Flat 12, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
About Flat 12
Flat 12 is a three-bedroom end-of-terrace house in Kensington And Chelsea, London, London (SW7 3NJ). It has a recorded floor area of 116 m² (around 1249 sq ft), construction records dating it to 1900-1929 and council tax band H. At 116 m² this is the 5th 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 (April 2024) shows an E (score 48), well below the UK norm with real room to improve. The recommended improvements would push it to D (score 67).
Today's modelled estimate of £1,415,000 sits 152.7% above the 2024 sale of £560,000. On a £-per-square-foot basis, the last sale (£448/sq ft) was about 47.3% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs). Sold October 2024 for £560,000.
Know exactly what you're buying at Flat 12
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
- Bedrooms3
- Bathrooms3
Outside
- Communal gardenYes
Building
- LiftYes
- RefurbishedYes
Energy performance
Flat 12's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Planning history
Flat 12 has no planning applications on record.
Notable planning nearby
8applications of note in the surrounding area
We flagged 2 things worth checking at Flat 12
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 12 valuation sits well clear of the typical sold price in this postcode.
£1,415,000
Modelled from EPC, postcode comparables.
£560,000
Recorded with HM Land Registry.
Sales timeline
10 October 2024Most recent
£560,000
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 11, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
Sold Jul 2023
£1,600,000Flat 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 12, 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
Years Held for Flat 12 lags the street by a wide margin.
Price per m²
£4,828
Street avg £17,678
Floor Area
116 m²
Street avg 104 m²
Habitable Rooms
4 rooms
Street avg 4 rooms
CO₂ Emissions
7.1 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