Can an installer be prosecuted for falsely claiming to be registered?

The offence routes differ by trade. In Northern Ireland, any person who knowingly or recklessly gives a notice, certificate or makes an application containing a false or misleading statement is guilty of an offence under the Building Regulation (NI) 2000 as amended³. In grant-funded work, a knowingly false declaration is a criminal offence punishable by a fine, imprisonment or both⁴. And the consequences of unapproved work fall on the householder as well as the installer: unauthorised works are illegal, leave both parties liable to prosecution by the council, may prejudice a sale or remortgage, and may have to be regularised by building control⁵.

What "registered" means: Gas Safe, competent person schemes and MCS

Registration is not one thing. It is a set of separate registers, each covering a trade or a type of work, and a claim to be "registered" means nothing until the register is named.

For gas, the position is statutory. Gas installation businesses must be registered with Gas Safe Register, and the register requires National Insurance numbers for any engineers being registered⁸. For most other domestic work, registration runs through competent person schemes. An installer, for example of windows or boilers, who is registered with a scheme can self-certify that their work complies with building standards⁹. That self-certification route is the practical benefit of registration: it removes the need to involve local authority building control.

The scheme landscape is trade-specific. Gas boilers require an installer who is Gas Safe Registered from 1 April 2009; oil fired boilers and solid fuel fired boilers require an installer registered with the Competent Person Schemes¹⁰. Electricians become registered with an approved self certification organisation¹¹. For installing mechanical ventilation and air conditioning systems in dwellings there are currently four registered competent person schemes: BESCA, Blue Flame Certification, Certsure and Napit¹². Windows and doors sit with FENSA or CERTASS, whose registered installers are assessed against Building Regulations standards and authorised to self-certify that their work is compliant¹³.

Renewable and funded work adds a further layer. Under the Warm Home Discount (England and Wales) Regulations 2026, a boiler or central heating system must be installed by, or under the responsibility of, a person registered with TrustMark, with a certificate of lodgement issued by the operator of TrustMark¹⁴. Green Homes Wales loan rules require the installer to be Registered, meaning registered with TrustMark and the relevant body for the relevant type of eligible measure, and to comply with relevant PAS certification¹⁵.

Is falsely claiming registration a criminal offence?

It can be, through several distinct routes, and which one applies depends on what was claimed and where.

The first is the false statement route. In Northern Ireland, knowingly or recklessly giving a notice, certificate or application containing a false or misleading statement is an offence under the Building Regulation (NI) 2000 as amended³. The wording matters: it catches the reckless claim as well as the knowing one, so an installer who did not bother to check their own registration status is not automatically outside it.

The second is the false declaration route in funded schemes. Scheme rules state that it is a criminal offence to knowingly make a false declaration, punishable by a fine, imprisonment or both⁴. Grant schemes also carry their own contractual consequences: a grant offer letter may be cancelled and payment withheld where eligibility requirements were not met, the installer has ceased to be Registered, false statements or fraud were made, or there was inappropriate collusion¹⁵.

The third is the misuse of a scheme's mark. HETAS has pursued a case in which the main complaint was that an installer was claiming to be registered with the Heating Equipment Testing and Approved Scheme when he was not¹⁶. HETAS Registered Installers are trained and assessed to carry out installations safely and in line with relevant regulations, so the claim is a statement about competence, not just about paperwork¹⁷.

Who prosecutes: Trading Standards, HSE and the schemes themselves

Enforcement is split, and the split follows the type of harm.

Local authority building control and trading standards carry the general enforcement of building regulations and consumer protection. The consequence of unapproved work is framed in those terms: unauthorised works leave the householder and the installer liable to prosecution by the Council⁵. Where a false claim is a trading practice rather than a building control matter, it is the trading standards service of the local authority that acts.

The Health and Safety Executive has the gas safety interest. Gas work is restricted by law to engineers on the register holding current qualifications¹, and the HSE publishes guidance for homeowners on gas safety in the home⁶. Unsafe gas work is a safety matter before it is a paperwork matter.

The schemes themselves act on misuse of their own marks and on the conduct of their members. HETAS investigates and publicises rogue installer cases, including false registration claims¹⁶. For Boiler Upgrade Scheme work, complaints about installation quality, workmanship or installer behaviour go first to the installer, then to the installer's consumer code, HIES or RECC, or to MCS installation quality complaints¹⁸. If that is not resolved, the MCS Administrator can advise how to make a complaint about an MCS installer¹⁹. MCS has managed complaints in-house since 10 September 2026 and provides alternative dispute resolution where parties cannot reach a resolution.

How to check whether an installer is genuinely registered

Checking is free and takes minutes. Gas Safe Register runs a freephone helpline on 0800 408 5500 and a public website where an engineer's registration can be checked⁶. That single call resolves the most consequential claim, because gas registration is a legal requirement rather than a voluntary badge¹.

For other trades, the check is against the relevant scheme register. Independent guidance is direct on windows: choose an installer registered to a competent person scheme to make sure windows are fitted to building regulations²⁰. The same logic applies to boilers, where the installer should be registered under an approved scheme¹⁰, and to cavity wall insulation, where an installer registered with The Cavity Insulation Guarantee Agency will in most cases submit the building notice²¹.

TrustMark is the government-endorsed competent person register for finding an installer that will assess your circumstances and property to identify suitable measures²². For funded work it is not optional: Green Homes Wales rules require registration with TrustMark and the relevant body for the measure, plus relevant PAS certification¹⁵.

Two practical points. First, ask which register, then check that register, not a logo on a van. Second, registration is not the same as competence for the specific job: a registered installer with the relevant competencies can self-certify gas appliance work without close involvement of building control, and the phrase "relevant competencies" is doing real work in that sentence²³.

What to do if you suspect a false claim

The order of action matters, because some routes depend on the others having been tried.

Start with the register. Confirm whether the installer holds the registration claimed, using the Gas Safe helpline or the relevant scheme's public search⁶. A confirmed absence turns a suspicion into a documented fact.

Then report to the body that owns the claim. Misuse of the Gas Safe mark goes to Gas Safe Register; misuse of the HETAS mark goes to HETAS, which has acted on exactly this kind of case¹⁶. Where the work was funded, the scheme administrator has its own interest: grant rules allow cancellation and withholding of payment where the installer has ceased to be Registered or false statements were made¹⁵.

For faulty installations under ECO4 and the Great British Insulation Scheme, official guidance sets out the escalation: families affected should first contact the installer who carried out the installation, and where the installer is no longer trading or unable to remedy damages, they can contact their guarantee provider to initiate a claim²⁴. That two-step structure, installer first, guarantee provider second, recurs across funded work.

If the work is already done: your remedies and safety risks

Once unregistered work is installed, the question shifts from prosecution to remedy, and the two are not the same thing.

The building control consequence is the most concrete. Unauthorised works are illegal, leave the householder and the installer liable to prosecution by the council, may prejudice the sale or remortgaging of the property, and may result in the works having to be regularised by Building Control⁵. Regularisation is not a formality: it means opening the work to inspection, and often correcting it.

The certification consequence follows. A registered installer will be approved to carry out the work to comply with building regulations without involving local authority building control, and a certificate is issued on completion²⁶. Where that route was never available because the installer was not registered, the certificate does not exist, and the householder is left holding work with no compliance record. For electrical work, a qualified installer, registered or not, should give a signed BS 7671 electrical safety certificate for all types of electrical work, and installers who are not registered competent persons may use a registered third-party certifier to certify work²⁷.

The safety consequence is the one that cannot wait for a legal process. Gas work is restricted to registered engineers holding current qualifications precisely because the failure mode is carbon monoxide and explosion, not paperwork¹. Where a gas appliance has been fitted or serviced by someone not on the register, the safety question comes before the complaint.

For households, the independence picture is uncomfortable. A registered installer working under a competent person scheme removes the household's dependence on the local authority to certify the work, and gives the household a certificate it can produce at sale²⁶. A false claim removes that, and substitutes a private assurance that was never true. The household is left dependent on a council to regularise, a guarantee provider to pay out, and a scheme to discipline a business it may no longer be able to find.