21 Ynyswen, Penycae, Swansea, SA9 1YS
About 21 Ynyswen
21 Ynyswen is an end-of-terrace house in Penycae, Swansea, Swansea (SA9 1YS). It has a recorded floor area of 109 m² (around 1173 sq ft), construction records dating it to 1950-1966 and council tax band A. The latest certificate (May 2018) shows an F (score 37), near the bottom of the EPC scale. Earlier certificates rated it D (July 2015); the latest reading is 2 bands lower. Between certificates, wall efficiency dropped from Good to Poor and roof efficiency dropped from Good to Poor. The recommended improvements would lift it to A (score 92), a 5-band jump. Main heating runs on oil.
At 109 m² it's 23.9% larger than the typical home in the postcode (88 m² median across 30 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £169,000 sits 87.8% above the 2015 sale of £90,000. Last sold in November 2015, so it's been off the market for around 11 years.
Know exactly what you're buying at 21 Ynyswen
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
21 Ynyswen sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Rating
Planning history
21 Ynyswen has no planning applications on record.
Notable planning nearby
2applications of note in the surrounding area
We flagged 1 thing worth checking at 21 Ynyswen
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
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Sales history & valuation
21 Ynyswen valuation sits well clear of the typical sold price in this postcode.
£169,000
Modelled from EPC, postcode comparables.
£90,000
Recorded with HM Land Registry.
Sales timeline
17 November 2015Most recent
£90,000
Median price across the last 5 sales in SA9 1YS: £153,000 (2025–2024).
Nearby sales in SA9 1YS
Everything we know about 21 Ynyswen, 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 Ynyswen homes
21 Ynyswen is notably below the street on co₂ emissions.
Price per m²
£826
Street avg £1,128
Floor Area
109 m²
Street avg 90 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
8.8 t/year
Street avg 5.1 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
Ynyswen — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.