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Get startedJefferson House, Flat 12, 11 Basil Street, Kensington And Chelsea, London, SW3 1AX
5 sales on record
About Jefferson House
A plain-English summary derived from public records, EPC certificates, sold prices and local data.
Jefferson House is a mid-terrace house in Kensington And Chelsea, London, London (SW3 1AX). It has a recorded floor area of 29 m² (around 312 sq ft) and construction records dating it to before 1900. At 29 m² this is the 19th smallest of 32 units on EPC record in Jefferson House, where floor areas span 12–229 m². The building's EPC ratings span D to C, with this unit at the top. The latest certificate (March 2016) shows a C (score 69), just inside the C band. The rating has held steady at C across 3 certificates since November 2008. The latest certificate is from March 2016, so improvements made since then won't be reflected.
Sale prices here have outpaced London HPI: 8.7% per year against 0% for the wider region. On a £-per-square-foot basis, the last sale (£1,538/sq ft) was about 80.7% above the typical sold price in the postcode. Last changed hands 9 years ago, in February 2017. Across the public record there are 5 sales, relatively high churn for a single property.
Energy performance
Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.
Jefferson House's carbon output is low for the local stock.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 07 Mar 2026
Sales history & valuation
Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
Price for Jefferson House has grown more than fourfold since the 1996 starting point.
Current estimate
See how we calculated this£454,000
Modelled from EPC, postcode comparables and a sale-price growth of 8.7% per year over 21 years.
Last sold (2017)
£480,000
Growth on file: 8.7% per year over 21 years.
Sales timeline
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The complete analysis of Jefferson House, Flat 12, 11 Basil Street, Kensington And Chelsea, London, SW3 1AX
Everything we know about this property, compiled into one in-depth, downloadable report.
Versus other Basil Street homes
Four headline reads against 32 similar flats on this street, drawn from the latest EPC and Land Registry data.
Price per m²
£16,552
Street avg £14,525
Floor Area
29 m²
Street avg 42 m²
Habitable Rooms
1 rooms
Street avg 1 rooms
Similar properties nearby
A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
The neighbourhood at a glance
A condensed read of the local area. Each tile links through to the full breakdown on the London district page.
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
Knightsbridge Station — tram stop.
Road noise across the postcode
Modelled day and night-time noise levels around SW3 1AX from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime· 07:00 – 23:00
58.3dB
Everything within walking distance
Schools, transport stops and scenic spots near this property — 81 points of interest in total.
Common questions
The questions buyers, sellers and homeowners most often ask about Jefferson House, Flat 12, 11 Basil Street, Kensington And Chelsea, London, SW3 1AX. Each answer is also embedded as structured data for search engines.