Cardiff · CF23

Gas safety certificate in CF23 (Llanishen)? We'll point you the right way.

Covering Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons, including Heath, Lisvane and Thornhill, Plasnewydd. Find Gas Safe registered engineers nearby.

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Request a gas safety certificate in CF23 (Llanishen)

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Request a gas safety certificate in CF23 (Llanishen)

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CF23 (Llanishen) in a nutshell

CF23 covers Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons, in Cardiff. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for CF23

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Cardiff council area

CF23 is in Cardiff'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

CF23 stretches across Cyncoed, Heath, Lisvane and Thornhill and more, so give your full postcode, not just 'CF23', when you ask for quotes.

Where's this from?postcodes.io (ONSPD) wards
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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: 79.2% mains gas only
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New to gas safety certificates? 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 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 Cardiff page. Always double-check on GOV.WALES.

Next door to CF23

CF3 · RumneyCF24 · Cardiff city centreCF14 · WhitchurchCF10 · Cardiff city centre

← Gas safety (CP12) across Cardiff · all areas

Frequently asked questions

Which areas does CF23 cover?

CF23 (Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons) includes the wards of Cyncoed, Heath, Lisvane and Thornhill, Pentwyn, Penylan, Plasnewydd, Pontprennau and Old St Mellons, Trowbridge (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to CF23?

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

How many homes are in CF23?

About 18,525 households and 46,988 residents at the 2011 Census, across 908 active postcodes (Doogal / ONS Postcode Directory).

Which council area is CF23 in?

CF23 sits in Cardiff (postcodes.io). Parliamentary constituency: Cardiff East, Cardiff North.

📊 The numbers behind this page
Postcode district
CF23 1
Areas covered
Llanishen, Cyncoed, Pentwyn, Penylan, Pontprennau, Old St Mellons 2
Active postcodes
908 3
Households (2011 Census, via Doogal)
18,525 2
Population (2011 Census, via Doogal)
46,988 2
Electoral wards
Cyncoed, Heath, Lisvane and Thornhill, Pentwyn, Penylan, Plasnewydd, Pontprennau and Old St Mellons, Trowbridge 4
Parliamentary constituencies
Cardiff East, Cardiff North 4
Local authority
Cardiff 4
Households heated by mains gas only (Cardiff built-up area)
79.2% 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.