Flat 2, 1 Onslow Gardens, London, SW7 3LX
About Flat 2
Flat 2 is an end-of-terrace house in London (SW7 3LX). It has a recorded floor area of 270 m² (around 2906 sq ft), construction records dating it to before 1900 and council tax band H. At 270 m² this is the largest unit on EPC record across the building (47–270 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 (71 versus a worst of 54). The latest certificate (February 2016) shows a C (score 71). The recommended improvements would push it to B (score 84). The latest certificate is from February 2016, so improvements made since then won't be reflected.
Across 1995–2017, sale prices on this property compounded at 23.3% per year. Today's modelled estimate of £5,703,000 is 52.5% below the 2017 sale of £12,000,000, running counter to the wider postcode trend, which makes the EPC and condition history especially worth a look. On a £-per-square-foot basis, the last sale (£4,129/sq ft) was about 620.5% above the typical sold price in the postcode. At 270 m² the property is well over the postcode median (127 m² across 11 EPCs), placing it in the larger end of the local stock. 4 planning records sit against the property, 2 approved, 2 refused. Past consents include an extension and a conservatory, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. 9 years since the last transfer (September 2017).
Know exactly what you're buying at Flat 2
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
Energy performance
Flat 2's carbon output runs well above what efficient homes in the postcode produce.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 12 Feb 2026
EPC Rating
Planning history
Flat 2 has multiple listed-building consents on file — alterations need formal heritage approval.
- Oct 2020RenovationFullIn report
Extension of first floor terrace balustrade by 32cm to comply with safety standards: on South and West sides of terrace, installation of grey timber panels with internal metal structure; on North side, installation of light metal structure only, all fixed to interior side of original balustrade.***WITHDRAWN***
- Council
- Thurloe and Smith's Charity
Listed- Documents
- 17 docs on file
- Reference
- PP/20/04353
- Oct 2020RenovationHeritageIn report
Extension of first floor terrace balustrade by 32cm to comply with safety standards: on South and West sides of terrace, installation of grey timber panels with internal metal structure; on North side, installation of light metal structure only, all fixed to interior side of original balustrade.***WITHDRAWN***
- Council
- Thurloe and Smith's Charity
Listed- Documents
- 14 docs on file
- Reference
- LB/20/04354
We flagged 2 things worth checking at Flat 2
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
Latest sale on Flat 2 was the highest on Land Registry record across the postcode.
£5,703,000
Modelled from EPC, postcode comparables and a sale-price growth of 23.3% per year over 22 years.
£12,000,000
Growth on file: 23.3% per year over 22 years.
Sales timeline
20 September 2017Most recent
£12,000,000
+10069.5%over 22 years13 August 1995
£118,000
Median price across the last 5 sales in SW7 3LX: £422,000 (2022–2002).
Nearby sales in SW7 3LX
Flat 5, 1 Onslow Gardens, London, SW7 3LX
Sold Jan 2022
£313,750Flat 7, 1 Onslow Gardens, London, SW7 3LX
Sold Dec 2021
£1,500,000Flat 4, 1 Onslow Gardens, London, SW7 3LX
Sold Nov 2011
£900,000Flat 3, 4 Onslow Gardens, London, SW7 3LX
Sold Jul 2002
£395,000Flat 1, 1 Onslow Gardens, London, SW7 3LX
Sold Apr 2002
£1,500,000
Everything we know about Flat 2, 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 price per m², Flat 2 stands well clear of the street.
Price per m²
£44,444
Street avg £12,886
Floor Area
270 m²
Street avg 132 m²
Habitable Rooms
5 rooms
Street avg 4 rooms
CO₂ Emissions
7.2 t/year
Street avg 4.8 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. 61 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
59.1dB

Night-time· 23:00 – 07:00
48.8dB