Cardiff · CF3

EICR in CF3 (Rumney)? We'll point you the right way.

Covering Rumney, Trowbridge, Llanrumney, St Mellons, Castleton, Marshfield, including Machen and Rudry, Pontprennau and Old St Mellons, Tredegar Park and Marshfield. Find qualified electricians nearby.

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Request an EICR in CF3 (Rumney)

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CF3 (Rumney) in a nutshell

CF3 covers Rumney, Trowbridge, Llanrumney, St Mellons, Castleton, Marshfield, in Caerphilly and Cardiff and Newport. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for CF3

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Two councils in one district

CF3 is split between Caerphilly and Cardiff and Newport. Some councils run their own landlord licensing, so check which one your home is in.

Where's this from?postcodes.io (ONSPD) local authority
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Give your full postcode

CF3 stretches across Llanrumney, Machen and Rudry, Pontprennau and Old St Mellons and more, so give your full postcode, not just 'CF3', when you ask for quotes.

Where's this from?postcodes.io (ONSPD) wards
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Postcodes change here

Lots of old CF3 postcodes have been retired. If an old letter shows a different postcode, use your current one.

Where's this from?Doogal/ONSPD: 922 of 1,973 postcodes active
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New to EICRs? 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

  • Every 5 years: an electrical safety test.
  • Copy: give the contract-holder the report.
  • Register: with Rent Smart Wales.

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

Next door to CF3

CF23 · LlanishenCF24 · Cardiff city centreCF14 · WhitchurchCF10 · Cardiff city centre

← Electrical safety (EICR) across Cardiff · all areas

Frequently asked questions

Which areas does CF3 cover?

CF3 (Rumney, Trowbridge, Llanrumney, St Mellons, Castleton, Marshfield) includes the wards of Llanrumney, Machen and Rudry, Pontprennau and Old St Mellons, Rumney, Tredegar Park and Marshfield, Trowbridge (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to CF3?

Neighbouring districts include CF23 (Llanishen), CF24 (Cardiff city centre), CF14 (Whitchurch) (ONS Postcode Directory via Doogal). A pro covering CF3 may well cover these too, so it's worth asking.

How many homes are in CF3?

About 17,240 households and 42,128 residents at the 2011 Census, across 922 active postcodes (Doogal / ONS Postcode Directory).

Which council area is CF3 in?

CF3 sits in Caerphilly, Cardiff, Newport (postcodes.io). Parliamentary constituency: Caerphilly, Cardiff East, Cardiff North, Newport West and Islwyn.

📊 The numbers behind this page
Postcode district
CF3 1
Areas covered
Rumney, Trowbridge, Llanrumney, St Mellons, Castleton, Marshfield 2
Active postcodes
922 3
Households (2011 Census, via Doogal)
17,240 2
Population (2011 Census, via Doogal)
42,128 2
Electoral wards
Llanrumney, Machen and Rudry, Pontprennau and Old St Mellons, Rumney, Tredegar Park and Marshfield, Trowbridge 4
Parliamentary constituencies
Caerphilly, Cardiff East, Cardiff North, Newport West and Islwyn 4
Local authority
Caerphilly, Cardiff, Newport 4
Households privately renting (Cardiff built-up area)
24.3% 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.