4 Derwen Road, Ystradgynlais, Swansea, SA9 1HL
About 4 Derwen Road
4 Derwen Road is a three-bedroom detached house in Ystradgynlais, Swansea, Swansea (SA9 1HL). It has a recorded floor area of 145 m² (around 1561 sq ft), construction records dating it to 1950-1966 and council tax band E. The latest certificate (November 2020) shows a D (score 65), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 79). Period features are noted in the property record. The home occupies a cul-de-sac position.
At 145 m² it's 28.3% larger than the typical home in the postcode (113 m² median across 5 EPCs). Across 2018–2021, sale prices on this property compounded at 13.7% per year. Today's modelled estimate of £348,000 is 34.9% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£165/sq ft) was about 100.4% above the typical sold price in the postcode. Last sale on file: £258,000 in April 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 4 Derwen Road
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
- Bedrooms3
- Bathrooms1
- Dining roomYes
- StudyYes
Outside
- Private gardenrear
- Parkingoff_road
- Cul-de-sacYes
Building
- Period featuresYes
- RefurbishedYes
Energy performance
4 Derwen Road's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Planning history
4 Derwen Road has no planning applications on record.
Notable planning nearby
2applications of note in the surrounding area
We flagged 1 thing worth checking at 4 Derwen Road
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 landed in the post-pandemic price surge — useful context when reading the figure.
£348,000
Modelled from EPC, postcode comparables and a sale-price growth of 13.7% per year over 3 years.
£258,000
Growth on file: 13.7% per year over 3 years.
Sales timeline
6 April 2021Most recent
£258,000
+39.5%over 2 years6 September 2018
£185,000
Median price across the last 5 sales in SA9 1HL: £122,250 (2025–2003).
Nearby sales in SA9 1HL
12 Derwen Road, Ystradgynlais, Swansea, SA9 1HL
Sold Aug 2025
£260,0006 Derwen Road, Ystradgynlais, Swansea, SA9 1HL
Sold Jan 2017
£165,0003 Derwen Road, Ystradgynlais, Swansea, SA9 1HL
Sold Mar 2015
£122,25010 Derwen Road, Ystradgynlais, Swansea, SA9 1HL
Sold Sept 2003
£115,0005 Derwen Road, Ystradgynlais, Swansea, SA9 1HL
Sold Oct 2001
£59,500
Everything we know about 4 Derwen Road, 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 Derwen Road homes
On floor area, 4 Derwen Road stands well clear of the street.
Price per m²
£1,779
Street avg £1,406
Floor Area
145 m²
Street avg 111 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
6.5 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
Teddy Bear Bridge — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.