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Things You Need to Know About CP12

As a Landlord, you have a moral and legal responsibility to conduct annual gas safety checks on every gas appliances within your rented property portfolio. These tests must be completed by a Gas Safe registered engineer. The completed tests (if successful) will confirm that all appliances (within a specific property) are safe to use in line with Gas Safe regulations, whereupon a CP12 certificate will be issued as confirmation. The test also reduces any associated risks, i.e. CO emissions or gas leaks potentially causing an explosion, all of which can be life-threatening!

As a landlord or letting agent, you are responsible for keeping accurate records to avoid expiry of the CP12 certificate. Both may be held accountable if it results in an incident after expiry? 

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It might be considered good practice to give a copy of the certificate to the tenant/s confirming ‘all is safe’ gas appliance wise. What is actually tested by a gas safe engineer when conducting a CP12, as for many Landlords and tenants it’s a mystery.  

What is a CP12 Certificate ?

The CP12 certificate is basically an abbreviation of the authorized regulatory body CORGI Performa 12. For almost two decades 1991-2009, it was the legally authorized body for UK gas installers. However, after it being ceased in 2009, the body was replaced by the Gas Safe register. 


As you might already know that gas safety checks should be carried out each year. After the check is complete, you will be handed a Cp12 certificate to provide evidence that the landlord has followed all the obligations related to gas safety regulations in 1998. 


As a landlord, you are supposed to keep the records in order to avoid any legal complications just in case any inconvenience occurs even after a proper check. Make sure the safety check is carried out by a certified Gas Safe Engineer by checking the unique 7-digit number on their ID Card. 

What is tested during a CP12 inspection

A thorough CP12 gas inspection will include every gas appliance in a property, such as cookers, ovens, boilers, pipeworks, gas fires, fittings, chimneys, and flues, etc. all are thoroughly checked. Here’s the list of some key checks upon completion after inspection:


  • Check appliances for gas tightness.
  • Check to stand and working gas pressure.
  • Check the burner pressure/gas pressure as indicated on the manufacturer’s data plate. 
  • Check for satisfactory provision of required ventilation.
  • Check for safety device functionality. 
  • Check for misuse of any gas device. 


If the test fails due to one or more of the above, the Landlord is obligated to arrange for the repairs to be completed prior to re-inspection. The repair costs will be extra. The CP12 will also contain the following data: –


  • Name and address of the property owner. 
  • Address of relevant property.
  • Locations and details of the appliances and flues.
  • Name, ID, and signature of the Gas Safety engineer carrying out the test. 
  • Date of the check.
  • Issues detected and remedial required.
  • Statement from engineer approving a proper test. 
  • Date of next scheduled gas safety check.


Once the test has been completed by a competent Gas Safe Engineer, you will (within 24 hours) receive the CP12 certificate. Please keep this safe. Your managing agent or the company who completed the inspection will keep records for several years. You may want to give the tenant/s a copy as well for reassurance and peace of mind. 

Difference between CP12 and Landlord’s Gas Safety Certificate

Actually, there is no difference between the two documents, except for the name that can be used interchangeably. After CORGI lost its recognition as a regulatory body of UK engineers, the CP12 designation was considered appropriate no longer. Therefore was replaced by the name “Landlord’s Gas Safety Certificate” to make it more generic.

What if you loos your CP12 Certificate?

Although CP12 Certificates these days are digital that can be stored in cloud storage and can be sent to anyone when required. However, if you still keep paper certificates, We’d recommend keeping it in an organized file system to keep it safe. Also, make sure you request an extra copy from the company fo back-up just in case you lose the original one.

Whats's the price

There are no fixed charges for a CP12 certificate. Therefore it depends upon your engineer how much he/she charges for a full gas check.  It is always advisable to discuss all your gas appliances with our dedicated team when booking your Gas Safety visit. The average price rate lies between 35-150 pounds depending on the number of gas appliances checked. However, it can cost more if the test somehow fails and there are any repairs required. Or visit the following page on our website for details:  Gas Safety Certificate

What is being Checked

In a proper CP12 gas check, every gas appliance such as ovens, boilers, pipeworks, and fittings, chimneys, and flues, etc are thoroughly checked. Here’s the list of some common checks listed after a thorough inspection:


  • Check appliances for gas tightness.
  • Check to stand and working gas pressure.
  • Check the burner pressure/gas pressure in accordance to the manufacturer’s data plate. 
  • Check for satisfactory provision of required ventilation.
  • Check for safety device functionality. 
  • Check for misuse of any gas device. 

If any of the aforementioned checks fail, the landlord is required to arrange necessary repair job before re-inspection is carried out. All the repair costs will be added as extra charges.

Should Tenants have a CP12 Certificate Copy

Although it doesn’t seem that of a big deal, Insulating your pipes can prove to be handy in chilly winters, preventing your pipes from freezing up. The good thing is, you won’t need a professional to perform this task as any DIY can perform it quite easily. Just measure the size of your pipes and visit the nearest electrical or plumbing equipment store, buy foam tubes, and fit them around your pipes.

A Brief Summary of the Landlord’s responsibilities:

Here’s a breakdown of some landlord’s responsibilities while carrying out Safety Check:


  • Only allow the registered Gas-tight engineer to do repair work on any gas appliance. 
  • Always consult a Gas-Safe engineer to carry out the annual safety check on household’ gas appliances. 
  • Give the tenants a copy of the CP12 certificate within 28 days of performing the check.
  • Show the tenants on how to switch-off gas from the network in case of an emergency.
  • Keep a reminder for an upcoming gas safety check as most landlords often forget to do it on time. 

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