Plain answers · landlords

Landlord gas safety in Wales: CP12 rules without the jargon

If you let property in Wales, the gas safety rules are not optional and the Welsh rules now go further than the English ones. Here is what you are actually required to do, explained by a Gas Safe registered engineer who issues these certificates every month.

LMB Plumbing and Heating Limited
Lloyd Bargery
Gas Safe registered engineer, Pencoed · 11 June 2026

The annual check is the law everywhere in Britain

Under the Gas Safety (Installation and Use) Regulations 1998, every landlord must have the gas appliances, flues and pipework they provide checked every 12 months by a Gas Safe registered engineer. The record of that check is what everyone calls the CP12, the landlord gas safety record. You must give a copy to your existing tenants within 28 days of the check, give new tenants a copy before they move in, and keep records for at least two years.

Only a Gas Safe registered engineer can carry out the check. Ask to see the engineer’s Gas Safe ID card, every registered engineer carries one, or look the business up on the Gas Safe Register before they arrive.

What Wales adds on top

Welsh tenancies now run under the Renting Homes (Wales) Act, which converted tenancies into occupation contracts and requires every rented home to be fit for human habitation. The supporting regulations from 2022 spell out what that means in practice, and for gas landlords two points matter most: working smoke alarms are required, and carbon monoxide alarms are required where there are gas appliances. A missing CO alarm in a room with a gas boiler or fire is no longer just bad practice in Wales, it cuts against your fitness-for-habitation duties.

None of this replaces the 1998 gas regulations. The annual CP12 duty and the Welsh habitation rules sit side by side, and a serious landlord simply complies with both.

The painless way to run it

The efficient pattern LMB sets up for local landlords is one visit per property per year: the CP12 check and the annual boiler service done together. The service keeps the boiler’s manufacturer warranty valid and catches faults while they are small, the CP12 keeps you legal, and the tenant only has to be home once. Lloyd handles the paperwork on the day and you get the records for your file.

If your properties are around Bridgend, Pencoed, Porthcawl, Cardiff or the Vale, you can message Lloyd on WhatsApp or call 07712 646488 and sort dates for the whole portfolio in one conversation. Lloyd works with single-property landlords and small portfolios across the county, and the 5.0 Google rating applies to the rental work just as much as the owner-occupier jobs.

Want it looked at properly?

Lloyd answers his own phone during working hours, and the online tool gives you a fixed boiler price in about 90 seconds. No call centre, no pressure.

Questions people ask

What actually gets checked for a CP12?

Each gas appliance the landlord provides, plus the flues and accessible pipework: combustion performance, gas tightness, safety devices, ventilation and flue operation. Appliances the tenant owns are not covered, though the pipework feeding them is.

When should I book the renewal?

You can have the check done in the two months before the current record expires and keep the original expiry date, so book early rather than risk running past the deadline. Lining it up with the annual boiler service in the same visit is the efficient way.

Do I need a carbon monoxide alarm in my Welsh rental?

Where there are gas appliances, yes. The fitness for human habitation regulations under the Renting Homes (Wales) Act require working smoke alarms and carbon monoxide alarms in Welsh rented homes. They are cheap, and fitting them is trivial next to the consequences of not having them.

What happens if I just do not bother?

Letting without valid gas safety records is a criminal matter under the 1998 regulations, it can void your landlord insurance, and in Wales it undermines your fitness-for-habitation position under the occupation contract. It is also the kind of corner that gets tenants hurt. Do not be that landlord.

From his Google profile, not a stock library

The work behind the advice

Lloyd Bargery standing in front of his sign-written LMB Plumbing and Heating van
Lloyd and the LMB van. The engineer who quotes is the engineer who turns up.
Worcester combi boiler installed by Lloyd, dated commissioning sticker visible on the case
A combi install with the dated LMB commissioning sticker on the case.
New brass outdoor tap fitted to a brick wall by Lloyd, old tap alongside
New outdoor tap plumbed and fitted, old one ready to come off.
★★★★★5.0 from 197 Google reviewsQuoted verbatim from LMB’s public Google profile.
Lloyd is genuinely a top top plumber. Knows his stuff and has always offered his services at a reasonable price. He has also managed to squeeze us in at short notice.
Kieran Jones · April 2026 · Google review
Professional and reliable as ever, wouldn't use anyone else!!!!
Ian Walters · March 2026 · Google review
Hired Lloyd to carry out a boiler service and outdoor tap replacement. Very punctual, polite. Even giving our dog buddy a fuss. No mess or delays.
Oliver Rees · March 2026 · Google review