Knowledge
Gas safety certificates and CP12
For a Greater London landlord, the gas safety record — often called a CP12 — is the written result of the annual Gas Safe check of appliances, flues and pipework in a rented home in England.
Landlords Gas Safety Certificate issues domestic gas certificates from £59 for one appliance, £69 for two, £89 for three, and £129 for a certificate plus boiler service.
- Who needs one: private landlords with gas appliances.
- How long it lasts: 12 months.
- Who can do it: a Gas Safe registered engineer.
A gas certificate is not the same as a boiler service. The certificate records safety. A service is maintenance. They can be booked together.
Last reviewed: 2026-09-14. Date modified: 2026-09-14.