1 Onslow Mews East, Kensington And Chelsea, London, SW7 3AA
About 1 Onslow Mews East
1 Onslow Mews East is a three-bedroom mid-terrace house in Kensington And Chelsea, London, London (SW7 3AA). It has a recorded floor area of 145 m² (around 1561 sq ft), construction records dating it to before 1900 and council tax band H. The latest certificate (May 2022) shows a D (score 56), a step below the typical UK home. Earlier certificates rated it C (February 2011); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Average to Very Poor. The recommended improvements would lift it to B (score 85), a 2-band jump.
Today's modelled estimate of £2,704,000 is 16.8% below the 2013 sale of £3,250,000, 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 (£2,082/sq ft) was about 96.5% above the typical sold price in the postcode. At 145 m² it sits well below the postcode median (224 m² across 4 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 75% of similar EPCs). 3 planning records sit against the property, 2 approved, 1 refused. Past consents include an extension, a basement excavation and a garage conversion, meaningful when judging how the property has evolved. 13 years since the last transfer (October 2013).
Know exactly what you're buying at 1 Onslow Mews East
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
- Bathrooms2
- Dining roomYes
- EnsuiteYes
Energy performance
1 Onslow Mews East's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls changed
Hot water efficiency decreased
More low energy lighting installed
Planning history
1 Onslow Mews East has an approved extension on the planning record.
- Sept 2019BasementFullIn report
Creation of single-storey basement extension
- Council
- Thurloe and Smith's Charity
Extension- Documents
- 22 docs on file
- Reference
- PP/19/03765
- Apr 2019BasementFullIn report
Excavation of basement under footprint of house and 50% of patio area. Creation of flat roof terrace at rear with repositioning of 2no. rooflights and addition of 1no. rooflight. ***WITHDRAWN***
- Council
- Thurloe and Smith's Charity
Extension- Documents
- 26 docs on file
- Reference
- PP/19/01618
We flagged 2 things worth checking at 1 Onslow Mews East
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
1 Onslow Mews East valuation sits well clear of the typical sold price in this postcode.
£2,704,000
Modelled from EPC, postcode comparables.
£3,250,000
Recorded with HM Land Registry.
Sales timeline
6 October 2013Most recent
£3,250,000
Median price across the last 5 sales in SW7 3AA: £1,950,000 (2015–2003).
Everything we know about 1 Onslow Mews East, 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 Mews East homes
1 Onslow Mews East is notably below the street on floor area.
EPC Rating
56 (D)
Street avg 68 (D)
Floor Area
145 m²
Street avg 209 m²
CO₂ Emissions
6.5 t/year
Street avg 6.2 t/year
Habitable Rooms
5 rooms
Street avg 5 rooms
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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
0.2 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
59.3dB

Night-time· 23:00 – 07:00
49.0dB