Gas Safety Certificate (CP12) from £49.99

What is a Gas Safety Certificate (CP12)?

A Gas Safety Certificate — formally known as a CP12 — is a document confirming that all gas appliances, flues and pipework in a rental property have been inspected by a Gas Safe Registered engineer and found to be safe. The engineer checks each appliance for correct operation, adequate ventilation, secure flue connections and correct gas pressure. Every appliance inspected is listed on the certificate along with its result.

The name CP12 comes from the standard inspection form used by Gas Safe engineers. It is not the same as a boiler service — a CP12 tests whether appliances are safe, while a service checks performance and efficiency. If you want both, we offer a combined gas safety check and boiler service in a single visit.

For landlords in the private rented sector, a valid CP12 is one of the most critical compliance documents you hold. Gas appliances that are not regularly inspected can develop faults that lead to carbon monoxide poisoning — a serious and potentially fatal risk. The annual inspection is your primary defence against that risk, and the CP12 is the evidence that you have met your legal duty of care.

Gas safety legal requirements for landlords

The Gas Safety (Installation and Use) Regulations 1998 place specific obligations on every landlord who provides gas appliances in a rental property. The regulations apply to all privately rented properties — assured shorthold tenancies, periodic tenancies, HMO licences, houses in multiple occupation and student lets alike. There is no minimum tenancy length: even short-term lets require a valid CP12.

The gas safety check must be carried out by an engineer who is registered on the Gas Safe Register. It is a criminal offence to carry out gas work — including safety inspections — without Gas Safe registration. Landlords have no discretion on this point: only a Gas Safe Registered engineer can sign and issue a valid CP12 certificate.

The regulations apply to England, Wales and Scotland. Northern Ireland has separate gas safety legislation — if your rental property is in Northern Ireland, check with the relevant local authority.

Gas Safety Certificate pricing

Fixed pricing per number of gas appliances. The price you see is the price you pay — no call-out charges, no hidden fees. Most domestic rental properties have 1 gas appliance (the boiler), priced at £49.99. Properties with a boiler, hob and gas fire cost £69.99 for all three.

Want a detailed breakdown of Gas Safety Certificate costs? See our full Gas Safety pricing guide →

Need a commercial gas safety certificate for a business premises? See commercial CP42 pricing →

Comparing all landlord certificate prices? View our complete pricing page →

What's included for £49.99

Every CP12 inspection covers all required safety checks for each gas appliance included in the tenancy, at no extra cost beyond the price shown.

• Inspection of all gas appliances included in the tenancy (boiler, hob, gas fire)
• Flue integrity and terminal position check for each appliance
• Ventilation adequacy check — ensuring correct air supply for combustion
• Gas pressure and flow rate tests at every appliance
• Safety device checks — thermostats, flame failure devices, overheat cut-outs
• Gas tightness test on accessible pipework
• Signed CP12 certificate listing every appliance and its result
• Certificate emailed the same day — ready to forward to your tenant

What the Gas Safe engineer checks

A CP12 inspection is more thorough than a visual check. The engineer works to a defined checklist for each appliance and records the result of every test on the certificate.

How to book your landlord gas safety certificate

Booking a CP12 takes under 3 minutes. Next-day appointments available across all 32 London boroughs and the wider South East.

1. 01

   Book online

   Choose your appliance count, pick a date and pay securely online. Next-day slots available across London and the South East — no phone calls required. You'll receive a booking confirmation immediately.

2. 02

   Gas Safe engineer visits

   A Gas Safe Registered engineer arrives at your agreed time and carries out the full CP12 inspection. You don't need to be present — a tenant, keyholder or letting agent can provide access. The inspection typically takes 30–90 minutes.

3. 03

   Certificate emailed same day

   Your signed CP12 gas safety certificate is emailed to you on the day of the inspection, usually within a few hours of the engineer completing. Forward it to your tenant straight away to meet your 28-day obligation.

We cover all 32 London boroughs and the wider South East. Check if we cover your area →

Why Gas Safe registration matters

The Gas Safe Register is the official list of gas engineers legally qualified to work on gas appliances in Great Britain. Appointed by the Health and Safety Executive (HSE), it replaced CORGI in April 2009. Every engineer on the register carries a Gas Safe ID card showing their name, registration number and the specific appliance types they are qualified to work on.

It is a criminal offence for any person who is not Gas Safe registered to carry out gas work — including safety inspections. A CP12 signed by an unregistered engineer is not legally valid, and a landlord relying on such a certificate remains in breach of the Gas Safety (Installation and Use) Regulations 1998. Every engineer who carries out our CP12 inspections is Gas Safe registered — you can verify their credentials on the Gas Safe Register engineer search.

When you book through My Landlord Certificate, your engineer's registration number appears on the CP12 certificate itself. Your letting agent, mortgage lender or local authority can verify the registration at any time — giving you an auditable, legally watertight record of compliance.

See what landlords say about our gas safety service on our reviews page →

Gas Safety Certificate — frequently asked questions

More questions about gas safety for landlords? See our full FAQ →