12 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
About 12 Alder Avenue
12 Alder Avenue is a three-bedroom semi-detached house in Ystradgynlais, Swansea, Swansea (SA9 1AQ). It has a recorded floor area of 93 m² (around 1003 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (June 2009) shows a G (score 19), near the bottom of the EPC scale. The recommended improvements would push it to F (score 25). Main heating runs on electricity. The latest certificate is from June 2009, so improvements made since then won't be reflected.
Held since November 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. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £227,000 sits 69.4% above the 2009 sale of £134,000.
Know exactly what you're buying at 12 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
- Dining roomYes
Outside
- Private gardenYes
- GarageYes
Energy performance
12 Alder Avenue sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 23 Jun 2019
EPC Rating
Planning history
12 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 12 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
The latest sale fell during the post-2008 dip, often a low-water mark in price comparisons.
£227,000
Modelled from EPC, postcode comparables.
£134,000
Recorded with HM Land Registry.
Sales timeline
27 November 2009Most recent
£134,000
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 12 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
Years Held for 12 Alder Avenue runs comfortably ahead of the street norm.
Price per m²
£1,437
Street avg £1,953
Floor Area
93 m²
Street avg 102 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
6.4 t/year
Street avg 5.2 t/year
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The neighbourhood at a glance
Crime
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 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.