10 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
About 10 Alder Avenue
10 Alder Avenue is a semi-detached house in Ystradgynlais, Swansea, Swansea (SA9 1AQ). It has a recorded floor area of 108 m² (around 1163 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (May 2023) shows an E (score 54), well below the UK norm with real room to improve. The recommended improvements would lift it to B (score 84), a 3-band jump.
It lags the bulk of the postcode on energy efficiency (less efficient than 71% of similar EPCs). Today's modelled estimate of £268,000 is 16.5% above the 2023 sale price. On a £-per-square-foot basis, the last sale (£198/sq ft) was about 31.8% above the typical sold price in the postcode. Sold September 2023 for £229,950.
Know exactly what you're buying at 10 Alder Avenue
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
10 Alder Avenue's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Planning history
10 Alder Avenue has no planning applications on record.
Notable planning nearby
2applications of note in the surrounding area
We flagged 1 thing worth checking at 10 Alder Avenue
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
10 Alder Avenue valuation sits well clear of the typical sold price in this postcode.
£268,000
Modelled from EPC, postcode comparables.
£229,950
Recorded with HM Land Registry.
Sales timeline
28 September 2023Most recent
£229,950
Median price across the last 5 sales in SA9 1AQ: £248,000 (2025–2021).
Nearby sales in SA9 1AQ
22 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Mar 2025
£248,00021 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Feb 2025
£278,00020 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Jan 2024
£230,00013 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Aug 2022
£250,00018 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Apr 2021
£160,000
Everything we know about 10 Alder Avenue, 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 Alder Avenue homes
10 Alder Avenue is notably below the street on co₂ emissions.
Price per m²
£2,129
Street avg £1,904
Floor Area
108 m²
Street avg 101 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
6.8 t/year
Street avg 5.2 t/year
Similar properties nearby
1 Caedegar Road, Ystradgynlais
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1 Brynawel Villas, Brecon Road, Ystradgynlais
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1 Brynygroes Cottages, Ystradgynlais
SA9 1LE
1 Abercrave Villas, Heol Tawe, Abercrave
SA9 1TN
1 2 Metz Cottages, Ystradgynlais
SA9 1SB
1 Astoria Place, Ystradgynlais
SA9 1HW
1 Caerbont Cottages, Abercrave
SA9 1SP
1 Caemaen, Brecon Road, Penycae
SA9 1YN
The neighbourhood at a glance
Crime
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Post Office — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.