Updated July 2026. If your landlord gas safety certificate has expired, you are letting the property unlawfully from the moment it lapses — so act now. Book a Gas Safe registered engineer to carry out the annual check and issue a new Landlord Gas Safety Record as your first priority. This guide explains exactly what to do, how renewal works, the real legal consequences, and how to stay compliant going forward.
Key takeaways
- A gas safety certificate (CP12 / Landlord Gas Safety Record) is valid for 12 months and must be renewed annually.
- If it has expired, book a Gas Safe registered engineer immediately and keep evidence you acted.
- You can renew up to two months early without losing your existing anniversary date.
- Give tenants a copy within 28 days of the check, and to new tenants before they move in.
- Breaches can mean a fine of up to £20,000 and/or imprisonment per offence — an unlimited fine at the Crown Court.
- Keep records for at least two years.
What to do right now if your certificate has expired
- Book a Gas Safe registered engineer today. Check the engineer is registered at the Gas Safe Register — no one else may legally carry out the check.
- Tell your tenants and arrange access, giving reasonable notice. Keep a written record of your request.
- Keep evidence you acted promptly — booking confirmations and messages. If you have struggled to get access, a documented paper trail shows you took all reasonable steps.
- Fix any faults the engineer identifies before a new record can be issued.
- Give the new record to your tenants within 28 days of the check.
Important: the law does not give you a grace period. Once the 12 months are up you are non-compliant, even if a check is already booked — so treat it as urgent.
What is a landlord gas safety certificate?
Often called a CP12, the Landlord Gas Safety Record confirms that a Gas Safe registered engineer has checked the gas appliances, flues and pipework you provide are safe. It is required under the Gas Safety (Installation and Use) Regulations 1998, which apply to anyone letting a property on a lease of under seven years. For the full duty, see our gas safety certificate requirements guide.
When does a gas safety certificate expire — and the renewal window
A certificate is valid for 12 months from the date of the check. You can have the next check done up to two months before expiry and keep the same anniversary (“deadline”) date — so renewing early never shortens your cover. If you check more than two months early, the clock resets to the new date. Set a reminder about two months ahead so you always have time to book.
The renewal process, step by step
- Schedule the inspection with a Gas Safe registered engineer, well before the deadline.
- Arrange access — tell tenants in advance and confirm a time (see arranging access with notice).
- The check covers all gas appliances, flues and pipework — gas tightness, ventilation and safety devices.
- Fix any issues; a new record is only issued once the installation is safe.
- Issue and share the new record — give tenants a copy within 28 days.
A check typically costs around £60–£100 depending on the number of appliances and your location.
The real legal consequences of an expired certificate
Letting a property without a valid gas safety check is a criminal offence enforced by the Health and Safety Executive (HSE):
- Fines and imprisonment. On summary conviction the penalty can be a fine of up to £20,000 and/or imprisonment per offence; if the case goes to the Crown Court the fine is unlimited.
- Invalid insurance. Most landlord policies require you to comply with safety law — a lapsed certificate can leave you effectively uninsured if something goes wrong.
- Council and HSE enforcement. A serious hazard can trigger improvement or prohibition action.
A note on evictions: under the old rules, an expired gas certificate could block a Section 21 notice. Since the Renters’ Rights Act abolished Section 21 from 1 May 2026, that specific consequence no longer applies — but gas safety remains a strict legal duty, and unresolved hazards can still affect a possession case brought on Section 8 grounds. Compliance is not optional.
Giving records to tenants and keeping evidence
You must give existing tenants a copy of the record within 28 days of each check, and give new tenants a copy before they move in. Keep every record for at least two years (electronic copies are fine if you can produce them). See also whether you need a certificate before a tenant moves in and how long to keep historic certificates.
Carbon monoxide alarms and ongoing safety
Since 1 October 2022 you must fit a carbon monoxide alarm in any room used as living accommodation that contains a fixed combustion appliance (gas boilers and fires included — gas cookers are excepted), and repair or replace alarms once told they are faulty. Pair this with a good carbon monoxide detector, and treat any reported gas smell as an emergency.
If a gas leak is suspected, tenants should turn off the gas at the meter, open windows, leave the property and call the National Gas Emergency Service on 0800 111 999.
Frequently asked questions
My gas safety certificate has expired — is it illegal?
Yes. Once the 12 months lapse you are letting in breach of the Gas Safety (Installation and Use) Regulations 1998. Book a Gas Safe registered engineer immediately and keep evidence you acted promptly.
How often must the check be done?
Every 12 months, by a Gas Safe registered engineer, on all gas appliances, flues and pipework you provide.
Can I renew early without losing time?
Yes — check within the two months before expiry and your anniversary date is preserved. Earlier than that resets the date.
What are the penalties?
Up to £20,000 and/or imprisonment per offence in the magistrates’ court, and an unlimited fine at the Crown Court, plus potentially invalid insurance.
What if I can’t get access?
Make and document reasonable attempts — written requests and proposed dates. This evidence shows you tried to comply.
How much does it cost?
Usually £60–£100 depending on the number of appliances and location.
Written by the Landlords Portal team — experienced UK landlords covering the private rented sector. This article is general information, not legal advice. Always use a Gas Safe registered engineer and check current guidance at HSE.
