The Landlord Who Checked the Certificate, Not the Engineer

The certificate that looked fine

Priya had a three-bed semi in the Midlands, let to the same family for four years. She did the things a careful landlord does: gas safety check booked every eleven months, CP12 filed the day it landed, a reminder set well before the renewal window. On paper, nothing about that property was ever close to lapsing.

Then the boiler started short-cycling. She called a new engineer, local, decent reviews, available that week — and he flagged something odd almost immediately. The flue arrangement behind the boiler wasn't compliant, and hadn't been for at least two services. He asked, carefully, who'd signed the last two certificates.

It was the same name both times. A quick check of the Gas Safe Register showed that name wasn't on it. Not lapsed, not expired — never registered at all.

How a certificate like that even exists

This is the part landlords find hardest to believe: an unregistered person can still write up something that looks exactly like a CP12. There's no central checkpoint that stops someone producing a certificate-shaped document, and a landlord working from the paperwork alone has no obvious reason to doubt it. The engineer Priya had used for two years had a van with signage, an invoice template, and a certificate number format that looked plausible. Nothing about the document itself was the tell. The tell was never in the paperwork — it was in a register Priya hadn't thought to check against the name on the form.

That's a different failure mode to the one most landlords brace for. Everyone worries about the date — the certificate that quietly runs out while you're not looking. Far fewer people think to verify that the person who signed it was ever entitled to.

What was actually at risk

The appliance itself hadn't caused a carbon monoxide incident — this is not that story, and CertMinder UK isn't going to manufacture drama it didn't have. But the exposure was real in three directions at once.

First, the legal one: landlords have a duty to have gas appliances checked annually by someone on the Gas Safe Register. A document signed by someone not on that register doesn't satisfy that duty, whatever it says on the page. For two years, Priya had, in the eyes of the law, no valid gas safety check at all.

Second, the insurance one. Buildings and landlord insurance policies routinely carry conditions around using a registered engineer for gas work. An insurer facing a claim — a fire, a leak, anything gas-adjacent — can ask to see who signed off the last check, and an unregistered name is exactly the kind of thing that lets them decline. Priya never had to find this out the hard way, but it's the scenario that makes this worth writing about rather than filing away as a one-off.

Third, the one that's easy to underweight: if this had gone to a tenant safety incident, "I had a certificate" would not have been a defence. The standard isn't paperwork — it's a qualified person actually checking the appliance.

Where the gap came from

Priya didn't find this engineer through a shady route. A previous letting agent recommended him years ago, she stayed loyal because he was responsive and the price never crept up, and she never had a reason to re-verify him once the relationship was established. That's the realistic version of this story — not negligence, just a check that happens once, at the start, and then quietly never happens again.

This is also, worth saying plainly, the kind of gap that opaque referral arrangements make worse rather than better. When an agent or platform is being paid behind the scenes to point landlords at a particular contractor, the incentive to actually verify that contractor's credentials — rather than just keep the volume flowing — gets weaker, not stronger. CertMinder UK doesn't take referral fees or kickbacks from the contractors landlords book through it, because a recommendation with money attached to it isn't really a recommendation.

The check that takes two minutes

The fix here isn't complicated. The Gas Safe Register has a free public search — by engineer name, licence number, or business — and it takes less time than reading this paragraph. Worth doing: when you first engage any gas engineer, when a certificate's engineer name changes, and periodically even with someone you trust, because registration can lapse on their end too.

It's also worth keeping the certificate itself somewhere you'll actually see it again, alongside a note of the engineer's licence number — not just the date it's due for renewal. A system built around "when does this expire" misses exactly the failure Priya ran into, because the expiry date on an invalid certificate is just as crisp as the one on a valid one.

Priya re-did the check with a verified engineer, informed her insurer proactively, and now keeps a one-line note against the contractor record for every gas job: licence number, checked, date. It's a small habit. It's also the only thing that would have caught this two years earlier.

This article is general information for UK landlords and letting agents, not legal advice. Always check current government and Gas Safe Register guidance for your specific circumstances.