work as complying with Building Regulations — without the homeowner needing to separately notify the local authority building control.
The key schemes include:
- NICEIC / NAPIT / Elecsa (Part P): For electrical work, covering new circuits, consumer unit replacements, and bathroom electrical work
- Gas Safe Register: For all gas work — legally mandatory, not voluntary
- OFTEC: For oil-fired heating systems
- HETAS: For solid fuel heating systems including wood-burning stoves
- FENSA / CERTASS: For replacement windows and doors — allows self-certification under Building Regulations
- MCS: For microgeneration — solar panels, heat pumps, required for connection to the grid and subsidy schemes
For more detail on checking qualifications, see: how to check if a tradesperson is qualified in the UK.
When Registration Is Legally Required
For these types of work, using an unregistered person is a criminal offence or creates serious legal and financial liability:
- Any gas work: Must be Gas Safe registered. This includes boilers, gas hobs, gas fires, and gas pipe work.
- Notifiable electrical work (Part P): Must be carried out or certified by a registered electrician — or formally notified to the local authority building control. See our guide on Part P electrical regulations.
- Notifiable building work: Extensions, loft conversions, new buildings, and certain structural alterations require Building Regulations approval via your local authority. Your builder should handle this — but confirm it in writing. See our building regulations guide for homeowners.
- Asbestos removal (high-risk ACMs): Only HSE-licensed contractors can legally remove certain categories of asbestos-containing materials.
Type of Work: Registration Requirements at a Glance
| Type of Work | Registration / Certification | Notes |
|---|---|---|
| General building work (extensions, conversions) | No mandatory registration | FMB or TrustMark membership recommended |
| Gas installation or servicing | Gas Safe Register (legally required) | Criminal offence to do without registration |
| Electrical work (new circuits, consumer units) | Part P registered (NICEIC, NAPIT, etc.) | Notifiable work — must be certified |
| Electrical work in bathrooms | Part P registered electrician | Zone 1/2 work is always notifiable |
| Oil heating installation | OFTEC registered | Required for Building Regulations compliance |
| Solid fuel appliances | HETAS registered | Required for Building Regulations compliance |
| Cavity wall insulation | Cavity Insulation Guarantee Agency (CIGA) | Required for warranty and compliance |
| Asbestos removal (high-risk materials) | HSE Licensed Contractor | Legally required — criminal offence otherwise |
| Microgeneration (solar panels, heat pumps) | MCS certified | Required for grid connection and subsidies |
| Underpinning / structural repair | Structural engineer specification required | Building Regulations approval needed |
Frequently Asked Questions
Is there a mandatory builders' register in the UK?+
No. Unlike gas engineers or electricians, general builders are not required by law to hold any registration or qualification. Anyone can legally call themselves a builder and carry out general building work. This is why checking voluntary schemes like FMB, TrustMark, or Which? Trusted Traders is so important when hiring a builder.
What is TrustMark and should I look for it?+
TrustMark is a government-endorsed quality scheme covering trades including building, plumbing, electrical, and heating. Businesses must pass checks covering technical competence, customer service, and trading practices. For work funded through government schemes (like the Great British Insulation Scheme), TrustMark registration is often a requirement.
What is the Federation of Master Builders (FMB)?+
The FMB is the UK's largest trade association for builders. Members are independently inspected and must meet quality and competence standards. FMB membership is a useful marker of a professional, accountable builder — though it is not legally required and many excellent builders are not members.
What happens if a builder does notifiable work without certification?+
For work like electrical or gas installations, uncertified work is illegal. For broader building work that requires Building Regulations approval (like extensions), the local authority can require the work to be opened up, inspected, and potentially demolished if it does not comply. This can also block a property sale.
How do I check if a builder is legitimate before hiring?+
Check their FMB or TrustMark membership, ask for their public liability insurance certificate, check online reviews, ask for examples of previous work with references, and get a written contract. Our full guide covershow to hire a builder in the UK.
Do I need Building Regulations approval for an extension?+
Most extensions require Building Regulations approval, even if they don't need planning permission. The regulations cover structural stability, thermal performance, drainage, and fire safety. Your builder should handle the application — but confirm this is included in your contract.
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