How much does a landlord gas safety certificate (CP12) cost in London?
A landlord gas safety certificate (CP12) in London typically costs £60–£120 for a property with a boiler and hob. Each additional gas appliance adds £10–£25.
Low
£60
Typical
£85
per certificate
High
£120
Based on London market research, updated July 2026. First-party London Heroes data will replace this as jobs complete.
The legal position
Landlords must have every gas appliance and flue checked annually by a Gas Safe registered engineer, give tenants a copy of the record within 28 days, and keep records for two years. There is no grace period — an expired certificate is a compliance breach from day one.
The check itself takes 30–45 minutes per appliance. Combining the CP12 with the annual boiler service in one visit usually saves £30–£50 against booking them separately.
Common questions
Can any plumber issue a CP12?
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Reviewed by the London Heroes Operations Team · Last reviewed: . This guide is general information, not a quote or a substitute for advice from a qualified professional.