16 Alder Avenue, Ystradgynlais, Swansea, SA9 1AQ
About 16 Alder Avenue
16 Alder Avenue is a three-bedroom semi-detached house in Ystradgynlais, Swansea, Swansea (SA9 1AQ). It has a recorded floor area of 99 m² (around 1066 sq ft), construction records dating it to 1930-1949 and council tax band D. The latest certificate (July 2014) shows a D (score 55), a step below the typical UK home. The recommended improvements would lift it to B (score 84), a 2-band jump. The latest certificate is from July 2014, so improvements made since then won't be reflected.
Today's modelled estimate of £257,000 sits 83.6% above the 2015 sale of £140,000. 2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Last changed hands 11 years ago, in August 2015.
Know exactly what you're buying at 16 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
- Bathrooms1
- Dining roomYes
Outside
- GarageYes
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 01 Jul 2024
EPC Rating
Planning history
Council records include a two-storey extension at 16 Alder Avenue.
- Jul 2020ExtensionFullIn report
Extension: Two storey
Erection of a two storey extension
- Documents
- 16 docs on file
- Reference
- 20/0844/HH
- Sept 2019FullIn report
Demolition of garage and shed, and erection of replacement shed
- Agent
- Masters Architectural
- Documents
- 11 docs on file
- Reference
- 19/0851/HH
We flagged 1 thing worth checking at 16 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
16 Alder Avenue valuation sits well clear of the typical sold price in this postcode.
£257,000
Modelled from EPC, postcode comparables.
£140,000
Recorded with HM Land Registry.
Sales timeline
17 August 2015Most recent
£140,000
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 16 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
Price per m² for 16 Alder Avenue lags the street by a wide margin.
Price per m²
£1,414
Street avg £1,955
Floor Area
99 m²
Street avg 101 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
4.8 t/year
Street avg 5.3 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.