Cardiff · Wales
Gas safety certificate (CP12) in Cardiff
What you need: A yearly gas safety check of the gas appliances and flues you provide, by a Gas Safe registered engineer, with a copy of the record (CP12) for the contract-holder.
How often: Every year: a gas safety check by a Gas Safe registered engineer.
Free to use · No sign-up · Always check their registration before you book · Search another town or postcode
Request a gas safety certificate in Cardiff
No gas safety engineer listed for Cardiff yet. Tell us what you need and we'll find you a registered gas safety engineer, free.
Request a gas safety certificate in Cardiff
Opens your email app with a short template (address, property type, date needed), addressed to [email protected].
Or check a gas safety engineer yourself
- Gas Safe Register: search the engineer's name or licence number and check the ID card shows the work they're doing for you
Only a Gas Safe registered engineer may legally work on gas appliances. These are public registers; we're not part of them and they don't endorse us.
Local tips for Cardiff
Mostly mains gas round here
Most homes in Cardiff run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, Cardiff: 78.4% mains gas onlyBusy rental market: book early
Lots of people rent in Cardiff, so if you're letting, book a few weeks before a tenancy starts or renews. No last-minute panic.
Where's this from?
ONS Census 2021, Cardiff: 24.3% private rented vs 17.0% Wales🤓 Did you know? (Cardiff edition)
Cardiff had a population of 381,516 in 2025 and forms a principal area officially known as the City and County of Cardiff.
The city is the eleventh largest in the United Kingdom.
Lots of purpose-built flats round here. Check whether the job covers just your flat or the shared areas too.
Source: ONS Census 2021 (TS044): 20.2% purpose-built flats vs 9.4% Wales
Landlord rules in plain English (Wales)
- Every year: a gas safety check by a Gas Safe registered engineer.
- CO alarm: needed where there's a gas, oil or solid fuel appliance.
- Register: with Rent Smart Wales.
The fuller version
Since 1 December 2022 most private tenancies in Wales are 'occupation contracts' under the Renting Homes (Wales) Act 2016.
Private landlords and agents in Wales must register (and, if managing, be licensed) with Rent Smart Wales.
Annual gas safety checks by a Gas Safe registered engineer are required, and the Fitness for Human Habitation regulations require a carbon monoxide alarm where there is a gas, oil or solid fuel appliance.
Rules differ in England, Wales, Scotland and Northern Ireland, and they do change. This is a friendly summary, not legal advice. Double-check on GOV.WALES.
Your corner of Cardiff
Also covering: CF3, CF11, CF15, CF23, CF24, CF30, CF91, CF95, CF99
Nearby towns
Other checks in Cardiff
Free landlord resources
Letting in Cardiff? Our free, sourced guides for Wales:
Frequently asked questions
Do landlords in Cardiff need a gas safety certificate?
Yes. Rented homes need a gas safety check every year by a Gas Safe registered engineer, with a copy for the contract-holder. (Summary only; check the official guidance.)
Which postcode districts are in Cardiff?
12 active postcode districts use the Cardiff post town, from CF3 to CF99 (ONS Postcode Directory via Doogal). District pages on this site: CF10, CF14, CF5.
Nobody covers my part of Cardiff yet. Where else can I look?
The nearest other towns we list are Bristol (~25 miles), Swansea (~34 miles), Exeter (~55 miles), measured straight-line between OS Open Names centres. A gas safety engineer based there may travel, so ask.
How many homes in Cardiff are privately rented?
24.3% of 147,333 households rented privately at the 2021 Census (ONS TS054); 17.2% rented from a council or housing association.
📊 The numbers behind this page
- Households heated by mains gas only (Cardiff local authority)
- 78.4% Source: ONS Census 2021 (TS046)
- Households on tank/bottled gas only (Cardiff local authority)
- 0.6% Source: ONS Census 2021 (TS046)
- Households on oil heating only (Cardiff local authority)
- 0.1% Source: ONS Census 2021 (TS046)
- Households with no central heating (Cardiff local authority)
- 1.4% Source: ONS Census 2021 (TS046)
- Households on district/communal heat networks (Cardiff local authority)
- 0.3% Source: ONS Census 2021 (TS046)
- Households privately renting (Cardiff local authority)
- 24.3% Source: ONS Census 2021 (TS054)
- Population (GeoNames gazetteer)
- 372,089 Source: GeoNames, CC BY 4.0
- Active postcode districts with this post town
- 12 Source: Doogal / ONS Postcode Directory
- Local authority
- Cardiff Source: postcodes.io (ONSPD)
- Region / nation
- Wales Source: OS Open Names via postcodes.io
- Nearest listed town
- Bristol (~25 miles) Source: Calculated from OS Open Names coordinates
Made with open data. See where it all comes from. Updated 23 October 2026.