Gas

What is a CP12? The Landlord Gas Safety Record explained

4 min read · Updated 11 June 2026

A CP12, properly the Landlord Gas Safety Record, confirms that the gas appliances and flues in a rented property have passed their annual safety check, carried out by a Gas Safe registered engineer.

Who needs a CP12?

Landlords of residential rented property must ensure gas appliances, fittings and flues are checked for safety every 12 months under the Gas Safety (Installation and Use) Regulations 1998.

What the check covers

  • That each appliance is burning correctly
  • That flues and chimneys clear the products of combustion safely
  • That safety devices function correctly
  • That ventilation is adequate
  • Any defects found, and the action taken

Records and deadlines

The landlord must give the tenant a copy of the record within 28 days of the check, or to a new tenant before they move in, and keep records for at least two years.

Domestic and commercial gas on CertFlow

CertFlow schedules annual and service checks, captures appliance and flue results in the field, and outputs Gas Safe-aligned records ready to issue to landlords and tenants, for both domestic CP12s and commercial gas safety certificates.

References

Sources & official guidance

Links to primary UK legislation and official regulator guidance. CertFlow is independent and not affiliated with these bodies.

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