5 Allen Close, Old St Mellons, Cardiff, CF3 5DH
About 5 Allen Close
5 Allen Close is a four-bedroom detached house in Old St. Mellons, Cardiff, Cardiff (CF3 5DH). It has a recorded floor area of 159 m² (around 1707 sq ft), construction records dating it to 1996-2002 and council tax band F. The latest certificate (April 2011) shows a D (score 67), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 74). The latest certificate is from April 2011, so improvements made since then won't be reflected.
At 159 m² the property is well over the postcode median (90 m² across 24 EPCs), placing it in the larger end of the local stock. Across 1996–2011, sale prices on this property compounded at 5% per year. Today's modelled estimate of £468,000 sits 67.8% above the 2011 sale of £278,950. On a £-per-square-foot basis, the last sale (£163/sq ft) was about 16.6% above the typical sold price in the postcode. 15 years since the last transfer (October 2011).
What this property has
Inside
- Bedrooms4
Energy performance
5 Allen Close's EPC is over a decade old — improvements since won't be reflected.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 14 Apr 2021
EPC Rating
Certificate validity
Expired on 14 April 2021
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Planning history
5 Allen Close has no planning applications on record.
A planning report still maps activity across the surrounding area and reads this property's extension & conversion potential.
Sales history & valuation
Sale price has at least doubled since 1996.
£468,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.0% per year over 15 years.
£278,950
Growth on file: 5.0% per year over 15 years.
Sales timeline
20 October 2011Most recent
£278,950
+106.6%over 15 years13 October 1996
£135,000
Median price across the last 5 sales in CF3 5DH: £258,000 (2025–2020).
Nearby sales in CF3 5DH
31 Allen Close, Old St Mellons, Cardiff, CF3 5DH
Sold Jun 2025
£418,5003 Allen Close, Old St Mellons, Cardiff, CF3 5DH
Sold Aug 2024
£480,00020 Allen Close, Old St Mellons, Cardiff, CF3 5DH
Sold Apr 2024
£195,00038 Allen Close, Old St Mellons, Cardiff, CF3 5DH
Sold Apr 2022
£258,00037 Allen Close, Old St Mellons, Cardiff, CF3 5DH
Sold Dec 2020
£248,000
Versus other Allen Close homes
Floor Area for 5 Allen Close runs comfortably ahead of the street norm.
Price per m²
£1,759
Street avg £2,343
Floor Area
159 m²
Street avg 97 m²
Habitable Rooms
8 rooms
Street avg 6 rooms
CO₂ Emissions
5.0 t/year
Street avg 3.6 t/year
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The neighbourhood at a glance
Crime
242/mo
Falling year-on-year across the wider district.
Nearest stop
0.2 km
Llaneirwg Way — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







