4a, Costow, Swindon, SN4 9QN
About 4a
4a is a detached house in Costow, Swindon, Swindon (SN4 9QN). It has a recorded floor area of 207 m² (around 2228 sq ft) and construction records dating it to 2022. The latest certificate (January 2022) shows a C (score 71). When first surveyed in December 2014 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Poor to Very Good, roof efficiency went from Good to Very Good and window efficiency went from Average to Good. The recommended improvements would push it to B (score 88). Main heating runs on oil: heating oil.
At 207 m² the property is well over the postcode median (113 m² across 5 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £1,037,000 is 12.1% above the 2022 sale price. Most recent transfer: November 2022 at £925,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Energy performance
4a's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Fuel source changed
Heating controls upgraded for better temperature management
Hot water efficiency improved
Window efficiency improved
Cavity wall insulation installed
Roof insulation improved
Floor insulation added or improved
More low energy lighting installed
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Planning history
4a has no planning applications on record.
But the area is active
2 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£1,037,000
Modelled from EPC, postcode comparables.
£925,000
Recorded with HM Land Registry.
Sales timeline
15 November 2022Most recent
£925,000
Median price across the last 5 sales in SN4 9QN: £430,000 (2022–2003).
Nearby sales in SN4 9QN
4 Old Barn, Costow, Swindon, SN4 9QN
Sold Dec 2022
£1,000,0003 Costow Farm Cottages, Costow, Swindon, SN4 9QN
Sold Dec 2021
£430,000Willow Cottage, Costow, Swindon, SN4 9QN
Sold Aug 2019
£396,0003a The Bungalow, Costow, Swindon, SN4 9QN
Sold Jan 2006
£450,0001 Costow Farm Cottages, Costow, Swindon, SN4 9QN
Sold Apr 2003
£236,000
Versus the street
4a outperforms the street on epc rating by a wide margin.
Price per m²
£4,469
Street avg £4,665
Floor Area
207 m²
Street avg 120 m²
CO₂ Emissions
6.1 t/year
Street avg 5.5 t/year
Years Held
4 years
Street avg 9 years
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The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.7 km
Hay Lane — bus stop.
Closest school
1.4 km
Millbrook Primary School. 10 schools nearby.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
54.5dB

Night-time· 23:00 – 07:00
46.2dB







