If you let a property with any gas appliance, you must have it checked every year by a Gas Safe registered engineer and give your tenant the record. It is one of the simplest landlord obligations to meet and one of the most serious to get wrong: there is no grace period, failure is a criminal offence, and a missing record can now sink a possession claim. This guide sets out exactly what the rules are.
Keeping a provable record of every certificate matters more than ever. See how VoxaMTD records compliance
What the certificate is
The document most landlords call a "gas safety certificate" or "CP12" is formally the Landlord Gas Safety Record, required under the Gas Safety (Installation and Use) Regulations 1998. CP12 is just the old form number that stuck. A Gas Safe registered engineer inspects your gas appliances, pipework, and flues, confirms they are safe, and produces the record listing each appliance, the result, any defects, and their Gas Safe registration number.
It covers every gas appliance and flue you provide as the landlord. Appliances the tenant owns are not your responsibility to check, though you remain responsible for the connecting pipework. It applies to any property let under a tenancy, including HMOs and short-term holiday lets, which catches out landlords running Airbnb or serviced accommodation who assume the rules do not apply to them. They do.
The rules, in plain terms
There are five obligations, and they are not negotiable:
- Annual check. Every gas appliance and flue must be checked at intervals of no more than 12 months by a Gas Safe registered engineer. Only an engineer registered for that appliance type can do it, and verifying their registration is your responsibility, not theirs. You can check any engineer on the Gas Safe Register.
- The 28-day tenant rule. You must give existing tenants a copy of the record within 28 days of the check. New tenants must receive it before they move in, not after. "Available on request" does not meet the requirement; the tenant has to actually receive a copy. Email is fine if the tenant has agreed to receive documents that way.
- Keep records for at least two years. The record must be retained and made available to a Health and Safety Executive officer on request.
- Act on defects. If the engineer marks an appliance "At Risk" or "Immediately Dangerous", you have a duty to arrange repair. An Immediately Dangerous appliance is disconnected on the spot. Do not hold back the record from the tenant while remedial work is outstanding.
- Maintain, not just inspect. The annual check is separate from your ongoing duty to keep appliances safe. If a tenant reports a gas smell or a faulty appliance, you must arrange a prompt repair regardless of when the last check was.
The two-month renewal window
A point of genuine confusion worth getting right. Since a 2018 amendment, you can carry out the annual check up to two months before the current certificate expires without losing the original expiry date. So if your record expires on 1 September, you can have the check done any time from 1 July and still keep 1 September as your renewal anchor for next year. This gives you a sensible buffer to book the engineer. Outside that window, any gap over 12 months is a breach.
Why this now matters for possession
Gas safety used to be tied to Section 21: a missing certificate made a no-fault eviction notice invalid. Section 21 was abolished on 1 May 2026, but this did not make gas safety less important for possession. It made it more so.
Every eviction now runs through Section 8, which is evidence-based, and your gas safety position can be used against you in court. To bring a sound possession claim you want to be able to show that the tenant received a valid certificate at the start of the tenancy, received each annual renewal within the 28-day window, and that there is a continuous, unbroken chain of records. If you cannot prove service, especially of the first certificate, your position is weak. This is the part that catches diligent landlords out: they had the certificates, they just cannot prove the tenant received each one on time, years after the fact.
This is exactly the gap a provable compliance record closes. A reminder app tells you a CP12 exists; it does not prove when you served it. How VoxaMTD proves service
The penalties
There is no single fixed fine, and the figures vary by enforcement route, which is itself a reason not to gamble. Failing to maintain gas safety is a criminal offence. The HSE can prosecute, and the courts can impose an unlimited fine and up to two years' imprisonment, with manslaughter charges possible in the worst cases where a tenant is harmed. Local councils can issue civil penalties for housing breaches running to tens of thousands of pounds. On top of the legal exposure, a gas-related incident without a valid certificate can void your landlord insurance, leaving you to cover the loss yourself.
Set against a check that costs roughly £60 to £100 a year, non-compliance is one of the worst risk-to-reward trades in property.
This guide is general information about gas safety obligations for landlords in England and is not legal advice. Rules are based on HMRC and HSE guidance current at the time of writing; check GOV.UK and the Gas Safe Register, or take advice, for your own circumstances.