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Get started9 Castle Close is an end-of-terrace house in Sunbury On Thames (TW16 7DU). It has a recorded floor area of 48 m² (around 517 sq ft), construction records dating it to 1983-1990 and council tax band C. The latest certificate (April 2023) shows a D (score 67), on the cusp of jumping into the C band. When first surveyed in February 2017 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Poor to Good, lighting went from Very Poor to Good and main heating went from Very Poor to Average; while hot-water efficiency dropped from Poor to Very Poor. The recommended improvements would push it to C (score 75). Main heating runs on electricity.
It hasn't traded since April 2002, a hold of 24 years that's notably long for the area. Sale prices here have outpaced England HPI: 16.9% per year against 0% for the wider region. Today's modelled estimate of £289,000 sits 117.4% above the 2002 sale of £132,950. On a £-per-square-foot basis, the last sale (£257/sq ft) was about 15.5% below the postcode norm. 2 planning records sit against the property, 1 approved, 1 refused. Past consents include an extension and a conservatory, meaningful when judging how the property has evolved. At 48 m² it's 20% smaller than the typical home in the postcode (60 m² median across 14 EPCs).
9 Castle Close has 2 separate extension applications on the council record.
9 Castle Close's modelled value sits at over four times its earliest registered sale price (1998).
£289,000
Modelled from EPC, postcode comparables and a sale-price growth of 16.9% per year over 4 years.
£132,950
Growth on file: 16.9% per year over 4 years.
9 Castle Close is notably below the street on floor area.
Price per m²
£2,770
Street avg £4,030
Floor Area
48 m²
Street avg 62 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
Rail-style transport is unusually close for this postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Windmill Road — bus stop.

Daytime· 07:00 – 23:00
56.0dB

Changes detected from historical EPC data
Heating system upgraded to a more efficient system
Heating controls changed
Hot water efficiency decreased
Wall insulation upgraded
Heat pump installed, significantly improving energy efficiency
Heating controls upgraded for better temperature management
Wall insulation upgraded
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
Extension: Rear of property
Erection of conservatory to the rear.
Extension: Rear of property
Erection of a conservatory to the rear
5 April 2002Most recent
£132,950
+87.3%over 4 years27 March 1998
£71,000
Median price across the last 5 sales in TW16 7DU: £276,500 (2025–2021).
CO₂ Emissions
1.9 t/year
Street avg 3.3 t/year
Closest school
0.7 km
Springfield Primary School. 23 schools nearby.
Night-time· 23:00 – 07:00
47.4dB
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