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Get startedBasil Mansions is a four-bedroom mid-terrace house in Kensington And Chelsea, London, London (SW3 1AP). It has a recorded floor area of 72 m² (around 775 sq ft) and construction records dating it to 1930-1949. The latest certificate (April 2025) shows a C (score 74). When first surveyed in May 2015 the rating was D, the property has climbed 1 band since. Between certificates, lighting went from Poor to Average. Main heating runs on electricity. At 72 m² this is the 8th smallest of 22 units on EPC record in Basil Mansions, where floor areas span 20–245 m². The building's EPC ratings span F to B across 22 units on file.
It hasn't traded since January 2004, a hold of 22 years that's notably long for the area. Across 2003–2004, sale prices here grew 0% per year, broadly in step with London's 0% HPI growth. Today's modelled estimate of £793,000 sits 98.3% above the 2004 sale of £400,000. On a £-per-square-foot basis, the last sale (£516/sq ft) was about 42.3% below the postcode norm. At 72 m² it sits well below the postcode median (188 m² across 21 EPCs), making it one of the more compact homes locally. One planning record on file: a basement excavation approved in 2006. Past consents include a basement excavation, meaningful when judging how the property has evolved.
Basil Mansions's carbon output is low for the local stock.
Conversion of two existing basement store rooms to provide part of flat 3B and the insertion of a window in the rear courtyard elevation of the building.
Basil Mansions changed hands twice within eighteen months — unusual for the area.
£793,000
Modelled from EPC, postcode comparables.
£400,000
Recorded with HM Land Registry.
Everything we know about this property, compiled into one in-depth, downloadable report.
CO₂ Emissions for Basil Mansions runs comfortably ahead of the street norm.
Price per m²
£5,556
Street avg £15,088
Floor Area
72 m²
Street avg 153 m²
Habitable Rooms
3 rooms
Rail-style transport is unusually close for this postcode.
Crime
9/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Sloane Street / Knightsbridge Station — bus stop.

Daytime· 07:00 – 23:00
58.2dB

Changes detected from historical EPC data
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
26 January 2004Most recent
£400,000
18 July 2003
£400,000
Median price across the last 5 sales in SW3 1AP: £3,600,000 (2024–2019).
Basil Mansions Flat 7 Basil Street Kensington And Chelsea London
Sold Oct 2024
Basil Mansions Flat 11 Basil Street Kensington And Chelsea London
Sold Jan 2024
Basil Mansions Flat 4b Basil Street Kensington And Chelsea London
Sold Aug 2023
Basil Mansions Flat 12 Basil Street Kensington And Chelsea London
Sold Jun 2022
Basil Mansions Flat 18 Basil Street Kensington And Chelsea London
Sold Jun 2019
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Street avg 4 rooms
CO₂ Emissions
0.3 t/year
Street avg 5.6 t/year
SW3 1RT
Closest school
0.8 km
Holy Trinity CofE Primary School. 51 schools nearby.
Night-time· 23:00 – 07:00
49.6dB