How to Check an Engineer Is Gas Safe Registered

The check matters because the consequences of unregistered work are not confined to a botched repair. Gas work done by someone outside the register is illegal, and the risks it creates, from leaks to carbon monoxide, are the reason the register exists. Gas Safe Register replaced CORGI as the gas registration body in Great Britain and the Isle of Man on 1 April 2009, and in Northern Ireland and Guernsey on 1 April 2010, so any CORGI branding on a van or a card is more than a decade out of date³.

For a household, this is one of the few energy checks that is entirely within your own control. It does not depend on a supplier, a tariff or a smart meter, and it costs nothing. What it cannot do is remove the underlying dependence: a gas appliance still needs gas from the network, and a registered engineer is still a business you have to book, wait for and pay.

What the Gas Safe Register is and why checking matters

Gas Safe Register is the official hallmark for gas safety, and in Northern Ireland it is the official registration for all gas engineers¹. It is not a trade association or a voluntary scheme: it is the registration body that sits behind the legal requirement, and its remit covers finding a registered gas engineer, reporting illegal gas work (work undertaken by a person not registered with Gas Safe) and handling customer complaints about unsatisfactory gas work⁷.

The scale of the register is worth knowing when you are told that "everyone round here is registered". There were 76,630 Gas Safe registered businesses in 2023/24⁴. That is a large population, which is precisely why a verbal assurance is not a check. Registration is held by a business and by individual engineers within it, and the two are checked in slightly different ways.

Checking also protects against the specific failure mode that gas safety campaigns keep returning to. Gas Safety Week, organised by Gas Safe Register, exists to provide information about the importance of gas safety, and the 2026 edition ran from 14 to 20 September under a Take No Chances theme with advice on servicing, carbon monoxide and gas emergencies⁸. The message is consistent across the industry: the check is quick, and skipping it is the mistake.

For energy independence, the register is a form of consumer infrastructure rather than a source of supply. It gives a household a verifiable way to control who touches the gas installation, which is the part of the system you can actually govern. It does not change the fact that the gas itself arrives through a network you do not own, or that a boiler needs an annual service by someone you have to find and book.

Check the register online: postcode, business name or licence number

The online register is the primary route and accepts three kinds of search: by postcode, by business name or by licence number². The postcode search is the one to use when you are looking for someone local; the business name and licence number searches are the ones to use when someone has already been recommended or has quoted for a job.

The same search doubles as a finder. Using your postcode finds Gas Safe registered engineers in your area, and an advisor can be reached on the freephone number if the online route is not workable⁶. Anyone can verify a Gas Safe ID online at the register's website, which means the check does not require an account, a login or a phone call¹⁰.

When a business registers, it supplies its company name, its trading name if different, its company address and its phone number⁵. Those are the details that appear against a listing, so a householder comparing a quote against the register can see whether the trading name on the paperwork matches the name on the register. A mismatch is not proof of anything on its own, but it is the point at which to ask a direct question.

The register is also the route for reporting illegal gas work and for complaints about unsatisfactory work, which is worth noting before a job starts rather than after⁷. If a search returns nothing for a business that has quoted, that is the moment to stop and ask for the registration details in writing.

The Gas Safe ID card: what to look at before any work starts

Registration on a database is not the same as the right qualification for the job in front of you, and the ID card is where that distinction is visible. All Gas Safe Register engineers carry an ID card showing the type of work they are qualified to do, so it is worth asking to see it¹¹. Before any work starts in your property, ask to see the engineer's Gas Safe ID card and check that they are qualified for the specific appliance or job².

The card has two sides and both carry information. On the front, check the engineer's photograph, the start and expiry dates, the licence number, the security hologram, and that the engineer is from the business you contacted⁶. On the back, check the engineer's qualification to do the gas work you asked them to do, and that the engineer's qualifications are current⁶.

Each installer must carry an ID card, which lists the gas work they are qualified to do¹³. That wording matters: a card is not a general licence to work on anything gas. An engineer qualified on boilers is not automatically qualified on a gas fire or a commercial appliance, and the back of the card is where the scope is set out.

The practical sequence is short. Ask for the card at the door, before tools come out. Check the photograph against the person. Check the expiry date is current. Check the back for the appliance in question. If any of those four fails, the work should not start, and the register search can be repeated while the engineer is still on the doorstep.

What the law requires of anyone working on your gas appliances

The legal position is unambiguous. By law, all gas engineers must be on the register and hold current qualifications to install, repair or maintain domestic gas appliances⁶. All people working with gas have to be Gas Safe registered by law, and all gas engineers are required by law to be on the Gas Safe Register⁹. The law states that anyone working on a gas boiler must be on the Gas Safe Register⁷.

That requirement extends to maintenance as well as installation. A gas appliance should be properly installed and maintained at regular intervals by an engineer who is on the Gas Safe Register⁸. For rented homes, the duty is sharper still: an annual gas safety check must be carried out within 12 months of the installation of each appliance, by a Gas Safe registered engineer³.

Registration itself carries obligations that support the check. Registration is renewed every year, new registrations are placed on probation for three months, and records of all gas work must be kept during that probation⁵. Engineers must supply National Insurance numbers when they are registered, which is part of how the register ties a licence to a person rather than a trading name⁵.

The limits of the law are worth stating plainly. It governs who may work on gas, not how quickly they attend, what they charge or whether parts are available. A registered engineer is a necessary condition for safe gas work, not a guarantee of a good outcome, and the register's complaint route exists because registered work can still be unsatisfactory⁷.

How to check by text, and the numbers that matter

The text service is the fastest check when you are standing in a hallway with a phone. Consumers can check a business is registered by texting Gas and the business registration number to 85080, and can check an engineer is registered by texting Gas and the engineer's seven digit licence number to the same number². The seven digit licence number is the one printed on the ID card, so the card and the text check work together.

The telephone routes are split by purpose, which is where most confusion arises. The freephone number for checking an engineer and finding one locally is 0800 408 5500⁶. Technical enquiries and registration renewals use 0800 408 5577, with option 2 for renewal, and the renewal line runs a 24-hour service⁵. The register's address is 200 Cedarwood, Crockford Lane, Basingstoke, RG24 8WD, and its customer services email is register@gassaferegister.co.uk³.

Registration and renewal can be handled online, by post using an application form, or by phone, and payment is by credit or debit card⁵. That is the engineer's side of the process rather than the householder's, but it explains why a registration can lapse quietly: it is an annual transaction, and a business that has not renewed will drop off the register even though its vans still carry the logo.

Where the check sits in a wider safety routine

The registration check is one step in a sequence, and it works best when the other steps are in place. A boiler service is the annual event at which most households encounter a gas engineer, and the law requires anyone working on a gas boiler to be on the register⁷. Booking a service is therefore also an opportunity to run the check, and the boiler service frequency page sets out how often that should happen.

For rented homes, the responsibilities are split. A tenant should check that any engineer who visits to carry out work is Gas Safe registered¹². The landlord is responsible for arranging the annual gas safety check on all gas appliances and flues, so a tenant who rents needs to contact the landlord to arrange it rather than booking it directly¹⁷. The boiler service when renting page covers that division in more detail.

Two related checks are worth knowing about because they are often confused with this one. If you are unsure whether an engineer is accredited, check the Gas Safe website or ask them to show their registration card¹⁹. And if the problem turns out to be a gas leak rather than a registration question, the response is different: the reporting a gas emergency page covers what to do, and the smell gas who to call page gives the number.

The wider point for a household is that this check is the one part of gas safety that requires nothing from anyone else. It does not depend on a supplier's response time, a manufacturer's warranty department or a network operator. It is a verification you perform, and it is the reason the register publishes a search tool, a text number and a freephone line rather than relying on trust.