Harlech House, Flat 4, Heol Isaf, Radyr, Cardiff, CF15 8AP
About Harlech House
Harlech House is a semi-detached house in Radyr, Cardiff, Cardiff (CF15 8AP). It has a recorded floor area of 73 m² (around 786 sq ft), construction records dating it to 1983-1990 and council tax band D. The latest certificate (February 2022) shows a C (score 77), near the top of the C band. When first surveyed in April 2015 the rating was D, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Average to Good and lighting went from Poor to Very Good. At 73 m² this is the 4th smallest of 12 units on EPC record in Harlech House, where floor areas span 70–75 m². The building's EPC ratings span D to B across 12 units on file.
Across 2016–2021, sale prices on this property compounded at 1.7% per year. Today's modelled estimate of £183,000 is 28.9% above the 2021 sale price. Most recent transfer: December 2021 at £142,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Hot water efficiency improved
More low energy lighting installed
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Planning history
Harlech House has no planning applications on record.
But the area is active
3 notable applications 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.
£183,000
Modelled from EPC, postcode comparables and a sale-price growth of 1.7% per year over 6 years.
£142,000
Growth on file: 1.7% per year over 6 years.
Sales timeline
3 December 2021Most recent
£142,000
+10.3%over 5 years8 January 2016
£128,750
Median price across the last 5 sales in CF15 8AP: £150,000 (2024–2018).
Nearby sales in CF15 8AP
Harlech House, Flat 3, Heol Isaf, Radyr, Cardiff, CF15 8AP
Sold Mar 2024
£190,000Harlech House, Flat 9, Heol Isaf, Radyr, Cardiff, CF15 8AP
Sold Nov 2022
£162,000Harlech House, Flat 6, Heol Isaf, Radyr, Cardiff, CF15 8AP
Sold Jul 2022
£150,000Harlech House, Flat 1, Heol Isaf, Radyr, Cardiff, CF15 8AP
Sold Oct 2015
£130,000Harlech House, Flat 7, Heol Isaf, Radyr, Cardiff, CF15 8AP
Sold Nov 1998
£50,000
Versus other Heol Isaf homes
Price per m²
£1,945
Street avg £1,870
Floor Area
73 m²
Street avg 73 m²
Habitable Rooms
4 rooms
Street avg 4 rooms
CO₂ Emissions
1.9 t/year
Street avg 2.2 t/year
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.0 km
Danybryn — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







