How often does a landlord need a gas safety certificate?

Every 12 months. Under the Gas Safety (Installation and Use) Regulations 1998, landlords must have every gas appliance and flue they provide checked annually by a Gas Safe registered engineer, give tenants a copy of the certificate, and keep records for at least two years.

What happens during a gas safety check?

The engineer tests each gas appliance for safe operation, checks flues and ventilation, tests for gas tightness, and records any defects. The completed CP12 certificate lists the appliances checked, the engineer's Gas Safe registration details, the results and any remedial action required.

Do I need carbon monoxide alarms in a rental property?

Yes. Since October 2022 rented homes in England must have a carbon monoxide alarm in every room containing a fixed combustion appliance (excluding gas cookers), and smoke alarms on every storey used as living accommodation. Alarms must be repaired or replaced once a landlord is told they are faulty.

Gas Safety Certificates

Annual CP12 gas safety checks by Gas Safe registered engineers — for rented homes, commercial premises and HMOs — plus carbon monoxide and smoke alarms supplied, fitted and certificated in the same visit.

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The rules at a glance

What the law requires of landlords

The Gas Safety (Installation and Use) Regulations 1998 make it a legal duty for landlords to have every gas appliance and flue they provide checked every 12 months by a Gas Safe registered engineer. A copy of the certificate must go to existing tenants within 28 days of the check — and to new tenants before they move in. Records must be kept for at least two years.

The penalties are serious: prosecution can lead to fines of up to £20,000 per offence or imprisonment — and unlimited fines in the Crown Court. Where a faulty appliance causes loss of life, landlords and agents have faced manslaughter charges. This is not a certificate to let lapse.

Gas safety services

Certificates and alarms, one visit

Domestic Gas Certificate (CP12)

The annual landlord gas safety record for houses, flats and HMOs. Our Gas Safe registered engineer checks every appliance you provide — boiler, hob, fire, water heater — plus flues and ventilation, and issues the CP12 on the spot.

What's checked

Each appliance's safe operation, burner pressure and combustion
Flues, chimneys and ventilation paths
Gas tightness test at the meter
Defects recorded with clear remedial actions

Good to know

Certificate emailed same day, ready to forward to tenants
Renewal reminders so the 12-month deadline never slips
If a defect is found, we quote for the repair straight away

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Commercial Gas Certificate

Catering kitchens, offices, shops and commercial boiler plant need commercially qualified Gas Safe engineers and the appropriate certificate for the installation type. We handle commercial tightness testing, appliance checks and plant room inspections, with certification your insurer and landlord will accept.

Commercial catering and heating appliance checks
Plant room and pipework inspection with purge and tightness testing
Certification for insurers, licensing and lease obligations

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Carbon Monoxide Alarms

Carbon monoxide is odourless, invisible and lethal — and since October 2022, rented homes in England must have a CO alarm in every room with a fixed combustion appliance (gas cookers excepted). We supply and fit compliant, sealed long-life alarms in the correct locations and record them on your certificate.

Alarms to BS EN 50291, positioned to manufacturer guidance
Fitted during your gas check — no separate visit needed
Faulty alarms must be replaced promptly once reported — we handle swaps

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Smoke Alarms

The Smoke and Carbon Monoxide Alarm Regulations require at least one smoke alarm on every storey used as living accommodation in rented homes — a duty in place since October 2015 and extended in 2022. We supply, fit and test alarms, and check them as part of inventory and inspection visits.

Alarms on every habitable storey, tested and recorded
Interlinked systems available where required (and standard in Scotland)
Upgrade advice for HMOs, where fire safety rules go further

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Common questions

Gas safety questions, answered

Can I renew the certificate early without losing days?

Yes. A gas safety check carried out in the final two months before the deadline keeps the original expiry date — so renewing early never shortens your certificate. We schedule renewals in that window automatically.

What if the engineer finds a defect?

The defect is recorded on the certificate with the action needed. Unsafe appliances are made safe — which can mean isolating the appliance or the gas supply until it's repaired. We quote for the remedial work immediately so tenants aren't left without heating longer than necessary.

Does a homeowner need a CP12?

No — the legal duty applies to landlords. But an annual boiler service is still strongly recommended for safety, efficiency and keeping the manufacturer's warranty valid.

Who keeps the certificate?

You do — for at least two years — and tenants get their copy within 28 days of the check (or before moving in, for new tenancies). We email the certificate so there's always a copy in your inbox when an agent, council or insurer asks.