21 Cefn Helyg, Sketty, Swansea, SA2 9GY
About 21 Cefn Helyg
21 Cefn Helyg is a detached house in Sketty, Swansea, Swansea (SA2 9GY). It has a recorded floor area of 141 m² (around 1518 sq ft), construction records dating it to 1991-1995 and council tax band F. The latest certificate (April 2022) shows an E (score 51), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 74), a 2-band jump.
Untraded for 23 years, with the last transfer in July 2003. At 141 m² the property is well over the postcode median (107 m² across 10 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 1996–2003, sale prices on this property compounded at 7.4% per year. Today's modelled estimate of £398,000 sits 94.2% above the 2003 sale of £204,995. On a £-per-square-foot basis, the last sale (£135/sq ft) was about 27.7% below the postcode norm. One planning record on file: an extension approved in 2012. Past consents include an extension and a porch, meaningful when judging how the property has evolved.
Energy performance
21 Cefn Helyg sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Rating
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Planning history
21 Cefn Helyg has an approved extension on the planning record.
1 application on record at 21 Cefn Helyg, Sketty, Swansea, SA2 9GY
- Jan 2012PorchFullOutcome in report
Front porch
Extension- Documents
- 6 docs on file
- Reference
- 2011/1604
Unlock 21 Cefn Helyg, Sketty, Swansea, SA2 9GY'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- Every decision — granted, refused or withdrawn (1 on record)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 2 notable nearby
- The 6 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
21 Cefn Helyg's estimated value is more than triple its earliest registered sale price (1996).
£398,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.4% per year over 7 years.
£204,995
Growth on file: 7.4% per year over 7 years.
Sales timeline
30 July 2003Most recent
£204,995
+70.8%over 7 years2 February 1996
£120,000
Median price across the last 5 sales in SA2 9GY: £310,000 (2025–2018).
Nearby sales in SA2 9GY
Versus other Cefn Helyg homes
On price per m², 21 Cefn Helyg runs well behind the street norm.
Price per m²
£1,454
Street avg £2,637
Floor Area
141 m²
Street avg 99 m²
Habitable Rooms
9 rooms
Street avg 6 rooms
CO₂ Emissions
7.7 t/year
Street avg 3.9 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
6/mo
Rising year-on-year across the wider district.
Nearest stop
0.2 km
Llwyn Mawr Road — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







