Landlord Gas Safety Certificate (CP12) Guide 2025
If you’re a landlord in the UK, one of your biggest legal responsibilities is ensuring your property is safe for tenants to live in. A Landlord Gas Safety Certificate, also known as a CP12, is a legal document that proves all gas appliances, fittings, and flues in your rental property have been checked by a qualified Gas Safe engineer.
Failing to have a valid CP12 can result in hefty fines, potential prison sentences, and — more importantly — risks to tenant safety. In this guide, we’ll explain what a CP12 is, why you need one, the costs involved, and how to get yours in 2025.
What Is a CP12 Gas Safety Certificate?
A CP12 is a report issued after a Gas Safe registered engineer carries out a gas safety check in your rental property. It confirms that:
- All gas appliances are in safe working order.
- Gas fittings and flues are installed correctly.
- There are no gas leaks or carbon monoxide risks.
The term “CP12” comes from “Corgi Proforma 12” — the old CORGI certification used before the Gas Safe Register replaced it in 2009. Today, it’s simply known as the Gas Safety Record.
Who Needs a CP12?
In the UK, you must have a valid gas safety certificate if you:
- Rent out residential property (houses, flats, HMOs).
- Let commercial premises with gas appliances.
- Provide gas appliances for tenants to use.
It applies to private landlords, housing associations, and letting agents managing properties.
How Often Do You Need a Gas Safety Certificate?
By law, landlords must:
- Renew the CP12 every 12 months.
- Provide a copy to new tenants before they move in.
- Give existing tenants a copy within 28 days of the annual check.
What’s Checked in a Gas Safety Inspection?
A qualified Gas Safe engineer will:
- Inspect all gas appliances (boiler, cooker, fire).
- Check gas pipework for leaks.
- Test flues and chimneys for safe ventilation.
- Verify the gas meter is functioning correctly.
- Ensure all safety devices work properly.
How Much Does a CP12 Cost in 2025?
Costs vary depending on:
- Property size.
- Number of gas appliances.
- Location in the UK.
Average price: £60–£120 for a standard rental property. Some engineers offer combined Gas Safety + Boiler Service packages to save money.
How to Get a Gas Safety Certificate
- Book a Gas Safe Engineer – Always check their ID and registration number.
- Arrange the Inspection – Takes around 30–60 minutes for most properties.
- Receive Your CP12 – Usually emailed or printed immediately after the inspection.
- Keep Records – Store CP12 certificates for at least two years.
Penalties for Not Having a CP12
If you rent a property without a valid gas safety certificate, you could face:
- Fines of up to £6,000 per breach.
- Up to 6 months imprisonment.
- Legal action if tenants are harmed.
- Insurance invalidation in case of an incident.
CP12 for HMOs
If you manage a House in Multiple Occupation (HMO), gas safety checks are especially important. Local councils may request proof before issuing or renewing your HMO licence.
Quick CP12 Checklist for Landlords
- Book annual gas safety checks.
- Use only Gas Safe registered engineers.
- Give tenants copies of the CP12 promptly.
- Keep records for at least two years.
- Fix any issues identified during inspection.
Frequently Asked Questions
1. Is a CP12 the same as a gas safety certificate?
Yes — CP12 and gas safety certificate are different names for the same document. CP12 is the old term from the days of CORGI registration; today, it’s called the Gas Safety Record.
2. How long does a CP12 last?
A CP12 is valid for 12 months from the date of inspection. Landlords must renew it annually to stay compliant with UK law.
3. Who can issue a CP12?
Only a Gas Safe registered engineer can carry out the inspection and issue the certificate.
4. What happens if I don’t have a CP12?
You could face fines, imprisonment, and legal action if tenants are harmed. It can also invalidate your landlord insurance.
5. Can I combine my CP12 check with a boiler service?
Yes — many engineers offer discounted packages that include the annual gas safety check and boiler servicing in one visit.
Final Word
A Gas Safety Certificate isn’t just a legal requirement — it’s a key part of protecting your tenants and property. By staying up to date with CP12 checks, you can avoid fines, stay compliant with UK law, and maintain a safe home for your tenants.
📅 Need a CP12 in 2025? Book your inspection today with a certified Gas Safe engineer and get peace of mind for the year ahead.
