Gas Safety Certificate Renewal: A Landlord's Complete Guide

If you rent out a property in the UK with any gas appliance — a boiler, a gas fire, a gas cooker — you're legally required to have it checked every year. This is the one compliance deadline most landlords already know about. It's also the one that still catches people out most often, usually because the renewal date creeps up quietly between tenancies, portfolios grow, or a certificate simply gets buried in an inbox.

Here's exactly how it works, what the actual legal requirement is, and what happens if a certificate lapses.

What the law actually requires

Under the Gas Safety (Installation and Use) Regulations 1998, if you let a property with any gas appliance or installation, you must:

• Have every gas appliance and flue checked by a Gas Safe registered engineer at least once every 12 months
• Keep a record of each check (the "Gas Safety Record" or "CP12")
• Give a copy of the current record to your tenant within 28 days of the check, and to any new tenant before they move in
• Maintain pipework, appliances and flues in a safe condition throughout the tenancy — not just on the day of the check

The 12-month clock runs from the date of the last check, not the calendar year, and not the start of the tenancy. If your last check was on 14 March, your next one is due by 14 March the following year — regardless of when tenants move in or out in between.

What happens if you miss the deadline

Ignoring this isn't a paperwork slip — it's a criminal offence, enforced by the Health and Safety Executive (HSE) rather than your local council. In serious cases, particularly where a lapse leads to actual harm, landlords have faced unlimited fines and even imprisonment.

There's also a practical knock-on effect that catches people out: if your gas safety record has lapsed, some landlord insurance policies will treat the property as uninsured for that period, and letting agents may refuse to re-let or renew a tenancy without a current certificate on file.

The renewal date isn't fixed to a season

Because the 12 months runs from the last check date rather than a fixed point in the year, gas certificates on a multi-property portfolio drift apart over time — one due in March, another in September, another in November. This is the single biggest reason landlords with more than one or two properties lose track: there's no single "gas season" to remember, just a different date for every property.

A simple way to stay ahead of it

Most landlords manage this one of two ways: a calendar reminder they set manually every year (easy to forget to reset), or a spreadsheet they have to remember to check. Both work until they don't — usually right when you're busy with something else.