Mountain Ash · CF45
Gas safety certificate in CF45 (Mountain Ash)? We'll point you the right way.
Covering Mountain Ash, Abercynon, Penrhiwceiber, including Penrhiw-ceibr. Find Gas Safe registered engineers nearby.
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Request a gas safety certificate in CF45 (Mountain Ash)
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Request a gas safety certificate in CF45 (Mountain Ash)
How to check a gas safety engineer is registered: see the Mountain Ash page.
CF45 (Mountain Ash) in a nutshell
CF45 covers Mountain Ash, Abercynon, Penrhiwceiber, in Rhondda Cynon Taf. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for CF45
Rhondda Cynon Taf council area
CF45 is in Rhondda Cynon Taf's area. Some councils run their own landlord licensing, so it's worth checking theirs.
Where's this from?
postcodes.io (ONSPD) local authorityGive your full postcode
CF45 stretches across Abercynon, Mountain Ash, Penrhiw-ceibr, so give your full postcode, not just 'CF45', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsMostly mains gas round here
Most homes in Mountain Ash run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, Mountain Ash: 85.7% mains gas onlyWales landlord rules: quick version
- 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.
More detail on the Mountain Ash page. Always double-check on GOV.WALES.
Next door to CF45
Frequently asked questions
Which areas does CF45 cover?
CF45 (Mountain Ash, Abercynon, Penrhiwceiber) includes the wards of Abercynon, Mountain Ash, Penrhiw-ceibr (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to CF45?
Neighbouring districts include CF46 (Treharris), CF48 (Cyfarthfa), CF47 (Merthyr Tydfil), CF37 (Pontypridd), CF43 (Ferndale) (ONS Postcode Directory via Doogal). A pro covering CF45 may well cover these too, so it's worth asking.
How many homes are in CF45?
About 8,405 households and 19,550 residents at the 2011 Census, across 437 active postcodes (Doogal / ONS Postcode Directory).
Which council area is CF45 in?
CF45 sits in Rhondda Cynon Taf (postcodes.io). Parliamentary constituency: Merthyr Tydfil and Aberdare, Pontypridd.
📊 The numbers behind this page
- Postcode district
- CF45 1
- Areas covered
- Mountain Ash, Abercynon, Penrhiwceiber 2
- Active postcodes
- 437 3
- Households (2011 Census, via Doogal)
- 8,405 2
- Population (2011 Census, via Doogal)
- 19,550 2
- Electoral wards
- Abercynon, Mountain Ash, Penrhiw-ceibr 4
- Parliamentary constituencies
- Merthyr Tydfil and Aberdare, Pontypridd 4
- Local authority
- Rhondda Cynon Taf 4
- Households heated by mains gas only (Mountain Ash built-up area)
- 85.7% 5
- ONS Postcode Directory
- Doogal
- Doogal / ONSPD
- postcodes.io
- ONS Census 2021
Made with open data. See where it all comes from. Updated 26 October 2026.