Quick Answer
Always ask to see a Gas Safe engineer's ID card, check the licence number on gassaferegister.co.uk, and verify they are qualified for the specific type of appliance you need worked on. It is illegal to carry out gas work without Gas Safe registration — never hire an unregistered engineer regardless of price.
Gas safety is one of the most critical areas of home maintenance in the UK. Every year, around 40 people die from carbon monoxide poisoning linked to gas appliances, and many more suffer serious injuries. In 2026, with energy costs still high and ageing boiler stock across the country, demand for gas engineers is strong — but so is the risk of encountering unregistered or under-qualified operators.
Whether you need a boiler service, a new boiler installation, a gas safety check, or a repair, this guide tells you exactly what to look for in a Gas Safe engineer, how to verify their credentials, and what questions to ask before you let them anywhere near your appliances.
In this guide
What Is the Gas Safe Register?
The Gas Safe Register replaced CORGI registration in 2009 as the official list of gas engineers legally permitted to work on gas appliances in the UK. It is managed by Capita Gas Registration and Ancillary Services Ltd, and is appointed by the Health and Safety Executive (HSE). Registration is not optional — it is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998.
The register covers England, Scotland, Wales, and Northern Ireland. Any person or company carrying out gas work without being registered is committing a criminal offence and can be prosecuted. As a homeowner, hiring an unregistered gas engineer also puts you at risk — any damage or injury caused by unregistered work may not be covered by your home insurance.
How to Check and Read the Gas Safe ID Card
Every registered Gas Safe engineer carries a photo ID card. Ask to see it before any work begins — even if you booked them through a company. Here is what to check:
| Card Feature | What It Tells You | What to Check |
|---|---|---|
| Licence number | Unique identifier, used to verify online | Use to check on gassaferegister.co.uk |
| Expiry date | Registration must be renewed annually | Must not be expired — check the date |
| Photo | Confirms the person is the registered engineer | Compare to the person in front of you |
| Appliance categories (back of card) | Lists what the engineer is qualified to work on | Must match the job you're hiring them for |
| Gas Safe logo with hologram | Security feature to prevent forgery | Should show the holographic logo |
The back of the card is particularly important. It lists the specific appliance categories the engineer is qualified to work on — for example, "Central Heating and Boilers (Domestic)," "Cookers and Hobs," or "LPG Appliances." A Gas Safe engineer registered for domestic boilers is not automatically qualified to work on commercial equipment or LPG systems. The category must match the work you need done.
How to Verify Online
Even if a card looks genuine, always verify independently. Go to gassaferegister.co.uk and click "Check a business or engineer." You can search by licence number, engineer name, or company name. The result will confirm:
- ✓ Whether the engineer is currently registered (not just previously registered)
- ✓ Which gas appliance categories they are qualified for
- ✓ The business they are registered with
This verification takes about 60 seconds and is free. There is no excuse for skipping it. For a broader look at verifying tradespeople across all trades, see our guide on how to check if a tradesperson is qualified in the UK.
Questions to Ask Your Gas Engineer
Beyond seeing the card, there are several questions worth asking. For a full checklist covering all trades, see our guide on how to find a reliable plumber — gas engineers often overlap with heating plumbers. For gas-specific jobs:
- Can I see your Gas Safe ID card and licence number?
Always ask to see the physical card — don't accept "I'm registered, don't worry."
- Are you qualified for this specific appliance type?
Check the back of the card for the relevant category.
- Will you issue a Gas Safety Record (CP12)?
For landlords, this is a legal requirement. For homeowners, it's good practice and your proof the work was done safely.
- Do you carry public liability insurance?
Standard minimum is £1 million. Ask for the certificate.
- Will you carry out a gas tightness test?
Any work on gas pipes or connections should be followed by a tightness test to confirm there are no leaks.
What a Gas Safe Engineer Can and Cannot Do
Gas Safe registration does not give unlimited scope. Here is a practical breakdown of what falls within and outside a Gas Safe engineer's remit:
| Task | Gas Safe Required? | Notes |
|---|---|---|
| Boiler installation or replacement | Yes | Must match the domestic boiler category on the card |
| Gas boiler annual service | Yes | Should include combustion analysis and safety checks |
| Gas safety check (CP12 for landlords) | Yes | Required annually for rented properties |
| Gas cooker connection to existing supply | Yes | Even if it seems minor |
| Moving gas meter or pipework | Yes + gas network notification | Meter moves require network operator involvement |
| Carbon monoxide detector installation (electric) | No | This is standard DIY; no Gas Safe needed |
| Bled radiators / general plumbing | No | General plumbing is separate from gas work |
| Oil boiler service | No (OFTEC recommended) | Oil is not covered by Gas Safe — different scheme |
Gas Engineer Costs in the UK (2026)
For landlord gas safety certificates, see our guide on how much a gas safety certificate costs in the UK. For new boiler costs, see how much a new boiler costs. Typical rates:
| Job | Typical Cost (2026) | Notes |
|---|---|---|
| Boiler annual service | £70–£120 | Includes safety checks and combustion analysis |
| Gas safety check (CP12) | £60–£120 | Certificate issued on completion |
| Boiler repair (diagnostic + fix) | £100–£350+ | Depends on part and labour |
| New combi boiler installation | £2,000–£3,500 | Includes boiler, labour, removal of old unit |
| Gas pipe extension | £150–£400 | Depends on length and routing |
| Emergency call-out (evenings/weekends) | £100–£250 call-out fee + labour | On top of standard hourly rate |
For a deeper look at boiler options, see our guide on how to choose the right boiler for your home. Post your gas job on GetQuickHelp to receive quotes from Gas Safe registered engineers in your area.
Frequently Asked Questions
Is it illegal to hire an unregistered gas engineer?+
As a homeowner, it is not illegal to hire an unregistered engineer — but it is extremely risky. The engineer commits the offence (under the Gas Safety Regulations). However, if the work causes damage, injury, or death, you may struggle to claim on insurance if the work was done by someone unregistered.
What should I do if I suspect a gas leak?+
Immediately: don't turn any switches on or off, don't use your phone inside, open doors and windows, turn off the gas at the meter, and call the National Gas Emergency number: 0800 111 999. Only call a Gas Safe engineer once the emergency has been assessed.
How often should a boiler be serviced?+
Annually. Most boiler warranties require an annual service to remain valid. A service typically costs £70–£120 and includes a safety check, combustion analysis, and cleaning of key components. Skipping services voids warranties and increases the risk of carbon monoxide leaks.
Does Gas Safe registration guarantee quality of work?+
It guarantees the engineer has been assessed as competent to carry out gas work safely. It does not guarantee a perfect job every time. For quality assurance, also check reviews, ask for references, and ensure they provide a written quote and Gas Safety Record on completion.
What is a CP12 certificate?+
A CP12 (Gas Safety Record) is the certificate issued after a gas safety inspection. It records the appliances checked, any defects found, and whether the property is safe. Landlords are legally required to have one issued annually for each rental property and must provide a copy to tenants within 28 days.
Can a Gas Safe engineer condemn my boiler?+
Yes. If a Gas Safe engineer finds that a boiler is unsafe to operate, they are required to either repair it to a safe standard or, if the homeowner refuses repair, cap the gas supply and issue a "Warning Notice." You should never pressure an engineer to leave an unsafe appliance running.
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