Gas Safety Certificates: Landlord Guide for 2026
DueProper Team · Published 15 January 2026 · Last reviewed 8 February 2026
As a landlord in England or Wales, a gas safety certificate (officially called a Landlord Gas Safety Record or CP12) is one of the most important compliance documents you need. Here's everything you need to know.
Who needs a gas safety certificate?
Every landlord who lets a property with any gas appliances — boilers, cookers, gas fires, or gas water heaters — must have an annual gas safety check carried out by a Gas Safe registered engineer.
This applies to:
- All residential rental properties with gas
- Houses, flats, and HMOs
- Properties in England and Wales (and Scotland, though DueProper currently covers England and Wales)
What does the check involve?
A Gas Safe registered engineer will inspect all gas appliances, fittings, and flues in the property. They'll check for:
- Gas leaks
- Correct pressure and flow
- Safe operation of all appliances
- Adequate ventilation
- Safe operation of flues and chimneys
How often do you need one?
Every 12 months. The check must be completed within 12 months of the previous check.
Top tip: You can get the check done up to 2 months before the expiry date and the renewal will still count from the original expiry date (not the date of the new check). This gives you a buffer to arrange the inspection without losing time.
What are your obligations?
- Arrange the annual check with a Gas Safe registered engineer
- Provide a copy to existing tenants within 28 days of the check
- Provide a copy to new tenants before they move in
- Keep records for at least 2 years
What happens if you don't comply?
Failing to comply with gas safety regulations is a criminal offence. Penalties include:
- Fines of up to £6,000
- A criminal record
- Imprisonment in serious cases
- Invalidation of your landlord insurance
- Inability to serve a Section 21 notice (England)
How much does a gas safety check cost?
Typical costs range from £60 to £120 depending on the number of appliances and your location. Some engineers offer discounts for multiple properties.
How DueProper will help
DueProper will track your gas safety certificate expiry dates and send you automated reminders before they're due. Upload your CP12 certificate as evidence and maintain a complete audit trail.
Coming soon — join the waitlist for early access.
Check your compliance score for free →
Related reading
- Smoke and CO alarm regulations for landlords — related safety obligations
- The complete UK landlord compliance checklist for 2026 — all 13 obligations in one place
- How much do landlord fines actually cost? — penalties for gas safety breaches and other non-compliance
- The Renters' Rights Act: what landlords need to do now — Section 21 changes and what they mean for gas safety compliance
Free tools
- Compliance Deadline Calculator — check when your gas safety certificate expires
- Landlord Fine Calculator — see the penalties for missing a CP12
This article is for information only and does not constitute legal advice. Always verify your obligations with current legislation at legislation.gov.uk.
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DueProper will track all 13+ compliance obligations, send deadline reminders, and store your evidence. Join the waitlist for early access.