1a, Onslow Gardens, Kensington And Chelsea, London, SW7 3LX
About 1a
1a is a two-bedroom semi-detached house in Kensington And Chelsea, London, London (SW7 3LX). It has a recorded floor area of 164 m² (around 1765 sq ft) and construction records dating it to before 1900. The latest certificate (January 2021) shows a D (score 57), a step below the typical UK home. The recommended improvements would push it to C (score 78).
At 164 m² it's 29.1% larger than the typical home in the postcode (127 m² median across 11 EPCs). 2 planning records sit against the property, 2 approved, 0 refused.
Know exactly what you're buying at 1a
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
Outside
- Private gardenYes
Building
- RefurbishedYes
Energy performance
1a's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Planning history
- Sept 2001RenovationFullIn report
Replacement and repair of entrance terrace paving and waterproofing membrane; realignment of entrance gate and replacement of existing stone steps.
- Council
- Thurloe and Smith's Charity
- Reference
- PP/01/01891
- Sept 2001RenovationHeritageIn report
Replacement and repair of entrance terrace paving and waterproofing membrane; realignment of entrance gate and replacement of existing stone steps.
- Council
- Thurloe and Smith's Charity
- Reference
- LB/01/01892
We flagged 2 things worth checking at 1a
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
1a has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£2,919,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
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.
Median price across the last 5 sales in SW7 3LX: £900,000 (2022–2011).
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 2, 1 Onslow Gardens, London, SW7 3LX
Sold Sept 2017
£12,000,000Flat 4, 1 Onslow Gardens, London, SW7 3LX
Sold Nov 2011
£900,000Flat 3, 4 Onslow Gardens, London, SW7 3LX
Sold Jul 2002
£395,000
Everything we know about 1a, 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
EPC Rating
57 (D)
Street avg 66 (D)
Floor Area
164 m²
Street avg 141 m²
CO₂ Emissions
7.1 t/year
Street avg 4.8 t/year
Habitable Rooms
4 rooms
Street avg 4 rooms
Similar properties nearby
1 Onslow Gardens, Kensington And Chelsea
SW7 3LX
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SW7 3JW
1 Cranley Mews, Kensington And Chelsea
SW7 3BX
1 Onslow Mews East, Kensington And Chelsea
SW7 3AA
1 Cranley Gardens, Kensington And Chelsea
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1 Onslow Square, Kensington And Chelsea
SW7 3NJ
10 Cranley Mews, Kensington And Chelsea
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1 Onslow Mews West, Kensington And Chelsea
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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