12a, Heol Y Twyn, Pontlliw, Swansea, SA4 9EU
About 12a
12a is a four-bedroom detached house in Pontlliw, Swansea, Swansea (SA4 9EU). It has a recorded floor area of 122 m² (around 1313 sq ft), construction records dating it to 2003-2006 and council tax band E. The latest certificate (November 2011) shows a C (score 75), near the top of the C band. The latest certificate is from November 2011, so improvements made since then won't be reflected.
At 122 m² the property is well over the postcode median (68 m² across 28 EPCs), placing it in the larger end of the local stock. Its energy rating outperforms most of the postcode (better than 75% of similar EPCs). Across 2006–2013, sale prices on this property compounded at -1.3% per year. Today's modelled estimate of £275,000 sits 71.9% above the 2013 sale of £160,000. On the market in June 2013 and unlisted since — roughly 13 years.
What this property has
Inside
- Bedrooms4
- Dining roomYes
- EnsuiteYes
Outside
- GarageYes
Building
- RefurbishedYes
Energy performance
12a'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This certificate is over 10 years old and is no longer valid.Expired 28 Nov 2021
EPC Rating
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Planning history
12a has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
12a valuation sits well clear of the typical sold price in this postcode.
£275,000
Modelled from EPC, postcode comparables and a sale-price growth of -1.3% per year over 6 years.
£160,000
Growth on file: -1.3% per year over 6 years.
Sales timeline
19 June 2013Most recent
£160,000
-8.3%over 6 years20 December 2006
£174,500
Median price across the last 5 sales in SA4 9EU: £142,500 (2025–2022).
Nearby sales in SA4 9EU
21 Heol Y Twyn, Pontlliw, Swansea, SA4 9EU
Sold Apr 2025
£128,00018 Heol Y Twyn, Pontlliw, Swansea, SA4 9EU
Sold Dec 2024
£165,00122 Heol Y Twyn, Pontlliw, Swansea, SA4 9EU
Sold Apr 2024
£164,00038 Heol Y Twyn, Pontlliw, Swansea, SA4 9EU
Sold Mar 2024
£136,0001 Heol Y Twyn, Pontlliw, Swansea, SA4 9EU
Sold Oct 2022
£142,500
Versus other Heol Y Twyn homes
EPC Rating for 12a runs comfortably ahead of the street norm.
Price per m²
£1,311
Street avg £1,743
Floor Area
122 m²
Street avg 69 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
2.8 t/year
Street avg 3.3 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
Post Office — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







