1 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
About 1 Onslow Square
1 Onslow Square is a two-bedroom end-of-terrace house in Kensington And Chelsea, London, London (SW7 3NJ). It has a recorded floor area of 110 m² (around 1181 sq ft), construction records dating it to before 1900 and council tax band G. The latest certificate (November 2010) shows a D (score 61), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since April 2010. Between certificates, hot-water efficiency dropped from Good to Average. The latest certificate is from November 2010, so improvements made since then won't be reflected. At 110 m² this is the 8th smallest of 15 units on EPC record in the building, where floor areas span 34–173 m². The building's EPC ratings span F to B across 15 units on file. Period features are noted in the property record.
14 planning records sit against the property, 14 approved, 0 refused. Past consents include tree works, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations.
Know exactly what you're buying at 1 Onslow Square
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
- EnsuiteYes
Outside
- Communal gardenYes
Building
- Period featuresYes
Energy performance
1 Onslow Square's EPC is over a decade old — improvements since won't be reflected.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 26 Nov 2020
EPC Rating
Planning history
1 Onslow Square has a listed-building consent on record — alterations to a listed property are tightly controlled.
- Mar 2023HeritageIn report
Installation of garden gate, historically recovered from Park House to rear Wellcome Trust communal garden at 1-7 Onslow Square.
- Council
- Thurloe and Smith's Charity
- Documents
- 14 docs on file
- Reference
- LB/23/00156
- Mar 2023FullIn report
Installation of garden gate, historically recovered from Park House to rear Wellcome Trust communal garden at 1-7 Onslow Square.
- Council
- Thurloe and Smith's Charity
- Documents
- 22 docs on file
- Reference
- PP/23/00155
We flagged 2 things worth checking at 1 Onslow Square
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 Square has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£1,282,000
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 3NJ: £2,800,000 (2024–2022).
Nearby sales in SW7 3NJ
Flat 2, 23 Onslow Square, London, SW7 3NJ
Sold Nov 2024
£2,825,000Flat 12, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
Sold Oct 2024
£560,000Flat 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
£3,600,000
Everything we know about 1 Onslow Square, 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
EPC Rating
61 (D)
Street avg 66 (D)
Floor Area
110 m²
Street avg 104 m²
CO₂ Emissions
5.2 t/year
Street avg 4.1 t/year
Habitable Rooms
4 rooms
Street avg 4 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
0.1 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