19 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
About 19 Alder Avenue
19 Alder Avenue is a three-bedroom semi-detached house in Ystradgynlais, Swansea, Swansea (SA9 1AQ). It has a recorded floor area of 112 m² (around 1206 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (June 2011) shows a C (score 69), just inside the C band. The latest certificate is from June 2011, so improvements made since then won't be reflected.
At 112 m² it's 16.5% larger than the typical home in the postcode (96 m² median across 14 EPCs). On energy efficiency it sits in the top 10% of properties in this postcode. Today's modelled estimate of £280,000 sits 51.4% above the 2011 sale of £185,000. On the market in September 2011 and unlisted since — roughly 15 years.
Know exactly what you're buying at 19 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
What this property has
Inside
- Bedrooms3
Outside
- GarageYes
Building
- Central heatingYes
Energy performance
19 Alder Avenue ranks among the most efficient homes in the postcode for energy use.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 22 Jun 2021
EPC Rating
Planning history
19 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 19 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
19 Alder Avenue valuation sits well clear of the typical sold price in this postcode.
£280,000
Modelled from EPC, postcode comparables.
£185,000
Recorded with HM Land Registry.
Sales timeline
8 September 2011Most recent
£185,000
Median price across the last 5 sales in SA9 1AQ: £248,000 (2025–2022).
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
£230,00010 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Sept 2023
£229,95013 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
Sold Aug 2022
£250,000
Everything we know about 19 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
19 Alder Avenue outperforms the street on epc rating by a wide margin.
Price per m²
£1,652
Street avg £1,938
Floor Area
112 m²
Street avg 100 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
4.0 t/year
Street avg 5.4 t/year
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1 2 Metz Cottages, Ystradgynlais
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1 Caehopkin Cottage, Caehopkin Road, Abercrave
SA9 1TX
1 Caemaen, Brecon Road, Penycae
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1 Coedlan, Lower Cwmtwrch
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1 Brooklands Terrace, Abercrave
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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.