23 Allen Close, Old St Mellons, Cardiff, CF3 5DH
About 23 Allen Close
23 Allen Close is a four-bedroom detached house in Old St. Mellons, Cardiff, Cardiff (CF3 5DH). It has a recorded floor area of 117 m² (around 1257 sq ft), construction records dating it to 1996-2002 and council tax band F. The latest certificate (January 2012) shows a D (score 66), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 71). The latest certificate is from January 2012, so improvements made since then won't be reflected.
Across 1997–2012, sale prices on this property compounded at 6.1% per year. Today's modelled estimate of £449,000 sits 59.5% above the 2012 sale of £281,500. On a £-per-square-foot basis, the last sale (£224/sq ft) was about 59.7% above the typical sold price in the postcode. 2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension and a conservatory, meaningful when judging how the property has evolved. At 117 m² it's 29.8% larger than the typical home in the postcode (90 m² median across 24 EPCs). 14 years since the last transfer (April 2012).
What this property has
Inside
- Bedrooms4
Energy performance
23 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This certificate is over 10 years old and is no longer valid.Expired 23 Jan 2022
EPC Rating
Get a survey for this property
Level 2 HomeBuyer Report
We've checked 10 risk factors against the available data for this property and believe a Level 2 HomeBuyer Report could be a suitable option for you.
From £695 · Includes VAT
Planning history
23 Allen Close has an approved single-storey extension on the planning record.
2 applications on record at 23 Allen Close, Old St Mellons, Cardiff, CF3 5DH
- Mar 2015ExtensionFullOutcome in report
Extension: Single storey
EXTENSION TO FIRST FLOOR ABOVE GARAGE TO FORM ADDITIONAL FLOOR AREA TO BEDROOM.
- Documents
- 6 docs on file
- Reference
- 15/00396/DCH
- More recent applications — locked
- ConservatoryMay 2023Decision
Unlock 23 Allen Close, Old St Mellons, Cardiff, CF3 5DH's full planning history
You're seeing the shape of it. The report has the substance.
- Every decision — granted, refused or withdrawn (2 on record)
- All 2 applications on this property in full
- The 13 documents, officer reports & conditions
- What the pattern means for extending or converting here
One time fee only - money back guarantee
Sales history & valuation
Sale price has at least doubled since 1997.
£449,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.1% per year over 14 years.
£281,500
Growth on file: 6.1% per year over 14 years.
Sales timeline
4 April 2012Most recent
£281,500
+134.6%over 14 years28 November 1997
£120,000
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
23 Allen Close outperforms the street on habitable rooms by a wide margin.
Price per m²
£2,410
Street avg £2,316
Floor Area
117 m²
Street avg 99 m²
Habitable Rooms
8 rooms
Street avg 6 rooms
CO₂ Emissions
5.0 t/year
Street avg 3.6 t/year
Similar properties nearby
1 Courtenay Close, Old St Mellons
CF3 5UL
1 Clos Hendre Gadno, Old St Mellons
CF3 5UJ
1 Chapel Row Lane, Old St Mellons
CF3 5ST
1 Brendon Close, Llanrumney
CF3 5RJ
1 Axbridge Crescent, Llanrumney
CF3 5TJ
1 Banwell Place, Llanrumney
CF3 5SH
1 Bronte Close, Llanrumney
CF3 5PN
1 Bluebell Drive
CF3 5RA
The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
3/mo
Rising 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.







