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Get started21 Allen Road is a three-bedroom mid-terrace house in Sunbury On Thames (TW16 5LS). It has a recorded floor area of 103 m² (around 1109 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (October 2024) shows a C (score 71). When first surveyed in June 2010 the rating was D, the property has climbed 1 band since. Between certificates, lighting went from Good to Very Good; while wall efficiency dropped from Poor to Very Poor. The recommended improvements would push it to B (score 84). The property has solar panels on record, all of which lower running costs and tend to lift resale appeal. Other recorded features include a loft. Records show the property has been extended at some point in its history.
Sale prices here have outpaced England HPI: 4% per year against 0% for the wider region. Most recent transfer was March 2025 at £499,950 — fresh data. 2 planning records sit against the property, 1 approved, 1 refused. Past consents include a loft conversion, meaningful when judging how the property has evolved. At 103 m² it's 27.2% larger than the typical home in the postcode (81 m² median across 30 EPCs).
Loft conversion involving a rear dormer roof addition
21 Allen Road valuation sits well clear of the typical sold price in this postcode.
£529,000
Modelled from EPC, postcode comparables and a sale-price growth of 4.0% per year over 12 years.
£499,950
Growth on file: 4.0% per year over 12 years.
21 Allen Road outperforms the street on habitable rooms by a wide margin.
Price per m²
£4,854
Street avg £4,920
Floor Area
103 m²
Street avg 82 m²
Habitable Rooms
5 rooms
Rail-style transport is unusually close for this postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Bowater Gardens — bus stop.

Daytime· 07:00 – 23:00
50.8dB

Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Low energy lighting percentage decreased
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
A loft conversion including a rear dormer roof addition.
25 March 2025Most recent
£499,950
+58.7%over 11 years9 July 2013
£315,000
Median price across the last 5 sales in TW16 5LS: £434,000 (2025–2022).
Street avg 4 rooms
CO₂ Emissions
3.2 t/year
Street avg 2.3 t/year
TW16 5BP
Closest school
0.2 km
Chennestone Primary School. 22 schools nearby.
Night-time· 23:00 – 07:00
42.1dB
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