In order to issue a gas safety landlords certificate (CP12) the engineer has to undertake the following gas safety checks:

  • Gas supply
  • Gas appliances
  • Gas flues
  • Ventilation

What do gas safety checks include for a gas boiler?

  • Check appliance for gas tightness
  • Check that sufficient gas pressure is being delivered to the appliance by the gas pipe work
  • Check the appliance is working at the correct gas pressure
  • Check that the ventilation provided is adequate
  • Test the flue for the satisfactory removal of combustion products
  • Test the appliance for spillage of the products of combustion
  • Check flue termination is correctly installed
  • Check that all safety devices are working correctly
  • Gas safety landlords engineers also check the satisfactory operation of all the flame failure devices
  • Check to ensure the piping is rigid and not flexible hose
  • Check for signs of unsafe or irresponsible operation
  • The gas rate and pressure of burner against recommended values also undergo gas safety checks
  • Check that stability brackets are correctly installed where required
  • Perform any other gas safety checks as required by manufacturers instructions
  • Verify that the appliance is safe to use

An appliance can only pass all gas safety checks for boilers and have a gas safety certificate (CP12) issued when the above have all been satisfactorily completed.

A gas safety landlords certificate (CP12) can be carried out for you by a Gas Safety Landlords engineer within 24- 48 hours.

To book in your gas safety certificate (CP12) please call Gas safety Landlords on 0208 951 6828 | 0333 320 0451 or email us at