37 Allen Close, Old St Mellons, Cardiff, CF3 5DH
About 37 Allen Close
37 Allen Close is a three-bedroom semi-detached house in Old St. Mellons, Cardiff, Cardiff (CF3 5DH). It has a recorded floor area of 71 m² (around 764 sq ft), construction records dating it to 1996-2002 and council tax band D. Other recorded features include a conservatory and outbuildings. The latest certificate (September 2020) shows a C (score 71). The recommended improvements would push it to B (score 86).
Last sale on file: £248,000 in December 2020. Across the public record there are 6 sales, relatively high churn for a single property. 2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Across 1997–2020, sale prices on this property compounded at 5.6% per year. Today's modelled estimate of £287,000 is 15.7% above the 2020 sale price. On a £-per-square-foot basis, the last sale (£325/sq ft) was about 136.6% above the typical sold price in the postcode. At 71 m² it's 27.9% smaller than the typical home in the postcode (99 m² median across 24 EPCs).
What this property has
Inside
- Bedrooms3
- Bathrooms2
- EnsuiteYes
- StudyYes
- ConservatoryYes
Outside
- Private gardenFront and rear
- GarageYes
- OutbuildingsYes
Energy performance
EPC Rating
Get a survey for this property
Level 3 Building Survey
Because the property has permanent outbuildings, we believe a Level 3 building survey should be considered.
From £885 · Includes VAT
Planning history
37 Allen Close has an approved single-storey rear extension on the planning record.
2 applications on record at 37 Allen Close, Old St Mellons, Cardiff, CF3 5DH
- Aug 2016OutbuildingFullOutcome in report
TO ERECT A SUMMERHOUSE/OFFICE IN THE REAR GARDEN OF THE PROPERTY.
- Documents
- 16 docs on file
- Reference
- 16/01019/DCH
- More recent applications — locked
- ExtensionAug 2020Decision
Unlock 37 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- Every decision — granted, refused or withdrawn (2 on record)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 24 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
37 Allen Close has more than tripled in price since its earliest registered sale in 1997.
£287,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.6% per year over 24 years.
£248,000
Growth on file: 5.6% per year over 24 years.
Sales timeline
21 December 2020Most recent
£248,000
+45.9%over 13 years22 July 2007
£169,950
-5.6%7 June 2007
£180,000
+21.6%over 3 years27 May 2004
£148,000
+59.2%over 1 year27 June 2002
£92,950
+36.7%over 5 years28 February 1997
£68,000
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
£258,00042 Allen Close, Old St Mellons, Cardiff, CF3 5DH
Sold May 2020
£207,500
Versus other Allen Close homes
Price per m² for 37 Allen Close runs comfortably ahead of the street norm.
Price per m²
£3,493
Street avg £2,271
Floor Area
71 m²
Street avg 100 m²
Habitable Rooms
5 rooms
Street avg 6 rooms
CO₂ Emissions
2.4 t/year
Street avg 3.7 t/year
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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.







