Why this check takes two minutes and matters more than it seems
Every so often a story does the rounds about someone who called a fitted gas hob install "a mate who's handy," and it ends with a leak, an insurance refusal, or worse. Checking whether an engineer is Gas Safe registered takes about as long as reading this sentence, and it's the single most useful thing you can do before anyone touches a gas appliance in your home.
By law, anyone working on gas appliances, pipework, or flues in Great Britain has to be on the Gas Safe Register. It replaced CORGI registration back in 2009, and it covers boilers, cookers, fires, and any other gas-fired appliance. Working on gas without being registered isn't a grey area or a minor technicality — it's illegal, and it's illegal specifically because unqualified gas work kills people through leaks and carbon monoxide poisoning.
Checking the ID card in person
Every Gas Safe registered engineer carries a photo ID card, and you should ask to see it before they start work — not after, and not just take their word that they've "got one somewhere in the van." The card shows:
- The engineer's photo and licence number
- Their qualification category — this matters, because registration is appliance-specific (someone qualified for boilers isn't automatically qualified for a gas fire or a commercial catering appliance)
- An expiry date
Genuinely, look at the expiry date. Registration lapses if it isn't renewed, and a card that expired eight months ago tells you the person holding it isn't currently checked or insured to the standard the register requires.
Checking online before they even arrive
You don't have to wait until someone's on your doorstep to check. The Gas Safe Register website has a public search tool — put in the engineer's licence number or business name and it confirms whether they're currently registered and what work categories they're approved for. It takes less time than finding a parking space for their van.
If you're booking through our Gas Safe engineers listing, the businesses there work on gas appliances and pipework, but it's still worth running that same quick check yourself before any work starts — a directory listing isn't a substitute for confirming registration on the day, and a good engineer won't mind you asking.
What's actually legal to do yourself
There's a fair amount of confusion about where the DIY line sits. You can legally do plenty around a gas appliance without being Gas Safe registered — bleeding a radiator, replacing a thermostat that isn't wired into the gas control, general plumbing that doesn't touch the gas supply itself. What you can't legally do is anything that involves connecting, disconnecting, or altering a gas appliance, pipe, or flue. That's not a suggestion — it's the law, and it's there because gas work that looks fine can still be leaking or venting incorrectly in ways that aren't obvious without testing equipment.
If in doubt, the safe rule is: if it involves the gas itself rather than the water, electrics, or casing around it, it needs a registered engineer.
Oil is different — and that trips people up
Here's where it gets genuinely confusing for a lot of homeowners, particularly anyone who's moved to Devon from a mains-gas area: oil-fired boilers and appliances are not covered by Gas Safe at all. Oil engineers are certified through OFTEC — the Oil Firing Technical Association — which is a separate registration scheme for a separate fuel type. Checking someone's Gas Safe card means nothing if you've got an oil boiler; you need to check their OFTEC registration instead, which works on the same principle — an ID card and an online register you can search.
Given how much of North Devon runs on oil rather than mains gas, this distinction matters more here than it would in a city. Our oil boiler services page explains what OFTEC registration covers and how to verify it, and it's worth reading if you've never had to check before.
Landlords: this check has extra weight
If you're a landlord, the Gas Safe check isn't just good practice — it's a legal requirement that the engineer carrying out your annual gas safety check (the CP12) is registered, and the certificate itself needs to name a registered engineer to be valid. An unregistered "engineer" can't legally issue a CP12 at all, no matter how competent they seem. Our landlord gas safety certificate guide covers what the annual check involves and what happens if it lapses.
The short version
Ask to see the card. Check the expiry date. If you've got a moment before they arrive, look them up on the Gas Safe Register site directly. If it's an oil appliance, check OFTEC instead — the two schemes don't overlap, and a Gas Safe card tells you nothing about someone's competence to work on an oil system. None of this is about distrust; it's a basic safety check that any legitimate engineer expects and won't be offended by.
What happens if the work wasn't done by a registered engineer
Beyond the immediate safety risk, using someone who isn't Gas Safe registered has consequences that outlast the job itself. Home insurance policies commonly require gas work to have been carried out by a registered engineer, and a claim linked to a gas appliance can be refused if that condition wasn't met — regardless of how competent the unregistered person turned out to be. If you ever sell the property, buyers' solicitors increasingly ask for evidence of who carried out gas work, and "a bloke down the pub" isn't an answer that satisfies a conveyancing search.
There's also a straightforward practical reason to check beyond the legal one: registered engineers carry public liability insurance that covers their work. If something does go wrong, that insurance is what stands behind any repair costs. An unregistered person working outside the law generally isn't covered by anything, which means any mistake becomes entirely your problem to fix.
A quick habit worth keeping
Save the Gas Safe Register search page as a bookmark if you're a homeowner or landlord who deals with this more than once a year. It removes the friction of "I'll check later" — which is usually how the check gets skipped entirely — and turns verification into something that takes less time than making the tea while the engineer gets their tools out of the van.