20a, Chestnut Avenue, Gorseinon, Swansea, SA4 4YP
About 20a
20a is a semi-detached house in Gorseinon, Swansea, Swansea (SA4 4YP). It has a recorded floor area of 61 m² (around 657 sq ft), construction records dating it to 1950-1966 and council tax band A. The latest certificate (November 2021) shows a C (score 70). When first surveyed in September 2009 the rating was E, the property has climbed 2 bands since. Between certificates, hot-water efficiency went from Very Poor to Good, lighting went from Very Poor to Average and main heating went from Very Poor to Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Good to Average.
Energy performance
EPC Rating
Certificate validity
Valid until 25 November 2031
Property Improvements
Changes detected from historical EPC data
Changed to a more efficient fuel source
Heating controls upgraded for better temperature management
Hot water system upgraded
More low energy lighting installed
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Level 2 HomeBuyer Report
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Planning history
20a has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
20a has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£116,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Median price across the last 5 sales in SA4 4YP: £104,430 (2026–2007).
Nearby sales in SA4 4YP
30 Chestnut Avenue, Gorseinon, Swansea, SA4 4YP
Sold Jan 2026
£155,00010 Chestnut Avenue, Gorseinon, Swansea, SA4 4YP
Sold Jul 2025
£190,00026 Chestnut Avenue, Gorseinon, Swansea, SA4 4YP
Sold May 2007
£104,43012 Chestnut Avenue, Gorseinon, Swansea, SA4 4YP
Sold Dec 2006
£63,00028 Chestnut Avenue, Gorseinon, Swansea, SA4 4YP
Sold Nov 2000
£34,995
Versus other Chestnut Avenue homes
On floor area, 20a runs well behind the street norm.
EPC Rating
70 (C)
Street avg 69 (D)
Floor Area
61 m²
Street avg 63 m²
CO₂ Emissions
2.2 t/year
Street avg 2.7 t/year
Habitable Rooms
3 rooms
Street avg 3 rooms
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The neighbourhood at a glance
Crime
160/mo
Falling year-on-year across the wider district.
Nearest stop
0.1 km
Chestnut Avenue — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







