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A CP12 (Landlord Gas Safety Record) is valid for 12 months from the date of the check. Under the 2018 amendment you can have the next check done up to two months early, any time from 10 to 12 months after the last one, and keep the original expiry date, so your annual cycle never drifts.
The gas safety check on a rented property must be carried out every 12 months, so a CP12 is effectively valid for a year. Miss the deadline and you're in breach of your duty as a landlord until the check is done, even if nothing is wrong with the appliances.
Before 2018, renewing early reset your annual date to the day of the new check, so diaries slowly crept earlier each year. The Gas Safety (Installation and Use) (Amendment) Regulations 2018 fixed this:
Tip: track the next-due date, not the check date. Software that flags renewals inside the 10-12 month window, like Manifold, lets you renew early where it's convenient without your dates drifting.
You must give a copy of the record to each existing tenant within 28 days of the check, give new tenants a copy before they move in, and keep the record for at least two years.
Last reviewed July 2026. This guide is general information, not legal or safety advice, gas safety work must be carried out by an appropriately Gas Safe registered engineer. Rules can change, so check the linked official sources for the current position.