Gas Safe Register — the legal requirement for gas work in the UK.
Anyone carrying out gas work in your home — installing a boiler, fitting a hob, servicing a gas fire — must be on the Gas Safe Register by law. Unregistered work is a criminal offence under the Gas Safety (Installation and Use) Regulations 1998.
What is the Gas Safe Register and who has to be on it?
The Gas Safe Register is the official UK list of engineers qualified to work safely and legally on gas appliances. By law (Gas Safety Regulations 1998), anyone fitting, repairing or servicing a gas boiler, cooker, hob or fire in England, Scotland or Wales must be on the Register. Replaced CORGI in 2009. Hiring an unregistered engineer voids your boiler warranty, your home insurance, and is a criminal offence for the engineer.
Active ID cards on the Gas Safe Register as of 2026.
NHS + insurance burden of unsafe gas work in UK homes.
Penalty for unregistered gas work under the 1998 Regulations.
Gas Safe — the terms that matter
Plain-English definitions for the 5 terms you'll see in any quote, certificate or enforcement notice for Gas Safe Register.
- Gas Safe RegisterGSR
- The official register of gas engineers qualified to work legally in the UK. Replaced CORGI on 1 April 2009. Operated by Capita on behalf of the HSE.
- Health & Safety ExecutiveHSE
- UK national regulator for workplace health and safety. Enforces gas safety law and prosecutes unregistered engineers.
- CP12 / Landlord Gas Safety RecordCP12
- Annual gas safety certificate every UK landlord must issue to tenants within 28 days of inspection. Legal requirement under the 1998 Regulations.
- Carbon Monoxide alarmCO alarm
- Mandatory in any room with a fixed combustion appliance (excluding gas cookers) in rented homes since 1 October 2022 under the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022.
- Approved Code of Practice L56ACOP L56
- HSE Approved Code of Practice covering installation and use of gas systems and appliances. Gas Safe engineers must follow.
How to verify a Gas Safe registered engineer
Five steps from instruction to certificate. Total time: 5m.
01
Ask for ID
Before work
Every Gas Safe engineer carries a photo ID card with a 7-digit licence number, expiry date, and the appliance categories they're qualified for. Ask to see it before any work starts.
02
Check categories
Before work
The reverse of the card lists what they can work on — natural gas / LPG / boilers / cookers / fires. The engineer is only qualified within those categories. A boiler fitter is not automatically a cooker fitter.
03
Verify on register
2 minutes
Look up the licence number on GasSafeRegister.co.uk. The engineer's name, business and qualifications must match the ID card exactly. Mismatches mean walk away.
04
Get the work logged
Day of install
New boiler installs and gas appliance fittings must be notified to Gas Safe (and onward to your local Building Control under Approved Document J / L) within 30 days. You'll get a certificate by post.
05
Keep CO alarm fresh
Annually
Test your CO alarm monthly, replace batteries yearly, replace the unit every 7–10 years. Any room with a combustion appliance needs one — landlords legally must provide it.
Gas Safe Register. Done compliant.
Every TradeMatch-listed tradesperson covering Gas Safe Register carries the relevant scheme registration. Verified at onboarding, re-verified annually, certificates posted to you within 30 days of any notifiable work.
Gas Safe registered vs unregistered — what changes for you
Side-by-side comparison of the compliant route versus the unregistered shortcut. Most rows trace a straight line from regulation to financial exposure.
| Factor | Gas Safe registered | Unregistered or "qualified" but not on register |
|---|---|---|
| COMPLIANT — RECOMMENDEDLegal status | Compliant — work meets Gas Safety Regulations 1998 | Criminal offence for the fitter; void boiler warranty and home insurance for you |
| Boiler warranty | Manufacturer warranty valid (typically 5–12 years) | Warranty void on day one — manufacturer will not honour parts or labour |
| Home insurance | Claims for gas-related damage paid | Claims refused — policy generally requires legal compliance |
| Building control | Auto-notified within 30 days; certificate posted to you | Self-certification not allowed; you'd have to pay LABC retroactively (£250–£400) |
| CO incident liability | Carrier of £2m+ public liability cover | No cover — your only recourse is civil claim against an individual |
| CP12 (landlords) | Engineer can issue legally valid CP12 | CP12 not legally valid — landlord still in breach of 1998 Regs |
Source: Gas Safe Register, HSE prosecutions database, ABI home insurance policy wordings 2024.
The questions homeowners ask before they commit.
How do I check if a gas engineer is Gas Safe registered?
Ask for the engineer's photo Gas Safe ID card before any work begins, then verify the 7-digit licence number on the official register at GasSafeRegister.co.uk. Cross-check the engineer's name, business name and qualified appliance categories against the ID card. If anything mismatches — walk away.
Is it illegal to install a boiler without Gas Safe?
Yes. Installing, replacing, servicing or repairing any gas appliance in a UK home without being on the Gas Safe Register is a criminal offence under the Gas Safety (Installation and Use) Regulations 1998. The engineer faces prosecution by the HSE; you, as the homeowner, void your boiler warranty and home insurance.
How much does a Gas Safe boiler service cost in 2026?
A standard annual gas boiler service from a Gas Safe engineer runs £80–£150 in 2026. London adds roughly 15–25% to the rest of the UK. The service includes flue gas analysis, casing internals check, safety device test, and a written record of the inspection.
What's the difference between Gas Safe and CORGI?
Gas Safe replaced CORGI as the UK's official gas engineer register on 1 April 2009. CORGI continues to exist as a private body offering training and accreditation, but it has no legal standing for gas work. Only Gas Safe registration meets the 1998 Regulations.
Do I need a Gas Safety Certificate (CP12) every year?
Landlords legally must commission a Gas Safety Record (informally CP12) annually for every gas appliance and flue at every rented property, and provide a copy to tenants within 28 days. Owner-occupiers have no annual legal duty but a yearly service is still recommended for warranty + safety.
Can I work on my own boiler if I'm not Gas Safe?
Legally, no. The Gas Safety Regulations 1998 apply to anyone — including the homeowner — carrying out gas work other than minor maintenance such as relighting a pilot light. Bleeding a radiator is fine; cracking the boiler casing or touching gas pipework is not.
Going deeper.
Compliant gas work, ready when you are.
Every TradeMatch-listed gas engineer is Gas Safe verified, with up-to-date appliance categories and £2m+ public liability cover.