Tradesman Left No Gas Safe Certificate — How Do I Get the Work Checked?

This is a question I used to be asked a lot — and I mean a lot. My reply was always the same: why did you let someone carry out gas work knowing they weren’t Gas Safe registered?

If someone’s worked on a gas appliance or pipework in your home and you can’t get hold of them, and they never gave you a certificate, the right move is to get another Gas Safe registered engineer out to inspect the work — don’t wait on it.

But here’s the thing: when you call a fully registered engineer to check someone else’s work, most will say they’re not interested. I’ll get to why in a moment.

Why this matters more than it might seem

Gas work that hasn’t been signed off means you genuinely don’t know whether it’s been carried out safely. It might well be fine — plenty of unregistered or dodgy operators do competent work by luck rather than training — but there’s no way to know that without someone qualified actually checking it. This isn’t a “better safe than sorry, eventually” situation; it’s worth sorting quickly.

Why a registered engineer may say no

When you search for a registered gas engineer to come and check over work carried out by someone who claimed to be registered but you never actually saw proof of it, most will turn the job down.

The reason is legal exposure. Signing off, or even formally inspecting, someone else’s unverified gas work leaves an engineer open to prosecution under health and safety law if something later goes wrong — a very slim chance, but it happens, and no one wants to carry that risk for a stranger’s work.

I used to carry out a lot of work in central London, mainly new boiler installations and annual services. I’d regularly get approached by builders doing house renovations asking if I’d sign off a boiler install someone else had fitted. My answer was always no — even when offered up to £500 to do it.

The reason was simple: it’s illegal, and when you sign off someone else’s gas work, you become responsible not just for the work itself, but for the whole gas supply in that property. You don’t know if there’s a problem with another appliance, or whether something else in the property meets current gas and building regulations. That’s not a risk worth taking for anyone.

The insurance angle people don’t think about

Something people rarely consider when hiring an unregistered gas engineer is what it does to their property insurance. If you ever need to claim for something caused by a gas appliance, and the work behind it wasn’t done by someone properly registered, your insurer can — and often will — void the claim. Insurance companies are quick to take your money when you sign up; when it comes to paying out, they look for any reason not to. Unregistered gas work is exactly that kind of reason.

What to actually do

• Search the Gas Safe Register website and enter your postcode — it’ll bring up a list of registered engineers local to you.
• Contact one or two and ask specifically for a homeowner’s Gas Safety Inspection. You don’t need to go into detail about the previous work — just ask for the inspection.
• They’ll attend and start with a gas tightness test, to confirm there are no leaks in the supply. From there, they’ll check each appliance individually — flame picture, ventilation, correct installation, and so on.
• Once done, you’ll be given a certificate detailing the appliances checked and any faults found. If something serious turns up, they’ll tell you directly and, with your permission, isolate the appliance to make it safe. If you refuse to let them make it safe, they’re required to report it to the gas emergency service for their own protection — it’s logged as a fault reported and refused by the homeowner.

It’s worth being clear about one thing: this inspection doesn’t retroactively “sign off” the original work. What it does is confirm the gas supply and appliances are safe at the time of the inspection. In some cases, if a serious problem is found, the only real fix is having all of the previous work removed and redone properly by a registered engineer.

A job I remember well

I once got a call for what sounded like a routine boiler service. When I got there, the customer told me it was the boiler’s first service, and that it needed doing for the warranty — a 5-year one. I asked for the benchmark book so I could log the service properly and compare it against the installation record.

There was nothing in it. When I asked why, he said the installer had told him the first-service engineer would fill in all the details. I asked who’d installed it — turned out it was “a friend of a friend,” who’d apparently said he was registered but had forgotten his ID card that day.

I explained that’s not how it works, and that I couldn’t complete the benchmark book on someone else’s behalf. He got upset, told me I had to do it or his warranty would be void, and that it was my responsibility to sort it. I told him I’d be contacting Gas Safe to report what I’d found — his response was to tell me to go ahead, because he wanted me reported for not completing the service.

Gas Safe told me to make sure the supply and boiler were safe before I left, and that they’d send an inspector out to look into it. I left without being paid — which does happen sometimes when a customer isn’t happy with the answer they’re given.

A few weeks later I was asked to meet the Gas Safe inspector at the property. The customer again insisted I should have completed the benchmark book, and even tried to have the original installer reported for not doing it himself — while still refusing to give the inspector that installer’s details.

The inspector explained plainly: none of that was possible. All that could be done was making sure the boiler was currently safe. There was no warranty — he’d used someone who wasn’t Gas Safe registered, and that installer could be prosecuted if identified. If he wanted a valid warranty, the boiler would need to come out and a proper new install carried out, at his own cost. His attitude changed fairly quickly after that.

In the end, the inspector offered a practical middle ground: a homeowner’s Gas Safety Inspection and a proper service, so at least he’d know the boiler was safe, with everything logged correctly in the benchmark book — but without me signing it off as the original installer, since I wasn’t. The warranty stayed void unless the manufacturer decided otherwise, which was unlikely. He agreed, thanked the inspector, and that was that.

The lesson for next time — and it’s worth repeating

Always ask to see a tradesperson’s Gas Safe ID card before they start any gas work, not after. It’s a physical photo ID card, not just something they can tell you verbally, and it shows exactly what categories of gas work they’re actually registered for — someone can be registered for cookers and nothing else, for instance, so it’s worth checking it covers the specific job. A genuine Gas Safe engineer will never mind being asked to show it; it’s the ones who dodge the question you need to worry about.