Gas Safety Certificate Cost Calculator

How much does a gas safety certificate cost?

A gas safety certificate – the landlord’s CP12, or Landlord Gas Safety Record – is issued after a Gas Safe registered engineer checks the gas appliances and flues in a property. The cost is driven by the number of appliances: a single combi boiler is around £45–£80, while a boiler, cooker and gas fire together can reach £140. This calculator gives an indicative price for your appliances and sets out the annual legal duty landlords have – a duty enforced by the HSE with unlimited fines. It sizes the cost; it is not a quote.

What you need to know

• Priced per appliance – the engineer checks each boiler, cooker, hob and fire, so more appliances cost more.
• Landlords: annual and compulsory – the Gas Safety (Installation and Use) Regulations 1998 require a check every 12 months and a record given to tenants within 28 days.
• A check is not a service – the CP12 confirms appliances are safe; a boiler service cleans and tunes the boiler and is a separate (often bundled) job.
• Homeowners – no legal certificate needed, but an annual Gas Safe service is strongly advised for safety and warranty.

Worked example

A landlord needs a CP12 for a flat with a boiler and a gas cooker (2 appliances) and adds a boiler service. The safety check is around £60–£100 and the service adds £40–£90, for a typical total of roughly £100–£190. The certificate must be renewed every 12 months – and can be done up to two months early without losing the renewal date – so it is easy to keep in sequence and avoid a lapse.

Frequently asked questions

How much does a gas safety certificate cost?

A landlord gas safety certificate (CP12) typically costs between about £45 and £140 in the UK, depending on how many gas appliances are checked. A single boiler is at the lower end, while a boiler, cooker and fire together sit at the top. Prices vary by area and engineer.

Is a gas safety certificate a legal requirement?

Yes, for landlords. The Gas Safety (Installation and Use) Regulations 1998 require every gas appliance and flue in a rented property to be checked every 12 months by a Gas Safe registered engineer, with a record given to tenants. Breaches can lead to unlimited fines or imprisonment.

How often is a gas safety check needed?

For rented homes the check must be done every 12 months. A new check can be carried out up to two months before the current one expires without losing the original renewal date, which makes it easier to keep certificates in sequence.

Do homeowners need a gas safety certificate?

No. Owner-occupiers are not legally required to have an annual gas safety certificate, but an annual boiler service by a Gas Safe engineer is strongly recommended for safety and to keep the manufacturer’s warranty valid.

What is a CP12?

CP12 is the common name for the Landlord Gas Safety Record – the document a Gas Safe registered engineer issues after checking the gas appliances and flues. Landlords must give a copy to existing tenants within 28 days and to new tenants at the start of the tenancy.

Does the number of appliances change the price?

Yes. The engineer checks each gas appliance – boiler, cooker, hob, gas fire – so more appliances mean more time and a higher fee. A property with only a combi boiler is cheaper than one with a boiler, gas cooker and a fire.

Cost figures are indicative UK market ranges for 2026 and vary by area and appliances – they are not a quote. The annual landlord duty comes from the Gas Safety (Installation and Use) Regulations 1998; always use a Gas Safe registered engineer, and see GOV.UK – Renting out a property for landlord duties.