4 William Street, Ystradgynlais, Swansea, SA9 1AT
About 4 William Street
4 William Street is a two-bedroom property in Ystradgynlais, Swansea, Swansea (SA9 1AT). It has council tax band B.
Held since July 2009 — that's 17 years off the open market, well above the local norm. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales.
Know exactly what you're buying at 4 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
Outside
- Private gardenYes
Energy performance
No EPC on record
This property doesn't have an Energy Performance Certificate yet. An EPC is required to sell or let — and unlocks our automated valuation.
Planning history
4 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 4 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
The latest sale fell during the post-2008 dip, often a low-water mark in price comparisons.
£65,000
Recorded with HM Land Registry.
Sales timeline
16 July 2009Most recent
£65,000
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 4 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

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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.