Gas safety for landlords — what you're legally required to do (UK 2026)

Gas safety is one of the few areas of landlord law where the consequences of getting it wrong extend beyond fines and civil liability to criminal prosecution and, in the worst cases, the deaths of tenants. Every year in the UK, people die from carbon monoxide poisoning caused by faulty or poorly maintained gas appliances. The law places the responsibility for preventing this squarely on landlords — and the obligations are not complicated. This guide explains exactly what you are legally required to do, what the Gas Safety Record must contain, what your tenants are entitled to, and what happens if you fail to comply.

The legal requirement

The Gas Safety (Installation and Use) Regulations 1998 impose a legal duty on landlords to ensure that all gas appliances, flues and associated pipework provided for tenants' use are maintained in a safe condition. The core obligation is straightforward: every gas appliance and flue at the property must be checked by a Gas Safe registered engineer at least once every 12 months.

The regulations apply to all residential lettings in England, Wales and Scotland where gas appliances are provided. This includes houses, flats, HMOs, holiday lets and rooms in shared accommodation. It does not apply to appliances that belong to the tenant — but if the tenant's appliance is connected to your gas installation, you still have a duty to ensure the pipework and flue serving it is safe.

The duty to arrange and pay for the annual gas safety check falls on the landlord, not the tenant. You cannot pass this cost to the tenant, and you cannot make the annual check conditional on the tenant arranging access — if a tenant refuses access, you must be able to demonstrate you took reasonable steps to gain it.

Who can carry out a gas safety check

Only a Gas Safe registered engineer can legally carry out a landlord gas safety check and issue a Gas Safety Record. The engineer must be registered for the appliance categories they are checking — a domestic natural gas registration covers most standard residential appliances (boilers, gas fires, cookers), but LPG appliances require a separate registration category.

You can verify whether an engineer or business is Gas Safe registered at gassaferegister.co.uk or by calling 0800 408 5500. The engineer's Gas Safe ID card will list the appliance categories they are qualified to check. Always ask to see this card before work begins — a legitimate Gas Safe engineer will always carry it and will not object to showing it.

Using an unregistered engineer to carry out a landlord gas safety check is itself a criminal offence, in addition to the check being invalid. If an unregistered engineer carries out a check and a gas incident subsequently occurs at the property, both you and the engineer face serious legal exposure.

What the CP12 must include

The Gas Safety Record — commonly called the CP12, after the check form number — is the written record of the annual gas safety check. The Regulations specify exactly what it must contain. A valid CP12 must include:

• The address of the property where the check was carried out
• The date the check was carried out
• The name, Gas Safe registration number and signature of the engineer who carried out the check
• A description of each appliance and flue checked
• The location of each appliance
• Whether each appliance was found safe or unsafe
• Details of any defects found and action taken (or required)
• The name and address of the landlord (or agent acting for the landlord)

If any appliance is found to be immediately dangerous, the engineer is required to disconnect it and label it accordingly. If an appliance is “at risk” — not immediately dangerous but with a defect that could become dangerous — the engineer must advise the owner of the nature of the defect and recommend that it is repaired. As landlord, you are responsible for ensuring any such defects are rectified promptly.

Tenant rights to see the CP12

Tenants have a statutory right to receive a copy of the Gas Safety Record. The rules on when you must provide it are specific:

• For existing tenants: you must provide a copy of the new CP12 within 28 days of each annual check being completed.
• For new tenants: you must provide a copy of the most recent CP12 before they move in (not after — before).
• For prospective tenants: if a prospective tenant asks for a copy of the CP12 before signing a tenancy agreement, you must provide it.

You must keep a copy of each Gas Safety Record for at least two years after the date of the check. If you use an agent to manage the property, the obligation still falls on you as landlord unless you have formally delegated it in writing to the agent — and even then, a court would likely hold you jointly responsible if the agent failed to comply.

Penalties for non-compliance

Non-compliance with the Gas Safety Regulations is a criminal offence. The Health and Safety Executive (HSE) is responsible for enforcement, and it takes gas safety seriously. The penalties available to the courts are:

• An unlimited fine for each offence (each missed annual check, each failure to provide a CP12 to a tenant, can be a separate offence)
• Up to six months' imprisonment
• Both a fine and imprisonment in serious cases

In practice, fines of £6,000 or more are common for straightforward non-compliance — a landlord who simply failed to arrange the annual check. Where a gas incident has caused injury or death and the landlord was non-compliant, fines run into six figures and imprisonment is a real possibility.

There is also a significant civil liability risk. If a tenant suffers injury from a gas leak or carbon monoxide poisoning at a property where the annual check was overdue or the CP12 was not provided, the landlord faces personal injury claims that often far exceed the cost of any fine. Public liability insurance will typically cover these claims, but many insurers have exclusion clauses for regulatory non-compliance — meaning a landlord who failed to arrange the annual check may find themselves uninsured.

Finally, non-compliance with gas safety obligations can affect a landlord's ability to serve a Section 21 notice to end a tenancy. Courts have held that landlords who have not complied with their gas safety obligations cannot rely on the “no-fault” eviction procedure until compliance is restored.

The 12-month reminder system every landlord needs

The most common cause of non-compliance is not deliberate — it is simply losing track of renewal dates across multiple properties. A landlord with five properties, each with a different check anniversary, needs a reliable reminder system that prompts action at least six weeks before each deadline. Six weeks gives you time to book the engineer, coordinate tenant access, and deal with any delays without breaching the 12-month requirement.

Your reminder system should trigger at least twice: once at six weeks before the deadline (to book the engineer) and once at two weeks before (to confirm the appointment is in the diary). If you are managing through an agent, your system should independently track the deadlines — do not rely entirely on the agent to alert you.

When a new property joins your portfolio, set the first reminder the moment you take ownership or management — not when the first check is due. If the previous owner's most recent CP12 is less than 12 months old, that check remains valid, but you should still verify it is on your tracking system and that the next renewal is scheduled.

Choosing a Gas Safe engineer

For landlords with multiple properties, reliability and documentation quality matter far more than price. The engineer who arrives when booked, produces a clear and complete CP12, and flags any maintenance issues before they become compliance problems is worth significantly more than one who is marginally cheaper but hard to schedule or produces poor paperwork.

When assessing a Gas Safe engineer or heating company for landlord work, ask specifically:

• Do they have experience of landlord certificates across multiple properties?
• Can they issue digital CP12 certificates sent directly to both landlord and tenant?
• Can they track renewal dates across your portfolio and prompt you ahead of each deadline?
• What is their policy if a tenant refuses access?
• Do they provide a written report if appliances are found to require maintenance?

A good landlord gas safety engineer builds a recurring relationship rather than treating each certificate as a one-off transaction. The best ones have their own reminder systems and will contact you proactively ahead of each renewal.

Trade2Base for landlord portfolio management

For Gas Safe engineers and heating businesses who service landlord portfolios, Trade2Base makes the annual certificate cycle systematic. Each property in your client's portfolio can be stored as a separate site record, with the CP12 expiry date tracked and automated reminders sent to both you and the landlord ahead of each renewal.

Gas Safety Records are generated directly from job records in Trade2Base, pre-populated with your Gas Safe registration number, the engineer's details, the appliance information recorded during the check, and the property and landlord details. The completed CP12 is automatically sent to the landlord and, if required, directly to the tenant — meeting the 28-day requirement without any additional admin step.

Landlords who work with engineers using Trade2Base have a complete, timestamped record of every certificate issued, every property checked, and every renewal date — accessible at any time. For landlords who want to demonstrate compliance to a letting agent, mortgage lender, or the HSE, that record is exactly what is needed.