What is a CP12? The Landlord Gas Safety Record explained

4 min read · Updated 11 June 2026

Key takeaways

  • A CP12 is the common name for the Landlord Gas Safety Record.
  • Landlords must arrange an annual gas safety check by a Gas Safe registered engineer.
  • Tenants must be given a copy of the record, and the landlord must keep it.
  • Only a Gas Safe registered engineer with the right ACS qualifications may carry out the work.

For landlords, gas contractors, compliance managers and facilities teams handling landlord gas safety records and gas-service evidence. It is UK-focused and not legal advice.

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.

What inspectors commonly see

  • Work carried out by an engineer not Gas Safe registered for that appliance type
  • Inadequate flue, ventilation or combustion air provision
  • Gas tightness and combustion performance not properly tested
  • Safety devices defeated, bypassed or not working
  • Landlord gas safety records missing, overdue or not issued to tenants

Common mistakes

  • Assuming any Gas Safe registration covers every appliance type on the job.
  • Missing tenant-copy deadlines or losing proof that the record was issued.
  • Separating service records from the annual gas safety record and appliance history.
  • Not recording defects, warning notices or follow-up actions clearly.
  • Using a previous certificate without checking appliance, flue and address details match.

Records to keep

  • Landlord Gas Safety Record or commercial gas safety record.
  • Appliance and flue details, test results and engineer Gas Safe details.
  • Service history, defects, warning notices and remedial evidence.
  • Tenant issue date and copies where landlord duties apply.
  • Next annual check date and site/appliance asset history.

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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