CF23, Cardiff: Pentwyn, Penylan and Llanedeyrn

This page brings together the official data on CF23, a postcode district in Cardiff, so you can see what homes cost and what the area is like in one place.

CF23 takes in Pentwyn, Penylan, Llanedeyrn and Roath, with around 17,300 homes in all. Of the homes that sold, terraced houses were the most common, at just over three in ten. Semi-detached houses come next, at just over a quarter.

In the five years to August 2026, homes in CF23 sold for about £288,000 on average, up 24% on the five years before. That compares with about £262,000 across Cardiff over the same five years. Most of the district sits outside mapped flood risk areas.

All figures come from official sources, listed at the bottom of this page.

Of the homes sold in the five years to August 2026, 32% were terraced houses, 27% were semi-detached houses, 21% were flats and 21% were detached houses. 24% were leasehold and 1% were new builds (33 sales).

The latest EPC rating of each of the 17,266 homes on record, from the EPC register. Most are rated C and D, and 22% have no EPC on record.

• Aunder 1% (63)
• B5% (791)
• C34% (5,927)
• D30% (5,205)
• E7% (1,268)
• F1% (164)
• Gunder 1% (24)
• None22% (3,824)

19 state schools have a CF23 postcode, and 36 more are within a mile of one of its postcodes. Being near a school is not the same as being in its catchment: check admissions with the council.

Estyn, the inspectorate for schools in Wales, stopped giving schools an overall grade from spring 2022, so there is no single rating to show. Each school's inspection reports are on estyn.gov.wales.

We checked the centre of each of CF23's 910 postcodes against the flood risk maps from Natural Resources Wales. 820 sit outside every mapped area, and 90 are in one: 3 at high risk, 25 at medium risk and 62 at low risk. The centre of a postcode is not each home in it, so check an exact address on NRW's flood risk map.

• High risk from rivers or the sea: Greater than a 1 in 30 (3.3%) chance of flooding each year.
• Medium risk from rivers: Between a 1 in 100 (1%) and a 1 in 30 (3.3%) chance of flooding each year.
• Medium risk from the sea: Between a 1 in 200 (0.5%) and a 1 in 30 (3.3%) chance of flooding each year.
• Low risk from rivers or surface water and small watercourses: Between a 1 in 1,000 (0.1%) and a 1 in 100 (1%) chance of flooding each year.
• Low risk from the sea: Between a 1 in 1,000 (0.1%) and a 1 in 200 (0.5%) chance of flooding each year.

The sentence above counts each postcode once, at its highest risk. The table counts it under each source, so a postcode at risk from more than one source appears more than once.

NRW's map takes into account the effect of flood defences where it has information on them. Defences reduce the chance of flooding but do not completely stop it, as they can be overtopped or fail.

43 postcode centres are in areas NRW is reviewing, so the risk there may change.

Contains Natural Resources Wales information © Natural Resources Wales and database right. All rights reserved. Some features of this information are based on digital spatial data licensed from the UK Centre for Ecology & Hydrology © UKCEH. Defra, Met Office and DARD Rivers Agency © Crown copyright. © Cranfield University. © James Hutton Institute. Contains OS data © Crown copyright and database right.

CF23 has 806 postcodes with homes, in 5 sectors. Search above by postcode or street, or open a sector below and choose a postcode to check a home there. Each postcode is shown with its main street.