Gas safety checks are a legal requirement for protecting households across the UK. Faulty gas appliances can produce poisonous carbon monoxide (CO) and even cause fires or explosions if not repaired, so the Gas Safe Register recommends having them tested at least once a year by a Gas Safe engineer.

This Skills Training Group guide explains all you need to know about gas safety checks, taking you through the process of testing appliances and pipework, as well as the documentation that should be provided for different types of tests (not all checks require a record or certificate).

If you’re interested in a career in gas safe engineering, take a look at our range of new entrant gas safe engineer courses.

Gas powered hob in kitchen


What is a gas safety check?

An annual gas safety check is a legal requirement and ensures that the gas appliances in a home are securely fastened to the pipework and burning gas in the correct way to prevent risk of carbon monoxide poisoning. During checks, gas safe engineers will also make sure that safety devices & gas supply are functioning properly and that the air supply to the appliance is adequate and there are no gas leaks.

Annual gas safety checks focus solely on gas appliances; a full gas installation safety check also involves a visual inspection of all gas installations and the pipework around them, as well as a test the gas supply for any gas leaks for peace of mind.

What is a CP12 Gas Safety Certificate (Gas Safety Record)?

A CP12 Gas Safety Certificate (or Gas Safety Record) is a document that’s provided to landlords for rental properties following a successful gas safety check. It provides full details of all inspections carried out by a gas safe engineer on gas appliances owned by the landlord. If a tenant owns any of the appliances (e.g. a gas cooker), these do not need to be tested for safety issues.

Gas Safety Record (CP12 Gas Safety Certificate)


It’s important to note that Gas Safety Check Records are only necessary for rented housing – homeowners are not required to keep a record of appliance checks or full gas installation safety checks, but it is still recommended that these are carried out at least annually by a gas safe engineer.

How long is a Gas Safety Certificate valid for?

A Gas Safety Certificate is valid for 12 months from the date that the check was carried out. All landlords are legally required to test the gas appliances in their properties at least once a year and provide new tenants with the most recent Gas Safety Record.

What are the penalties for not having a Gas Safety Certificate?

As a landlord in the UK, renting out a property without a Gas Safety Certificate is a very serious crime, the penalties for which can include:

  • Invalidation of your insurance policy
  • Fines of up to £6,000
  • Court action if a tenant sues for civil damages
  • A six-month prison sentence
  • Manslaughter charges if a tenant dies due to an unsafe gas appliance and/or system.

Who can issue a Gas Safety Certificate?

Gas Safety Certificates can only be issued by Gas Safe registered engineers. To join the Gas Safe Register, an engineer must first have:

  • Completed a Gas Safe Managed Learning Programme
  • Built a portfolio of gas work alongside a registered gas engineer
  • Undertaken an ACS Assessment for CCN1 and relevant appliances as per requirements of the Gas Safe Register

For more information, visit our blog on how to join the Gas Safe Register.

This guide has explained the processes involved in gas safety checks and why they’re important (this topic is explored in much greater detail as part of our CCN1 & Appliances course). We’ve also covered CP12 Gas Safety Certificates or Gas Safety Records explaining how landlords must have their gas appliances tested at least once a year to avoid fines and/or prosecution.

If you’d like to become a gas safe engineer, see our range of new entrant gas safe engineer courses. For any further questions about the issues discussed here, don’t hesitate to get in touch.

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