Treorchy · CF42

EPC in CF42 (Treorchy)? We'll point you the right way.

Covering Treorchy, Cwmparc, Ynyswen, Treherbert, Blaencwm, Blaenrhondda. Find accredited domestic energy assessors nearby.

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

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CF42 (Treorchy) in a nutshell

CF42 covers Treorchy, Cwmparc, Ynyswen, Treherbert, Blaencwm, Blaenrhondda, 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 CF42

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Rhondda Cynon Taf council area

CF42 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

CF42 stretches across Treherbert, Treorchy, so give your full postcode, not just 'CF42', 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, Treorchy: 78.0% terraced, 8.9% 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 Treorchy page. Always double-check on GOV.WALES.

Next door to CF42

CF41 · PentreCF43 · FerndaleCF40 · TonypandyCF44 · AberdareCF35 · PencoedCF39 · Porth

← Energy Performance Certificate (EPC) across Treorchy · all areas

Frequently asked questions

Which areas does CF42 cover?

CF42 (Treorchy, Cwmparc, Ynyswen, Treherbert, Blaencwm, Blaenrhondda) includes the wards of Treherbert, Treorchy (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to CF42?

Neighbouring districts include CF41 (Pentre), CF43 (Ferndale), CF40 (Tonypandy), CF44 (Aberdare), CF35 (Pencoed) (ONS Postcode Directory via Doogal). A pro covering CF42 may well cover these too, so it's worth asking.

How many homes are in CF42?

About 5,937 households and 13,423 residents at the 2011 Census, across 310 active postcodes (Doogal / ONS Postcode Directory).

Which council area is CF42 in?

CF42 sits in Rhondda Cynon Taf (postcodes.io). Parliamentary constituency: Rhondda and Ogmore.

📊 The numbers behind this page
Postcode district
CF42 1
Areas covered
Treorchy, Cwmparc, Ynyswen, Treherbert, Blaencwm, Blaenrhondda 2
Active postcodes
310 3
Households (2011 Census, via Doogal)
5,937 2
Population (2011 Census, via Doogal)
13,423 2
Electoral wards
Treherbert, Treorchy 4
Parliamentary constituencies
Rhondda and Ogmore 4
Local authority
Rhondda Cynon Taf 4
Households privately renting (Treorchy built-up area)
19.1% 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.