The landlord gas safety certificate (CP12): renewal rules, deadlines and the MOT trick

What the check covers and who can do it

The engineer checks every gas appliance and flue you provide: tightness of the system, appliance operation, ventilation, flue flow, and safety devices. Appliances the tenant brought remain the tenant’s responsibility, but the pipework serving them is still yours.

Only a Gas Safe registered engineer can do it — check the engineer’s ID card (front: photo and expiry; back: the work categories they’re qualified for). "Corgi registered" ceased to exist in 2009; anyone offering it is a red flag.

The MOT-style renewal window

Since 2018 you can have the annual check done in months 10–12 of the current certificate and keep the original expiry date — exactly like an MOT. Renew two months early and you lose nothing; the new certificate still runs 12 months from the old expiry, not from the check date.

This is the fix for the classic failure mode: waiting until the deadline week, then losing the statutory excuse because the tenant was away. Book at month 10, every year.

The copy deadlines everyone forgets

The certificate itself is only half the duty — the copies have their own clocks:

• •Existing tenants: a copy within 28 days of the check
• •New tenants: a copy BEFORE they move in
• •Records kept for at least 2 years (keep them for the tenancy life — possession claims ask for history)
• •Proof you served the copies — a dated email beats a memory

When the tenant won’t give access

You cannot force entry, but you must show you took all reasonable steps: write to the tenant explaining the safety-law duty, offer multiple appointments, and keep dated copies of every attempt. Three documented attempts with explanations is the benchmark HSE guidance recognises as a reasonable-steps defence.

This is one of the places a paper trail is the difference between "compliant landlord frustrated by access" and "criminal breach".

Penalties and knock-on effects

Failure is expensive in more ways than the fine:

• •Criminal offence under the Gas Safety (Installation and Use) Regulations 1998 — unlimited fines and, in serious cases, imprisonment
• •Possession risk: courts expect gas safety compliance evidenced when you seek possession, and missing certificates have sunk claims
• •Invalidated insurance is common where certificates lapsed
• •A tenant injured by a gas defect with a lapsed certificate is a negligence claim with the liability question pre-answered

How LetClerk handles it

On Compliance Managed we diarise every property at month 10, book a Gas Safe engineer (yours or ours), chase tenant access with the documented three-attempt trail, file the CP12, and serve tenant copies with proof — the whole obligation, evidenced. Your property register shows the exact renewal date and its status at all times.

Common questions

How much does a CP12 cost?

Typically £60–£120 depending on region and appliance count, often bundled with a boiler service for a little more. The penalty regime makes it the cheapest insurance in the landlord world.

My property is all-electric. Do I need one?

No — no gas appliances and no gas supply means no CP12 duty (cap a redundant supply and keep evidence). Your electrical duties (EICR every 5 years) do the equivalent job on that side.

Does the certificate expire 12 months from the check date?

From the check date on a first certificate — but on renewals done in months 10–12, the new certificate runs from the OLD expiry date, so early booking costs you nothing. Renew earlier than month 10 and the clock resets to the check date.

What if the engineer finds a defect?

The record will classify it (immediately dangerous, at risk, or not to current standards). Dangerous appliances get disconnected with your consent and must be fixed before use; keep the remedial invoice with the certificate as part of the trail.

Do I need a gas certificate for a lodger in my own home?

Yes — resident landlords with a lodger still owe gas safety duties for the gas appliances the lodger uses. The annual check applies; the tenancy-copy deadlines apply in adapted form.