Mountain Ash · CF45

EPC in CF45 (Mountain Ash)? We'll point you the right way.

Covering Mountain Ash, Abercynon, Penrhiwceiber, including Penrhiw-ceibr. Find accredited domestic energy assessors nearby.

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Request an EPC in CF45 (Mountain Ash)

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Request an EPC in CF45 (Mountain Ash)

How to check an EPC assessor is registered: see the Mountain Ash page.

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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

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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 authority
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Give 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) wards
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Terrace and semi country

Most homes here are terraces or semis. Insulation and heating upgrades are the usual way to nudge a rating up, so have receipts ready.

Where's this from?ONS Census 2021, Mountain Ash: 65.5% terraced, 17.7% semi-detached
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New to EPCs? Here's what to expect, how to get ready and what it costs, in plain English. Read the quick guide →

Wales landlord rules: quick version

  • When you let: give contract-holders a valid EPC.
  • Minimum E: generally applies to private lets.

More detail on the Mountain Ash page. Always double-check on GOV.WALES.

Next door to CF45

CF46 · TreharrisCF48 · CyfarthfaCF47 · Merthyr TydfilCF37 · PontypriddCF43 · FerndaleCF39 · Porth

← Energy Performance Certificate (EPC) across Mountain Ash · all areas

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 privately renting (Mountain Ash built-up area)
20.8% 5
  1. ONS Postcode Directory
  2. Doogal
  3. Doogal / ONSPD
  4. postcodes.io
  5. ONS Census 2021

Made with open data. See where it all comes from. Updated 26 October 2026.