f you’re a landlord in the UK, keeping your rental property safe and legally compliant should be a top priority. One of the most important legal requirements is ensuring your property has a valid gas safety certificate, also known as a CP12.
This document confirms that all gas appliances, flues, and pipework in your rental property have been checked and are safe to use.
In this guide, we’ll break down everything you need to know about the gas safety certificate—what it is, what’s involved in getting one, and why it’s essential for landlords.
What Is a Gas Safety Certificate (CP12)?
A gas safety certificate is an official document issued by a Gas Safe registered engineer after carrying out an annual gas safety inspection.
The term “CP12” comes from the original CORGI Proforma 12, though today it’s more commonly referred to simply as a gas safety certificate.
The certificate confirms that all gas appliances and installations in your property are working safely and in accordance with UK gas safety regulations.
Legal Responsibilities for Landlords
Under the Gas Safety (Installation and Use) Regulations 1998, landlords are legally required to:
- Ensure gas appliances, fittings, and flues are maintained in a safe condition.
- Have a gas safety certificate issued annually.
- Provide tenants with a copy of the certificate within 28 days of the inspection.
- Keep copies of certificates for at least two years.
- Ensure a valid certificate is available before a new tenant moves in.
Failing to comply can result in hefty fines, invalidated insurance, and even imprisonment in extreme cases.
What Does a Gas Safety Inspection Involve?
When you book a gas safety check, a Gas Safe registered engineer will:
- Inspect all gas appliances (e.g., boilers, gas hobs, gas fires) to ensure they’re working correctly.
- Check for gas leaks and carbon monoxide risks.
- Test flues and ventilation for proper airflow.
- Inspect pipework and connections for damage or deterioration.
- Record gas pressure and burner efficiency.
If everything passes inspection, the engineer will issue a gas safety certificate that includes details of the property, appliances checked, results of the inspection, and the engineer’s registration number.
How Often Do You Need a Gas Safety Certificate?
A new gas safety certificate must be issued every 12 months. It’s best to set a reminder a month or two in advance so you can arrange the inspection in good time.
Landlords can carry out the annual safety check any time within 10–12 months of the previous check without affecting the original expiry date. This “flexibility window” helps maintain continuity of compliance.
What If an Appliance Fails the Check?
If an appliance fails the inspection, the engineer will label it as either “At Risk (AR)” or “Immediately Dangerous (ID).” In such cases:
- The engineer may disconnect the appliance.
- Repairs or replacements must be carried out before it can be used again.
- A new inspection will be needed before a valid gas safety certificate can be issued.
Landlords are responsible for covering the cost of repairs to any gas appliances they supply.
Cost of a Gas Safety Certificate
The cost of a gas safety certificate in the UK typically ranges between £60 and £100, depending on the number of appliances and your location.
Some companies offer combined boiler servicing and safety checks as part of a package, which can be more cost-effective.
Where to Find a Gas Safe Registered Engineer
Only a Gas Safe registered engineer can legally carry out a gas safety inspection and issue a certificate. You can verify an engineer’s registration number or search for a local professional on the official Gas Safe Register.
Never use an unregistered engineer for gas work — it’s illegal and highly dangerous.
Digital vs Paper Certificates
Many engineers now issue digital gas safety certificates, which can be emailed directly to you and your tenants. This not only saves paper but makes storing and sharing documents much easier.
However, landlords are still responsible for ensuring tenants receive a copy within 28 days of the inspection, whether digitally or in print.
Final Thoughts
As a landlord, it’s your duty to protect your tenants and property. Having a valid gas safety certificate is not just a legal requirement — it’s a vital part of your property management routine that ensures the safety of everyone under your roof.
At Pro Gas Services, we provide fast, reliable gas safety inspections across [your service area]. Our experienced, Gas Safe registered engineers ensure your property remains fully compliant, with minimal hassle.
Need to arrange your annual gas check? Contact us today to book a gas safety inspection and stay compliant with UK law.
