Gas Safety Certificate: CP12 Rules and Renewal for Landlords

Every landlord with a gas appliance or flue in a rented property must hold a valid gas safety certificate, also known as a CP12. This guide explains what the gas safety certificate covers, how long it lasts and the renewal rules every landlord needs to follow. You can book a gas safety certificate online in minutes.

For the official guidance, see HSE gas safety at home.

What is a gas safety certificate?

A gas safety certificate, or CP12, is the record a Gas Safe registered engineer issues after carrying out an annual gas safety check. It confirms that each gas appliance, flue and pipework installation inspected is safe to use, and it records any defects found and any actions required.

Is a gas safety certificate a legal requirement?

Yes. Under the Gas Safety (Installation and Use) Regulations 1998, landlords must have the gas appliances and flues in each rented property checked every 12 months by a Gas Safe registered engineer, and must keep a record of that check.

Annual gas safety check by a Gas Safe registered engineer
Copy of the certificate given to new tenants before they move in
Copy given to existing tenants within 28 days of the check
Records kept for at least two years
Copy provided to the local authority on request

Failing to carry out the annual check or provide the certificate is a criminal offence. Landlords can be fined up to £6,000 per offence, so staying on top of your renewal date protects both your tenants and your business.

How long is a gas safety certificate valid?

A gas safety certificate is valid for 12 months. The next check must be carried out before the anniversary of the last one, and the new certificate runs for a further 12 months. There is no grace period, so it is important to book in good time.

Book Your Property Safety Certificate Online

Next-day inspection slots available across London and Home Counties. Fast 24-hour digital PDF certificate delivery by accredited Gas Safe, NICEIC and IFE registered engineers.

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When should you renew your gas safety certificate?

The early renewal window

You can have the annual gas safety check carried out up to two months before the certificate expires without losing your renewal date. A certificate renewed within this window still runs for 12 months from the original expiry date, so booking early never shortens your cover. You can see how this fits into your wider duties on our gas safety for landlords page.

What if your certificate lapses?

If the certificate runs out, the property is immediately non-compliant and you can face a fine of up to £6,000 per offence. A lapsed certificate can also delay serving a valid notice to regain possession and may affect your insurance cover, so renew before the date slips.

Do you need a certificate if the property has no gas?

No. If the property has no gas supply and no gas appliances, there is nothing to check and no gas safety certificate is needed. You should still keep a written record of why no certificate is required, in case a tenant or enforcing authority asks.

How to find a Gas Safe registered engineer

Only engineers on the Gas Safe Register are legally allowed to carry out gas work, including annual safety checks. Always confirm the engineer is registered before the appointment. If you need help, contact Smart Property Checks and we will arrange a qualified engineer for you.

Why choose Smart Property Checks?

Smart Property Checks works with Gas Safe registered engineers to keep your gas safety certificate current and your tenants safe. If you need urgent certification or bundled packages across the capital, explore our accredited property safety checks in London. We make annual compliance simple—contact our team to arrange your inspection today.

The booking process

Select the gas safety certificate service for your property
Choose a convenient appointment slot
A Gas Safe registered engineer carries out the annual check
You receive your CP12 and a reminder for next year’s renewal

Book your gas safety certificate today with Smart Property Checks and stay compliant all year round.

Common Questions

How long does a gas safety certificate last?

A gas safety certificate (CP12) is valid for 12 months from the date of the check. It must be renewed before the anniversary date.

How much does a gas safety certificate cost?

A domestic gas safety check typically costs between £60 and £120 depending on the number of appliances. Check our gas safety certificate services for current pricing.

Is a gas safety certificate a legal requirement?

Yes. Landlords must have the gas appliances and flues in each rented property checked every 12 months by a Gas Safe registered engineer and keep a record of the check.

Who can carry out a gas safety check?

Only a Gas Safe registered engineer can legally carry out a gas safety check and issue a CP12. Always verify the engineer’s registration.

How often does a gas safety check need to be done?

At least once every 12 months. The next check must be carried out before the anniversary of the last one.

Can I renew my gas safety certificate early?

Yes. You can renew up to two months before the expiry date without losing your renewal date, so the new certificate still runs for 12 months from the original expiry.

What happens if my gas safety certificate expires?

The property is non-compliant immediately and you can be fined up to £6,000 per offence. A lapse can also delay serving a notice to regain possession.

Do I need a gas safety certificate if there is no gas?

No. If the property has no gas supply and no gas appliances, no gas safety certificate is required, but you should keep a written record explaining why.

When do tenants get a copy of the certificate?

New tenants must receive a copy before they move in, and existing tenants within 28 days of the annual check being carried out.

Book your gas safety certificate with Smart Property Checks

Keep your tenants safe and your tenancy compliant. Book your gas safety certificate with Smart Property Checks and let a Gas Safe registered engineer handle the annual check.

Arrange your gas safety check today and get your CP12 without the hassle.