Where to Find the Expiry Date on a Gas Safety Certificate

Where the expiry date sits

The expiry date on a Gas Safety Certificate sits in a box labelled "Next check due." That is the date you plan around. I've watched new landlords flip through the certificate looking for the word "expiry" and miss it entirely. The engineer writes it in plain sight, usually right on the first page, next to the date of the check and their signature. The box might say "Date next check due" or "Next safety check due," depending on the template the engineer uses. I always looked for the words "Next" and "due" and ignored the rest of the page.

A Gas Safety Certificate is officially called a Gas Safety Record, though most landlords still say CP12. A Gas Safe registered engineer completes it after checking the gas appliances, pipework, flues, and any gas leaks in a rented property. Landlords must have a new one done every 12 months under the Gas Safety (Installation and Use) Regulations 1998. The certificate lists the property address, the appliances tested, and any defects found. The "Next check due" box is the expiry date in practical terms. Once that date passes, the certificate no longer covers that annual cycle.

The two-month renewal window

Early renewal confuses a lot of new landlords. The rule I followed is not complicated. If you get the check done no more than two months before the current "Next check due" date, you keep the original anniversary. So if your certificate says "Next check due: 1 June," and the engineer comes on 20 April, the new certificate will still say "Next check due: 1 June" twelve months later. Your deadline hasn't moved. You've simply completed the annual check a few weeks early.

Do it more than two months early and the clock resets. Say the due date is 1 June, but the engineer can only come on 1 March. That is three months early. The new "Next check due" date becomes 1 March the following year, not 1 June. You've shortened your compliance cycle. That may not sound like a big deal, but it compresses the next gap between checks. You'll end up doing five checks in four years if you keep resetting early.

I booked my annual gas checks four to six weeks before the due date. That kept me inside the two-month window and gave me room if the engineer had to reschedule. If you book for the due date itself and something slips, you are immediately lapsed. Engineers run late, tenants forget to provide access, and parts fail. A month of buffer solved most of that.

What happens when you miss the date

I had a flat where the boiler check was due on 14 March. My engineer had a cancellation and could fit me in on 5 January. That was more than two months before the due date, so the next certificate came back with "Next check due: 5 January." I lost nearly ten weeks of the original cycle. That was annoying because the boiler was fine, the check was done, but the paperwork date had shifted.

There is no grace period after the due date. Some landlords assume they have a few days or a week of leeway. They don't. Once the "Next check due" date has gone, you have no valid current Gas Safety Certificate for that property until a new check is done. I always booked the next annual check about a month before the current one expired. That gave me room if the engineer had to reschedule, and it kept the due date stable year after year. If you let the certificate lapse, the fix is to get a Gas Safe registered engineer out as soon as possible and carry on from the new check date. Local authorities can take enforcement action for a missing or expired certificate, but I'm not a lawyer and the practical priority is simply to get back in compliance without leaving a gap.