22 William Street, Ystradgynlais, Swansea, SA9 1AT
About 22 William Street
22 William Street is a semi-detached house in Ystradgynlais, Swansea, Swansea (SA9 1AT). It has a recorded floor area of 82 m² (around 883 sq ft), construction records dating it to 1930-1949 and council tax band B. The latest certificate (February 2015) shows a D (score 55), a step below the typical UK home. The recommended improvements would lift it to B (score 86), a 2-band jump. The latest certificate is from February 2015, so improvements made since then won't be reflected.
Across 2008–2015, sale prices on this property compounded at -0.9% per year. Today's modelled estimate of £159,000 sits 89.3% above the 2015 sale of £84,000. Last changed hands 11 years ago, in September 2015.
Know exactly what you're buying at 22 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
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 10 Feb 2025
EPC Rating
Planning history
22 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 22 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
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Sales history & valuation
22 William Street valuation sits well clear of the typical sold price in this postcode.
£159,000
Modelled from EPC, postcode comparables and a sale-price growth of -0.9% per year over 8 years.
£84,000
Growth on file: -0.9% per year over 8 years.
Sales timeline
17 September 2015Most recent
£84,000
-6.7%over 7 years11 January 2008
£90,000
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 22 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
Price per m²
£1,024
Street avg £1,105
Floor Area
82 m²
Street avg 88 m²
Habitable Rooms
5 rooms
Street avg 4 rooms
CO₂ Emissions
5.3 t/year
Street avg 4.9 t/year
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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.