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Get startedBasement Flat is a mid-terrace house in London (SW1X 9RX). It has a recorded floor area of 35 m² (around 377 sq ft) and construction records dating it to before 1900. The latest certificate (December 2022) shows a C (score 69), just inside the C band. When first surveyed in October 2011 the rating was F, the property has climbed 3 bands since. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Very Poor to Good and hot-water efficiency went from Very Poor to Good.
At 35 m² it sits well below the postcode median (161 m² across 23 EPCs), making it one of the more compact homes locally.
Basement Flat has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£669,000
Modelled from EPC, postcode comparables.
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Everything we know about this property, compiled into one in-depth, downloadable report.
Detailed AI analysis
An AI-written breakdown of everything that matters
Floor Area for Basement Flat lags the street by a wide margin.
EPC Rating
69 (C)
Street avg 69 (D)
Floor Area
35 m²
Street avg 179 m²
CO₂ Emissions
1.7 t/year
Street avg 5.9 t/year
Rail-style transport is unusually close for this postcode.
Crime
5/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Pont Street — bus stop.

Daytime· 07:00 – 23:00
59.3dB

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Changes detected from historical EPC data
Upgraded to gas central heating
Hot water system upgraded
Single glazing replaced with double or better glazing
More low energy lighting installed
Wall insulation improved
Low energy lighting percentage decreased
Are we missing something? Tell us about home improvements to help adjust your valuation.
Median price across the last 5 sales in SW1X 9RX: £5,250,000 (2025–2016).
Flat 1 37 Cadogan Place London
Sold Apr 2025
39 Cadogan Place Kensington And Chelsea London
Sold Apr 2023
Flat 2 37 Cadogan Place London
Sold Sept 2022
34 35 Third Floor Flat Cadogan Place London
Sold Dec 2012
36 Cadogan Place Kensington And Chelsea London
Sold Nov 2007
Detailed EPC data
Full energy ratings, history and recommendations
Full planning history
Every application and decision on record
Plus much more
Comparable sales, transport, crime, schools and more

Habitable Rooms
2 rooms
Street avg 5 rooms
SW1X 9RX
Closest school
0.4 km
Holy Trinity CofE Primary School. 55 schools nearby.
Night-time· 23:00 – 07:00
49.6dB