19 William Street, Ystradgynlais, Swansea, SA9 1AT
About 19 William Street
19 William Street is a two-bedroom end-of-terrace house in Ystradgynlais, Swansea, Swansea (SA9 1AT). It has a recorded floor area of 104 m² (around 1114 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (October 2008) shows a D (score 55), a step below the typical UK home. The latest certificate is from October 2008, so improvements made since then won't be reflected.
Today's modelled estimate of £160,000 sits 125.4% above the 2013 sale of £71,000. On a £-per-square-foot basis, the last sale (£64/sq ft) was about 30.6% below the postcode norm. At 104 m² it's 26.2% larger than the typical home in the postcode (82 m² median across 13 EPCs). Last changed hands 13 years ago, in November 2013.
Know exactly what you're buying at 19 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
Launch offer · save £5
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms2
Energy performance
19 William Street'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This certificate is over 10 years old and is no longer valid.Expired 07 Oct 2018
EPC Rating
Planning history
19 William Street has no planning applications on record.
Notable planning nearby
2applications of note in the surrounding area
We flagged 1 thing worth checking at 19 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
19 William Street valuation sits well clear of the typical sold price in this postcode.
£160,000
Modelled from EPC, postcode comparables.
£71,000
Recorded with HM Land Registry.
Sales timeline
29 November 2013Most recent
£71,000
Median price across the last 5 sales in SA9 1AT: £127,000 (2025–2019).
Nearby sales in SA9 1AT
2 William Street, Ystradgynlais, Swansea, SA9 1AT
Sold Jul 2025
£209,95020 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
£85,000
Everything we know about 19 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
Floor Area for 19 William Street runs comfortably ahead of the street norm.
Price per m²
£686
Street avg £1,133
Floor Area
104 m²
Street avg 86 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
5.1 t/year
Street avg 4.9 t/year
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1 Caehopkin Cottage, Caehopkin Road, Abercrave
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1 2 Metz Cottages, Ystradgynlais
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1 Abercrave Villas, Heol Tawe, Abercrave
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1 Brynygroes Cottages, Ystradgynlais
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1 Caerlan Cottages, Caerlan, Abercrave
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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.