Gas Safety Certificate (CP12)
A gas safety certificate (CP12), often called a Gas Safety Record or CP12, is the written confirmation from a Gas Safe registered engineer that gas appliances, fittings and flues in a property have been checked and are safe at the time of inspection. In most rented homes with gas, the landlord must arrange a gas safety check at least once every 12 months and give the tenant a copy of the latest record.
The certificate usually lists each appliance checked, such as boiler, hob, fire, test results, any defects, and whether the installation is safe to use. If there are serious issues, the engineer may cap an appliance off and the landlord must carry out repairs or replacements promptly.
In England and Wales, providing a valid gas safety record is a core landlord duty under gas safety regulations and wider “fitness for human habitation” rules. Failure can lead to criminal enforcement and may also affect a landlord’s ability to serve certain possession notices.
Tenants should keep copies of certificates, report suspected gas problems immediately, and contact the Gas Emergency Service if they smell gas or suspect a leak.
Also see our landlord blog articles, a number of these are about property and tenant safety:
Gas Safety Certificates: The Complete UK Landlord Guide 2025
Electrical safety inspections for landlords: Your complete EICR guide for 2026
Ensuring your property is fit for human habitation: a landlord’s guide
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