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Gas Safety Certificate (CP12) Cost UK 2026
By The FixDelivered Team · Updated 2026-09-14 · 4 min read
Ensuring the safety of gas appliances in your property is paramount, not just for your peace of mind but often as a legal requirement. A Gas Safety Certificate, commonly known as a CP12, confirms that all gas appliances and fittings in a property have been checked by a qualified engineer and are safe to use. But what does a gas safety certificate cost in the UK, and what factors influence the price?
What is a Gas Safety Certificate (CP12)?
A Gas Safety Certificate, or CP12, is a legal document issued by a Gas Safe registered plumber after they have inspected all gas appliances and fittings within a property. This inspection confirms that the gas installation is safe and meets current regulations. It's crucial to understand that a CP12 is an inspection, not a service. While a service might be recommended, the certificate itself only confirms safety at the time of inspection.
Who Needs a Gas Safety Certificate?
While recommended for all homeowners for safety, a Gas Safety Certificate is a legal requirement for:
- Landlords: If you let a property, you are legally obliged to have all gas appliances and flues checked annually by a Gas Safe registered engineer. You must provide a copy of the CP12 to your tenants within 28 days of the check or before they move in.
- Holiday Let Owners: Similar to landlords, if you rent out your property for holidays, you must ensure all gas appliances are safe and have a valid CP12.
Homeowners are not legally required to have a CP12, but it's highly advisable to have your gas appliances checked regularly for safety.
Factors Affecting Gas Safety Certificate Cost
The landlord gas certificate price can vary significantly depending on several key factors:
- Number of Gas Appliances: The more gas appliances (boilers, cookers, fires, water heaters) that need to be inspected, the higher the cost.
- Location: Prices can fluctuate based on your geographical location in the UK, with engineers in London and the South East typically charging more.
- Engineer's Rates: Different Gas Safe registered engineers or companies will have varying hourly rates or fixed fees.
- Combined Services: Some engineers offer a discount if you combine the CP12 inspection with a boiler service or other plumbing work. This can often be more cost-effective.
- Urgency: If you need an urgent inspection, you might incur additional charges.
Average Gas Safety Certificate Costs in 2026
As a rough guide for 2026, you can expect the gas safety certificate cost to be:
- For one gas appliance (e.g., boiler only): Typically £60 - £90
- For two gas appliances (e.g., boiler and gas cooker): Typically £80 - £120
- For three or more gas appliances: Typically £100 - £150+
- Combined with a boiler service: Often £120 - £180, offering better value if your boiler is due for its annual service.
These figures are estimates, and it's always best to get a few quotes from Gas Safe registered engineers in your area. Remember, the cheapest option isn't always the best; focus on finding a reputable and qualified professional.
What's Included in a CP12 Inspection?
During a gas safety check, a Gas Safe registered engineer will:
- Check the gas appliances for gas tightness.
- Check standing and working pressures.
- Check burner pressure/gas rate against the manufacturer's data plate.
- Check for the satisfactory provision of all necessary ventilation.
- Check for the satisfactory operation of all flame supervision devices.
- Check for the satisfactory removal of products of combustion (flue flow).
- Check for any evidence of unsafe operation.
- Issue a Gas Safety Certificate (CP12) if all appliances pass the inspection.
Why Choose a Gas Safe Registered Engineer?
It is a legal requirement and absolutely essential that any work on gas appliances, including safety checks, is carried out by an engineer on the Gas Safe Register. This is the official body for gas safety in the UK. Never attempt to inspect or repair gas appliances yourself, and always verify an engineer's Gas Safe registration. Using an unregistered individual is not only illegal but extremely dangerous, potentially leading to carbon monoxide poisoning, gas leaks, or explosions.
Finding a Qualified Engineer for Your CP12
When you need a Gas Safety Certificate, it's crucial to find a reliable and qualified professional quickly. FixDelivered connects you with local plumbers and Gas Safe registered engineers who can carry out these essential checks. You can easily tell us your emergency or service need, and we'll help you find a suitable professional. Our service is designed to make finding a qualified engineer straightforward, with upfront pricing and a clear process for how FixDelivered works.
Conclusion
While there is a gas safety certificate cost involved, it's a small price to pay for the safety of your property and its occupants. For landlords, it's a legal necessity. Always prioritise safety and compliance by using a Gas Safe registered engineer for all your gas appliance inspections and maintenance. If you're looking for an engineer to issue your CP12, get a plumber now through FixDelivered.
Frequently asked questions
What is a Gas Safety Certificate (CP12)?
A Gas Safety Certificate (CP12) is a document issued by a Gas Safe registered engineer after inspecting all gas appliances and fittings in a property to confirm they are safe and meet current regulations. It is an inspection, not a service.
Who needs a CP12 certificate?
Landlords and owners of holiday lets are legally required to obtain an annual CP12 certificate. While not legally mandatory for homeowners, it is highly recommended for safety.
How long is a Gas Safety Certificate valid for?
A Gas Safety Certificate (CP12) is valid for 12 months from the date of issue. Landlords must renew it annually.
What happens if my gas appliances fail the CP12 inspection?
If your gas appliances fail the inspection, the Gas Safe registered engineer will advise you on the necessary repairs or replacements. They may also disconnect unsafe appliances. You will need to address these issues before a new certificate can be issued.
Need a plumber now? Tell us your emergency and FixDelivered will find and confirm an available local plumber near you, usually within the hour.
Written by the FixDelivered Team. Reviewed by Rupert Lowe, Editor. Last updated 2026-09-14.