2 William Street, Ystradgynlais, Swansea, SA9 1AT
About 2 William Street
2 William Street is a semi-detached house in Ystradgynlais, Swansea, Swansea (SA9 1AT). It has a recorded floor area of 100 m² (around 1076 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (May 2025) shows a D (score 58), a step below the typical UK home. The recommended improvements would lift it to B (score 83), a 2-band jump.
Most recent transfer was July 2025 at £209,950 — fresh data. At 100 m² it's 22% larger than the typical home in the postcode (82 m² median across 13 EPCs). Today's modelled estimate of £236,000 is 12.4% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£195/sq ft) was about 116.3% above the typical sold price in the postcode. One historical planning record sits against the property in 2016.
Know exactly what you're buying at 2 William Street
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
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Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Rating
Planning history
- Jun 2016ExtensionFullIn report
Extension: Single storey
Construction of first floor single stoey extension
- Agent
- Mr P Tambling
- Documents
- 15 docs on file
- Reference
- P/2016/0477
We flagged 1 thing worth checking at 2 William Street
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
- Larger development activity nearby
30-day money-back guarantee
Sales history & valuation
2 William Street valuation sits well clear of the typical sold price in this postcode.
£236,000
Modelled from EPC, postcode comparables.
£209,950
Recorded with HM Land Registry.
Sales timeline
17 July 2025Most recent
£209,950
Median price across the last 5 sales in SA9 1AT: £125,000 (2023–2019).
Nearby sales in SA9 1AT
20 William Street, Ystradgynlais, Swansea, SA9 1AT
Sold Dec 2023
£125,00015 William Street, Ystradgynlais, Swansea, SA9 1AT
Sold Mar 2021
£127,000Ty Gardd, William Street, Ystradgynlais, Swansea, SA9 1AT
Sold Nov 2019
£235,0003 William Street, Ystradgynlais, Swansea, SA9 1AT
Sold Apr 2019
£85,00022 William Street, Ystradgynlais, Swansea, SA9 1AT
Sold Sept 2015
£84,000
Everything we know about 2 William Street, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Larger development activity nearby

Versus other William Street homes
On price per m², 2 William Street stands well clear of the street.
Price per m²
£2,100
Street avg £1,015
Floor Area
100 m²
Street avg 86 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
5.4 t/year
Street avg 4.8 t/year
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1 Caerbont Cottages, Abercrave
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1 Brynygroes Cottages, Ystradgynlais
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1 Brynawel Villas, Brecon Road, Ystradgynlais
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The neighbourhood at a glance
Crime
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Glanrhyd Hospital — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.