Flat 5, 90 Onslow Gardens, London, SW7 3BS
About Flat 5
Flat 5 is a two-bedroom mid-terrace house in London (SW7 3BS). It has a recorded floor area of 130 m² (around 1399 sq ft) and construction records dating it to before 1900. At 130 m² this is the 4th smallest of 5 units on EPC record in the building, where floor areas span 44–150 m². The building's EPC ratings span E to C, with this unit at the top. On EPC score it ranks first in the building (77 versus a worst of 43). Other recorded features include a balcony. The latest certificate (February 2023) shows a C (score 77), near the top of the C band. When first surveyed in September 2009 the rating was D, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to B (score 84).
Across 1997–2015, sale prices on this property compounded at 9.9% per year. Today's modelled estimate of £1,910,000 is 13.2% below the 2015 sale of £2,200,000, an unusual pattern given regional price growth and worth checking against the EPC condition. On a £-per-square-foot basis, the last sale (£1,572/sq ft) was about 72.3% above the typical sold price in the postcode. At 130 m² the property is well over the postcode median (66 m² across 26 EPCs), placing it in the larger end of the local stock. 6 planning records sit against the property, 2 approved, 4 refused. Past consents include subdivision, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. Last changed hands 11 years ago, in April 2015. Across the public record there are 4 sales, relatively high churn for a single property.
Know exactly what you're buying at Flat 5
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
- Bathrooms1
- Dining roomYes
Outside
- Communal gardenYes
- BalconyYes
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Changed to a more efficient fuel source
Heating controls changed
Fuel source changed
More low energy lighting installed
Planning history
Council records show a subdivision application — the property's legal arrangement has been altered.
- Nov 2013SubdivisionHeritageIn report
Internal alterations to Flats 3 and 5 (upper ground and first floors) for conversion into one single apartment (Proposal A) ***WITHDRAWN***
- Council
- Thurloe and Smith's Charity
Listed- Documents
- 13 docs on file
- Reference
- LB/13/05662
- Nov 2013SubdivisionHeritageIn report
Internal alterations to Flats 3 and 5 (upper ground and first floors) for conversion into one single apartment (Proposal C) ***WITHDRAWN***
- Council
- Thurloe and Smith's Charity
- Documents
- 13 docs on file
- Reference
- LB/13/05660
We flagged 2 things worth checking at Flat 5
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
Price for Flat 5 has grown more than fourfold since the 1997 starting point.
£1,910,000
Modelled from EPC, postcode comparables and a sale-price growth of 9.9% per year over 18 years.
£2,200,000
Growth on file: 9.9% per year over 18 years.
Sales timeline
15 April 2015Most recent
£2,200,000
+246.5%over 14 years18 September 2000
£635,000
+1.3%over 10 months29 November 1999
£627,100
+56.8%over 2 years14 March 1997
£400,000
Median price across the last 5 sales in SW7 3BS: £935,000 (2024–2020).
Nearby sales in SW7 3BS
Flat 5, 88 Onslow Gardens, London, SW7 3BS
Sold Apr 2024
£1,030,00088 Onslow Gardens, Kensington And Chelsea, London, SW7 3BS
Sold Aug 2023
£75,524Flat 1, 90 Onslow Gardens, London, SW7 3BS
Sold Jan 2021
£590,000Flat 1, 88 Onslow Gardens, London, SW7 3BS
Sold Sept 2020
£4,550,000Flat 2, 88 Onslow Gardens, London, SW7 3BS
Sold Aug 2020
£2,000,000
Everything we know about Flat 5, 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 Gardens homes
On epc rating, Flat 5 stands well clear of the street.
Price per m²
£16,923
Street avg £16,022
Floor Area
130 m²
Street avg 82 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
3.5 t/year
Street avg 3.0 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
0.2 km
Onslow Gardens South Kensington — bus stop.
Closest school
0.3 km
Our Lady of Victories RC Primary School. 60 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
58.0dB

Night-time· 23:00 – 07:00
47.6dB