Landlord Gas Safety Certificate (CP12) Guide for West and North West London

If you let a property with gas in it, the annual gas safety check is a legal duty. This guide explains what a CP12 covers, the deadlines that matter, how the 2026 tenancy changes affect landlords and what to expect when arranging a local check.

What is a CP12 / landlord gas safety certificate?

“CP12” is the old CORGI form number for what’s now called the Landlord Gas Safety Record (LGSR). The name stuck. Landlords, letting agents and engineers still say CP12 certificate, and it means the same thing. The record is what a Gas Safe registered engineer issues after carrying out the annual gas safety check the law requires on rented homes.

The record confirms that each gas appliance the landlord provides, the boiler, gas hob or gas fire, and its flue has received the required safety checks. It lists what was checked, any defects found, what action was taken and whether each appliance was safe to use. Your tenant gets a copy. You keep one for your records.

Installation pipework is different. HSE says it is not formally covered by the annual gas safety check, although landlords must maintain it safely and HSE recommends asking the engineer to test the whole gas system for soundness and visually examine accessible pipework. Although that complete-installation test is not the statutory CP12 minimum, we carry it out on every gas-related attendance because the safety of our work and the customer’s gas installation matters.

Who needs a landlord gas safety certificate?

You need one if you let a property containing gas appliances and flues that you, as landlord, provide for the tenant. That covers the great majority of private lets we look after across Queen’s Park, Kilburn and Maida Vale, flats, terraces and HMOs alike:

• Privately rented houses and flats, including most assured periodic tenancies in England.
• Rooms let in shared houses and HMOs.
• Short-term and holiday lets.
• Properties managed by a letting agent on your behalf. The duty can be delegated to the agent in writing, but the check still has to happen.

One carve-out. If an appliance belongs to the tenant, their own gas cooker, for example, the tenant is responsible for that appliance and any flue serving only that appliance. You remain responsible for maintaining the associated installation pipework safely. (If you are supplying new cooking appliances for tenants, our Gas Safe engineers also carry out gas cooker and hob installations).

How often do you need a CP12?

Every 12 months. The law requires an annual gas safety check on all relevant appliances and flues, carried out by a Gas Safe registered engineer. No exceptions for newer boilers or recently checked properties.

There’s one helpful flexibility, introduced in April 2018. You can have the check done up to two months early and keep your original renewal date. It works like an MOT. Renewing ahead of the deadline doesn’t reset the clock against you. In practice, that means you can book the next CP12 certificate comfortably before the current one expires and never risk a gap in cover, even across tenancy changes.

What does a gas safety check involve?

A Gas Safe registered engineer inspects each landlord-provided gas appliance and flue to confirm it is operating safely. On every visit, our standard inspection covers:

If something fails, it goes on the record with advice on the fix. Where there’s an immediate danger, the engineer may disconnect the appliance (with permission) to keep everyone safe. HSE says the record should still be issued when the checks finish. It records the results rather than acting as a simple pass certificate and should not be delayed until remedial work is complete. Keep any follow-up repair records with it. Repairs are separate work. We handle those under boiler repairs.

CP12 certificate vs a boiler service, what’s the difference?

The question landlords ask us most, and the distinction matters. A CP12 certificate is a safety check, a boiler service is maintenance. One keeps you legal. The other keeps the boiler reliable. They’re not interchangeable.

Many landlords sensibly book both on the same visit. The annual boiler service supports reliability, while the safety check keeps you compliant. Many manufacturer guarantees require annual servicing in accordance with their terms, so check the guarantee documents for the specific boiler. One appointment, both jobs handled before winter.

Your legal duties as a landlord, at a glance

The check itself is only half the job. The Gas Safety (Installation and Use) Regulations 1998 also set out what you must do with the record:

An electronic record is acceptable if it can be reproduced as a hard copy, is protected from loss or interference, and uniquely identifies the engineer. With the landlord’s agreement, the engineer can send it directly to a tenant who is happy to receive it electronically. The HSE landlord gas-safety guidance explains those conditions.

What if the tenant will not provide access?

A landlord must take all reasonable steps to arrange the safety check but must not force entry. HSE recommends keeping a record of correspondence, leaving a notice after an attempted visit and writing to explain the legal requirement while offering the tenant another appointment. Its inspectors will look for repeated efforts, including at least three attempts, although only a court can decide whether the steps were reasonable in a particular case.

The practical answer is to start before the renewal deadline, keep every email, message and appointment record, and make access arrangements clear in the tenancy agreement. See the HSE guidance on tenant access for the regulator’s current advice.

What happens if you don’t have a valid CP12?

Failing to meet the gas safety duties is a criminal offence. The Health and Safety Executive (HSE) enforces the regulations and can prosecute non-compliant landlords. Penalties can include substantial fines and, in the most serious cases, imprisonment. Behind the legal risk sits the real one. An uninspected gas appliance can expose your tenants to carbon monoxide poisoning or a gas leak.

What changed for private landlords in England in 2026?

From 1 May 2026, most existing assured shorthold tenancies in England became assured periodic tenancies, new assured private tenancies are periodic, and Section 21 possession notices were abolished. These changes did not remove the landlord’s annual gas-safety duties. Relevant landlord-provided appliances and flues still need their check every 12 months, with the record supplied to tenants on time.

The practical point is simple. Do not let the tenancy reforms distract from the CP12 renewal date. This section applies to England. Renting rules differ in Wales and Scotland. See the current GOV.UK Renters’ Rights guidance for the tenancy changes.

How much does a landlord gas safety certificate cost?

Our transparent fixed pricing for a Landlord Gas Safety Certificate (CP12) is £79 fixed for 1 gas appliance, plus £35 for each additional gas appliance across West and North West London.

We give landlords a clear, fixed price. No call-out games, no surprise add-ons on the invoice. For a fixed quote for your rental, see our landlord gas safety certificate service page or get in touch.

Frequently asked questions

What is a CP12 certificate?

A CP12 is the common name for the Landlord Gas Safety Record (LGSR). It records annual checks on landlord-provided gas appliances and their flues. Installation pipework has a separate maintenance duty. Although it is not part of the statutory CP12 minimum, we gas-tightness-test the complete installation on every gas-related attendance as our safety standard.

How often does a landlord need a gas safety check?

Every 12 months. The law requires an annual gas safety check on all relevant gas appliances and flues by a Gas Safe registered engineer. Since April 2018 you can have it done up to two months early and keep the same renewal date, so staying covered costs you no time.

Is a CP12 the same as a boiler service?

No. A CP12 certificate records the legally required safety checks on relevant landlord-provided gas appliances and their flues. A boiler service is maintenance carried out to the manufacturer’s instructions. They are separate jobs, although landlords often book both for one visit. The check supports compliance. The service supports the boiler’s reliability.

Do I need a gas safety certificate to rent out my property?

Yes. If your rental has gas appliances or flues you provide for tenants, you must arrange the annual checks and give tenants the record. Installation pipework has a separate maintenance duty. These gas-safety duties apply to flats, houses, HMOs and many holiday lets across England, Wales and Scotland.

What happens if I don’t have a valid CP12?

Failure to meet the gas-safety duties is a criminal offence and may lead to HSE enforcement or prosecution. More importantly, an unchecked appliance can expose tenants to gas leaks or carbon monoxide. Keep current records as evidence that your safety responsibilities have been met.

How much does a CP12 cost?

Our Landlord Gas Safety Certificate is £79 fixed for 1 gas appliance across West and North West London, plus £35 for each additional gas appliance (such as a gas hob, cooker or gas fire). General UK budgeting averages typically range between £60 and £120 depending on property size and appliance count.

Are you Gas Safe registered?

Yes. The Happy Heating Co is Gas Safe registered (657972). Every gas safety check and CP12 certificate is carried out by a qualified, fully insured domestic gas engineer, and we issue your certificate digitally so your records, and your tenant’s copy, are easy to keep on file.

Need a CP12 for your rental property?

Tell us about your property and we’ll book in your CP12 certificate. A clear fixed price, a digital certificate, and your tenant’s copy handled for you.

• WhatsApp us. Book in 60 seconds
• Call 020 8051 2124. Our line is answered 24/7 and we’ll get your details to an engineer
• See our services: landlord gas safety certificate (CP12) · gas cooker & hob installation

We’re Gas Safe registered (657972) and look after landlords across West and North West London. Heating that just works, no drama.