12 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY
About 12 Gwern Hafren
12 Gwern Hafren is a two-bedroom semi-detached house in Cardiff (CF11 9EY). It has a recorded floor area of 77 m² (around 829 sq ft), construction records dating it to 2007 onwards and council tax band F. The latest certificate (March 2019) returns a B (score 81), comfortably above the UK average. The rating has held steady at B across 2 certificates since February 2009. Between certificates, lighting went from Good to Very Good; while wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Good. At 77 m² this is the 12th smallest of 15 units on EPC record in the building, where floor areas span 34–93 m². The building's EPC ratings span C to B, with this unit at the top.
At 77 m² the property is well over the postcode median (49 m² across 14 EPCs), placing it in the larger end of the local stock. Across 2009–2020, sale prices on this property compounded at 3.4% per year. Sold November 2020 for £255,000.
What this property has
Inside
- Bedrooms2
- Bathrooms2
Outside
- ParkingAllocated
Energy performance
12 Gwern Hafren's carbon output is low for the local stock.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency decreased
More low energy lighting installed
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Planning history
12 Gwern Hafren has no planning applications on record.
But the area is active
4 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.
£271,000
Modelled from EPC, postcode comparables and a sale-price growth of 3.4% per year over 11 years.
£255,000
Growth on file: 3.4% per year over 11 years.
Sales timeline
26 November 2020Most recent
£255,000
+45.7%over 11 years2 July 2009
£174,995
Median price across the last 5 sales in CF11 9EY: £345,000 (2024–2020).
Nearby sales in CF11 9EY
2 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY
Sold Apr 2024
£195,10014 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY
Sold Feb 2024
£416,00015 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY
Sold Mar 2022
£405,0004 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY
Sold Feb 2022
£154,0005 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY
Sold Aug 2019
£183,000
Versus other Severn Grove homes
On floor area, 12 Gwern Hafren stands well clear of the street.
Price per m²
£3,312
Street avg £3,405
Floor Area
77 m²
Street avg 50 m²
Habitable Rooms
3 rooms
Street avg 2 rooms
CO₂ Emissions
1.4 t/year
Street avg 1.0 t/year
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The neighbourhood at a glance
Crime
9/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Halfway Hotel — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







