40 Clos Derwen, Cardiff, CF23 5HJ
About 40 Clos Derwen
40 Clos Derwen is a three-bedroom semi-detached house in Cardiff (CF23 5HJ). It has a recorded floor area of 80 m² (around 861 sq ft), construction records dating it to 1996-2002 and council tax band F. The latest certificate (July 2020) shows a C (score 71). The rating has held steady at C across 2 certificates since May 2010. Between certificates, lighting went from Poor to Very Good. The recommended improvements would push it to B (score 86).
At 80 m² it sits well below the postcode median (115 m² across 22 EPCs), making it one of the more compact homes locally. Today's modelled estimate of £400,000 is 21.2% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£383/sq ft) was about 68.9% above the typical sold price in the postcode. Sold May 2021 for £330,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
What this property has
Inside
- Bedrooms3
Outside
- Private gardenRear
- ParkingOff road
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
More low energy lighting installed
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Planning history
40 Clos Derwen has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£400,000
Modelled from EPC, postcode comparables.
£330,000
Recorded with HM Land Registry.
Sales timeline
3 May 2021Most recent
£330,000
Median price across the last 5 sales in CF23 5HJ: £425,000 (2025–2021).
Versus other Clos Derwen homes
On price per m², 40 Clos Derwen stands well clear of the street.
Price per m²
£4,125
Street avg £3,207
Floor Area
80 m²
Street avg 116 m²
Habitable Rooms
5 rooms
Street avg 6 rooms
CO₂ Emissions
2.7 t/year
Street avg 3.6 t/year
Similar properties nearby
The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
9/mo
Rising year-on-year across the wider district.
Nearest stop
0.2 km
Brandreth Rd — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







