Flat 11, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
About Flat 11
Flat 11 is a two-bedroom mid-terrace house in Kensington And Chelsea, London, London (SW7 3NJ). It has a recorded floor area of 94 m² (around 1012 sq ft), construction records dating it to 1950-1966 and council tax band G. At 94 m² this is the 4th smallest of 8 units on EPC record in the building, where floor areas span 40–173 m². The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (48 versus a best of 84). The latest certificate (March 2022) shows an E (score 48), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since June 2009. Between certificates, window efficiency went from Very Poor to Good and lighting went from Average to Very Good. The recommended improvements would lift it to C (score 77), a 2-band jump.
It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs). On a £-per-square-foot basis, the last sale (£1,581/sq ft) was about 108.9% above the typical sold price in the postcode. Sold July 2023 for £1,600,000. One historical planning record sits against the property in 2023.
Know exactly what you're buying at Flat 11
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Launch offer · save £5
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms2
- Bathrooms2
Energy performance
Flat 11's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Changed to a more efficient fuel source
Single glazing replaced with double or better glazing
More low energy lighting installed
Planning history
- Nov 2023RenovationHeritageIn report
Internal refurbishment to include the replacement of internal finishes, fixtures and services; partial demolition of existing, non-load bearing partitions; reposition of the en-suite bathroom and layout; replacement of floor finishes with new engineered wood flooring, porcelain tiling and carpeted bedroom (replacing like for like); new stud partitions will be erected to allow for the creation of bedroom 3.
- Council
- Thurloe and Smith's Charity
- Documents
- 21 docs on file
- Reference
- LB/23/05779
We flagged 2 things worth checking at Flat 11
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
- Signs of HMO activity in the area
- Larger development activity nearby
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Sales history & valuation
Flat 11 valuation sits well clear of the typical sold price in this postcode.
£1,524,000
Modelled from EPC, postcode comparables.
£1,600,000
Recorded with HM Land Registry.
Sales timeline
27 July 2023Most recent
£1,600,000
Median price across the last 5 sales in SW7 3NJ: £2,800,000 (2024–2021).
Nearby sales in SW7 3NJ
Flat 2, 23 Onslow Square, London, SW7 3NJ
Sold Nov 2024
£2,825,000Flat 12, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
Sold Oct 2024
£560,000Flat 3, 23 Onslow Square, London, SW7 3NJ
Sold May 2023
£2,800,000Flat 1, 17 Onslow Square, London, SW7 3NJ
Sold Aug 2022
£3,600,000Flat 1, 11 Onslow Square, London, SW7 3NJ
Sold Mar 2021
£2,300,000
Everything we know about Flat 11, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Signs of HMO activity in the area
- Larger development activity nearby
Versus other Onslow Square homes
EPC Rating for Flat 11 lags the street by a wide margin.
Price per m²
£17,021
Street avg £17,097
Floor Area
94 m²
Street avg 105 m²
Habitable Rooms
3 rooms
Street avg 4 rooms
CO₂ Emissions
6.1 t/year
Street avg 4.1 t/year
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
10/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Onslow Square — bus stop.
Closest school
0.3 km
Oratory Roman Catholic Primary School. 58 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode
Daytime· 07:00 – 23:00
58.4dB
Night-time· 23:00 – 07:00
48.1dB