Gas Safety Certificate (CP12) Cost & Rules 2026

What is a CP12 Gas Safety Certificate?

A CP12 (Landlord Gas Safety Record) is a certificate issued by a Gas Safe registered engineer after checking all gas appliances and flues in a property. It confirms they are safe to use.

Search your property to check its boiler age and heating system details.

How Much Does a Gas Safety Certificate Cost?

Costs vary by location and number of appliances, but in 2026 expect to pay:

Money Saving Tip: Combine your CP12 with an annual boiler service. It's cheaper than booking them separately and maintains your boiler warranty.

What Does the Engineer Check?

1. Gas Tightness: Checks for gas leaks in the pipework.
2. Burner Pressure: Ensures gas pressure is correct.
3. Flue Flow: Checks that harmful gases (carbon monoxide) are removed safely.
4. Safety Devices: Checks safety cut-outs work.
5. Ventilation: Ensures adequate air supply for combustion.

Landlord Obligations

• Renew Annually: Must be done every 12 months (you can do it up to 2 months early and keep the same renewal date).
• Provide Copy: Tenants must get a copy within 28 days of the check.
• New Tenants: Must have a valid copy before moving in.
• Keep Records: Keep certificates for at least 2 years.

What If I Don't Get One?

The penalties are severe:

• Unlimited fines
• Prison sentence (in cases of injury/death)
• Invalidates landlord insurance
• Cannot use Section 21 eviction notices

Carbon Monoxide Alarms

Since October 2022, landlords MUST provide a carbon monoxide alarm in any room used as living accommodation which contains a fixed combustion appliance (excluding gas cookers). This includes gas boilers and wood burners.

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