6 Crystal Avenue, Cardiff, CF23 5QJ
About 6 Crystal Avenue
6 Crystal Avenue is a three-bedroom detached house in Cardiff (CF23 5QJ). It has a recorded floor area of 71 m² (around 764 sq ft), construction records dating it to 1930-1949 and council tax band F. The latest certificate (February 2026) shows a D (score 63), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since June 2010. Between certificates, wall efficiency dropped from Good to Poor and window efficiency dropped from Average to Poor. The recommended improvements would push it to C (score 76). This certificate was lodged in the last six months, so the rating reflects current condition.
Across 1998–2015, sale prices on this property compounded at 7.8% per year. Today's modelled estimate of £378,000 is 45.7% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£340/sq ft) was about 37% above the typical sold price in the postcode. Last sold in July 2015, so it's been off the market for around 11 years. At 71 m² it's 27.6% smaller than the typical home in the postcode (98 m² median across 11 EPCs).
What this property has
Inside
- Bedrooms3
- Bathrooms1
Outside
- Private gardenRear
- DrivewayYes
Everything you need to know about 6 Crystal Avenue
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The data behind every report
Energy performance
The EPC has just been inspected, so the rating reflects current condition.
EPC Rating
Certificate validity
Valid until 26 February 2036
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
More low energy lighting installed
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Planning history
6 Crystal Avenue 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
6 Crystal Avenue has more than tripled in price since its earliest registered sale in 1998.
£378,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.8% per year over 17 years.
£259,500
Growth on file: 7.8% per year over 17 years.
Sales timeline
16 July 2015Most recent
£259,500
+52.6%over 3 years8 November 2011
£170,000
+131.3%over 13 years8 October 1998
£73,500
Median price across the last 5 sales in CF23 5QJ: £345,000 (2024–2018).
Nearby sales in CF23 5QJ
Versus other Crystal Avenue homes
6 Crystal Avenue is notably below the street on habitable rooms.
Price per m²
£3,655
Street avg £2,939
Floor Area
71 m²
Street avg 104 m²
Habitable Rooms
3 rooms
Street avg 6 rooms
CO₂ Emissions
3.1 t/year
Street avg 4.6 t/year
Everything you need to know about 6 Crystal Avenue
The true value, the hidden risks and the full sale history, in one report.
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Similar properties nearby
The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
169/mo
Falling year-on-year across the wider district.
Nearest stop
0.1 km
Heath High Level Rail Station — railway station.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.