21 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
About 21 Clos Cilfwnwr
21 Clos Cilfwnwr is a detached house in Penllergaer, Swansea, Swansea (SA4 9BU). It has a recorded floor area of 81 m² (around 872 sq ft), construction records dating it to 1976-1982 and council tax band E. The latest certificate (July 2018) shows a D (score 66), on the cusp of jumping into the C band. The recommended improvements would lift it to B (score 84), a 2-band jump.
Across 2018–2022, sale prices on this property compounded at 12.8% per year. On a £-per-square-foot basis, the last sale (£361/sq ft) was about 71.7% above the typical sold price in the postcode. Sold July 2022 for £315,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend. One historical planning record sits against the property in 2022.
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Rating
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Planning history
1 application on record at 21 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
- Aug 2022ExtensionOutlineOutcome in report
Extension: Single storey · Rear of property
Single storey rear extension (application for a Certificate of Proposed Lawful Development)
- Documents
- 9 docs on file
- Reference
- 2022/1904/PLD
Unlock 21 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU's full planning history
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- Every decision — granted, refused or withdrawn (1 on record)
- All 1 application on this property in full, plus 1 notable nearby
- The 9 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£325,000
Modelled from EPC, postcode comparables and a sale-price growth of 12.8% per year over 4 years.
£315,000
Growth on file: 12.8% per year over 4 years.
Sales timeline
21 July 2022Most recent
£315,000
+57.5%over 3 years9 October 2018
£200,000
Median price across the last 5 sales in SA4 9BU: £325,000 (2025–2018).
Nearby sales in SA4 9BU
8 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
Sold Feb 2025
£335,00019 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
Sold Nov 2024
£335,0003 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
Sold Jun 2022
£325,00022 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
Sold Feb 2021
£305,0002 Clos Cilfwnwr, Penllergaer, Swansea, SA4 9BU
Sold Dec 2018
£240,000
Versus other Clos Cilfwnwr homes
21 Clos Cilfwnwr outperforms the street on price per m² by a wide margin.
Price per m²
£3,889
Street avg £2,760
Floor Area
81 m²
Street avg 97 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
3.2 t/year
Street avg 4.2 t/year
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The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Clos Cilfwnwr — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







