Updated July 2026. If you let a property with gas appliances in England, you must arrange an annual gas safety check and give your tenants the record. This guide sets out exactly what a landlord gas safety certificate (CP12) is, your legal duties, the penalties for getting it wrong, and the most common questions answered.
Your gas safety duties at a glance
- Annual check of all gas appliances, flues and pipework you provide, by a Gas Safe registered engineer.
- Give existing tenants the record within 28 days, and new tenants a copy before they move in.
- Keep records for at least two years.
- Maintain appliances, flues and pipework in a safe condition between checks.
What is a landlord gas safety certificate (CP12)?
The Landlord Gas Safety Record — commonly called a CP12 — confirms that a Gas Safe registered engineer has checked the gas appliances, flues and pipework you provide and found them safe. It is required under the Gas Safety (Installation and Use) Regulations 1998 for anyone letting on a lease of under seven years.
Timing, cost and renewal
A certificate is valid for 12 months. You can have the next check done up to two months early and keep the same anniversary date. A check typically costs £60–£100 depending on the number of appliances. If your certificate has lapsed, act immediately — see what to do if your gas safety certificate has expired.
Penalties for non-compliance
Letting without a valid check is a criminal offence enforced by the HSE. Penalties can reach up to £20,000 and/or imprisonment per offence in the magistrates’ court, and an unlimited fine at the Crown Court. A lapsed certificate can also invalidate your landlord insurance.
Carbon monoxide alarms
Since 1 October 2022 you must fit a carbon monoxide alarm in any room used as living accommodation containing a fixed combustion appliance (gas cookers excepted). See our best CO alarms guide.
Frequently asked questions
How often is a gas safety check needed?
Every 12 months, by a Gas Safe registered engineer, on all gas appliances, flues and pipework you provide.
Who can carry out the check?
Only a Gas Safe registered engineer. Always check their ID card or the Gas Safe Register.
Do I have to give the tenant a copy?
Yes — within 28 days of the check, and to new tenants before they move in.
How long must I keep records?
At least two years. See keeping historic certificates.
Do I need a certificate before a tenant moves in?
Yes — see gas safety before move-in.
What if I can’t get access to do the check?
Make and document reasonable attempts to gain access — written requests and proposed dates — to show you tried to comply.
Written by the Landlords Portal team — experienced UK landlords covering the private rented sector. This article is general information, not legal advice; always use a Gas Safe registered engineer.
