Landlord guide · Gas safety
Gas safety certificate (CP12) for landlords
You need a gas safety check every 12 months by a Gas Safe registered engineer. Give a copy of the record to existing tenants within 28 days, and to new tenants before they move in.
The short version
Every gas appliance and flue you provide for tenants needs an annual safety check. The engineer records it on a gas safety record, often called a CP12. Keep each record for at least two years.
You'll also upload the record when you register the property, if it has a gas supply.
What the check covers
HSE says landlords must check the gas appliances, permanent or portable, and flues that they own and provide for tenants. Only a Gas Safe registered engineer can do the check. The back of their ID card shows the gas work they are qualified for.
When the next check is due
The deadline is exactly 12 months after the previous check. You can have it done up to 2 months early and keep the original deadline, so an early check doesn't shorten the year.
If you use that flexibility, keep each record until two further checks have been done.
Who gets a copy, and when
- Existing tenants: within 28 days of the check
- New tenants: before they move in
- The register: when you register the property, and a new record within 28 days of the old one expiring
What the record must show
- Each appliance or flue checked, and where it is
- The engineer's name, registration number and signature
- The date of the check and the property address
- Your name and address, or your agent's
- Any safety defects found and what was done about them
What Redilet does and doesn't do
Redilet's free checker reads your gas safety record and flags one that has expired or is close to it. It can't tell whether the appliances are safe. Only a Gas Safe registered engineer can do that.
Official sources
- Gas safety check records and what to keep (HSE)
- Gas safety checks: who needs them (HSE)
- Gas safety checks: who can do them (HSE)
- Register your rental property service: guidance for landlords (GOV.UK)
Checked on 5 November 2026. Check them before you act. This page is researched information, not legal advice.
Frequently asked questions
Is a CP12 the same as a gas safety certificate?
Yes, in practice. HSE calls it a gas safety record. CP12 is a common name for the form many engineers use.
Does a property with no gas supply need one?
No. The register asks for a gas safety certificate only if the property has a gas supply.
Do I need a new check when a new tenant moves in?
Not if the current record is still in date. New tenants must get a copy before they move in.