Flat 1, 5 Onslow Square, London, SW7 3NJ
About Flat 1
Flat 1 is a two-bedroom property in London (SW7 3NJ). It has council tax band F.
Held since October 2000 — that's 26 years off the open market, well above the local norm. 7 planning records sit against the property, 6 approved, 0 refused. Past consents include new windows and an extension, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. Across 1996–2000, sale prices on this property compounded at 18.9% per year.
Know exactly what you're buying at Flat 1
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
- Open-plan layoutYes
- Dining roomYes
Building
- RefurbishedYes
Energy performance
No EPC on record
This property doesn't have an Energy Performance Certificate yet. An EPC is required to sell or let — and unlocks our automated valuation.
Planning history
Flat 1 has a listed-building consent on record — alterations to a listed property are tightly controlled.
- Dec 2020Tree WorksTreesIn report
Prune 1 x Holly
- Council
- Thurloe and Smith's Charity
- Documents
- 6 docs on file
- Reference
- ARB/20/06213
- Apr 2018RenovationFullIn report
Alterations to fenestration at ground floor level including changing the swing of reception room double doors leading to communal garden area from inward to outward; removal of security gates; replacement of double glazing to French doors with security glass; replacement of obscured glass windows in upstairs bathroom with painted timber sash clear glass windows maintaining the existing 12cm external reveal
- Council
- Thurloe and Smith's Charity
New Windows- Documents
- 15 docs on file
- Reference
- PP/18/00902
We flagged 2 things worth checking at Flat 1
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
Sale price has at least doubled since 1996.
£300,000
Growth on file: 18.9% per year over 4 years.
Sales timeline
1 October 2000Most recent
£300,000
+104.1%over 4 years18 August 1996
£147,000
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 Flat 1, 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

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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