Landlord gas safety certificate rules, explained
The landlord gas safety certificate rules come down to one annual duty with strict paperwork around it. If you let a property with gas appliances, a Gas Safe registered engineer must check them every 12 months, and the record of that check, usually called a CP12, has to reach your tenants on a set timetable. The rules come from the Gas Safety (Installation and Use) Regulations 1998, and they are enforced as criminal law rather than as a tenancy formality, so this is one piece of admin worth getting exactly right.
Who needs a certificate
If the property you let has a gas boiler, cooker, fire, water heater or gas pipework, the rules apply. That covers assured shorthold tenancies, houses in multiple occupation, holiday lets and rooms let to lodgers. An appliance the tenant owns and brought with them is not part of your check, but the installation pipework that supplies it remains your responsibility. A property with no gas supply at all needs no certificate, though you would still want an electrical report and working alarms.
There is no DIY route here. The check must be carried out by a Gas Safe registered engineer, and you can verify any engineer’s registration and the work they are qualified for on the Gas Safe Register before they arrive.
What the engineer checks
The annual check covers every appliance and flue you provide. The engineer tests the pipework for gas tightness, checks each appliance is burning correctly and at the right operating pressure, confirms flues are pulling combustion products out of the building, checks ventilation is adequate and makes sure safety devices cut in as they should. The record lists the property, each appliance, any defects found and the engineer’s Gas Safe registration number.
The three paperwork rules that catch landlords out
- Existing tenants must receive a copy of the record within 28 days of the check.
- New tenants must receive it before they move in, at the start of the tenancy.
- You must keep each record until two more checks have been done on that appliance or flue, which is about two years. If an appliance or flue is removed, keep its last record for two years from the date of that check. Keeping them longer costs nothing and settles disputes quickly.
The renewal window works like an MOT
Since 2018 the regulations have allowed an MOT style renewal. Have the next check done any time in the 10 to 12 months after the last one and it is treated as if it were done on the expiry date, so your renewal date stays fixed year after year. Book earlier than 10 months and the clock resets to the new date. Book later and you have a gap, and a period without a valid record is a breach. The window exists to remove any excuse for drift: you can book weeks ahead, work around tenant access and never lose a day off the certificate.
What happens if an appliance fails
A failed appliance does not void the visit. The engineer classifies the fault, and anything judged at risk or immediately dangerous is turned off, with the tenant’s or landlord’s permission, and must not be used until a Gas Safe registered engineer has made it safe. The defect is written on the record, and your job is to get it fixed promptly and keep the paper trail. If a tenant ever reports a smell of gas, the first call is the National Gas Emergency Service on 0800 111 999, before any contractor.
Keeping a portfolio manageable
With one property this is a diary entry. With ten, spread across different tenancies and renewal dates, it becomes a genuine admin load, and the practical fix is to put the whole portfolio with one firm so every renewal date is tracked in one place and booked inside the 10 to 12 month window. Neos Engineering carries out CP12 checks for landlords and letting agents across all of London. Our office books each visit, our engineers can arrange access directly with tenants, and the certificate you have to keep and share reaches your file without chasing.
The short version
One check a year by a Gas Safe registered engineer. Record to sitting tenants within 28 days, to new tenants before move in, and kept on file until two more checks have been done. Renew in months 10 to 12 and the expiry date never moves. Fix any defect before the appliance is used again, and treat any smell of gas as a 0800 111 999 call first.
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