31 Heol Y Gelli, Penllergaer, Swansea, SA4 9BW
About 31 Heol Y Gelli
31 Heol Y Gelli is a three-bedroom semi-detached house in Penllergaer, Swansea, Swansea (SA4 9BW). It has a recorded floor area of 82 m² (around 883 sq ft), construction records dating it to 1967-1975 and council tax band B. The latest certificate (February 2019) shows a D (score 66), on the cusp of jumping into the C band. When first surveyed in February 2009 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Poor and roof efficiency went from Average to Very Good. The recommended improvements would lift it to B (score 85), a 2-band jump.
It changed hands recently, sold February 2025 for £141,000. Across 2008–2025, sale prices on this property compounded at 1.9% per year. Today's modelled estimate of £176,000 is 24.8% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£160/sq ft) was about 66.1% above the typical sold price in the postcode.
What this property has
Inside
- Bedrooms3
- Bathrooms1
- Open-plan layoutYes
- Dining roomYes
Outside
- Private gardenFront and rear
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Wall insulation improved
Loft insulation upgraded to recommended levels
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Planning history
31 Heol Y Gelli 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
31 Heol Y Gelli valuation sits well clear of the typical sold price in this postcode.
£176,000
Modelled from EPC, postcode comparables and a sale-price growth of 1.9% per year over 17 years.
£141,000
Growth on file: 1.9% per year over 17 years.
Sales timeline
19 February 2025Most recent
£141,000
+36.9%over 16 years29 May 2008
£103,000
Median price across the last 5 sales in SA4 9BW: £107,000 (2024–2018).
Nearby sales in SA4 9BW
35 Heol Y Gelli, Penllergaer, Swansea, SA4 9BW
Sold Nov 2024
£175,00049 Heol Y Gelli, Penllergaer, Swansea, SA4 9BW
Sold Nov 2020
£115,0009 Heol Y Gelli, Penllergaer, Swansea, SA4 9BW
Sold Jun 2020
£107,00018 Heol Y Gelli, Penllergaer, Swansea, SA4 9BW
Sold Mar 2019
£90,00029 Heol Y Gelli, Penllergaer, Swansea, SA4 9BW
Sold Jun 2018
£70,000
Versus other Heol Y Gelli homes
Years Held for 31 Heol Y Gelli lags the street by a wide margin.
Price per m²
£1,720
Street avg £1,145
Floor Area
82 m²
Street avg 88 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
3.3 t/year
Street avg 4.4 t/year
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The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Llwyn-yr-Eos — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







