Our Data Sources
Flat 5, 21, Onslow Gardens has a single entry in the Land Registry from February 2026 and a single entry in the EPC database dated April 2019.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 3 out of 5 and is considered of medium accuracy.
Price Range & Condition
In very good condition, we estimate Flat 5, 21, Onslow Gardens would be worth £3,832,275, with a potential rental value of £9,943 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £3,394,301, with a rental value of £8,807 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Energy Efficiency
Flat 5, 21, Onslow Gardens has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 03 Apr 2019.
The property is connected to mains gas and has single glazed windows. It is heated using Boiler and radiators, mains gas.
Sold Prices
Flat 5, 21, Onslow Gardens last changed hands on 13th February 2026, selling for £3,700,000. The transaction was logged as a leasehold flat by HM Land Registry.
That is its only recorded sale since 1995.
The market for similar properties has dropped by 27.7% since February 2026.
- Sold Feb 2026£3,700,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 19 sales of comparable properties within 230 metres of Flat 5, 21, Onslow Gardens across the last 2 years.
Most recently, Flat 3, 26, Onslow Gardens, London, SW7 3AG, a leasehold flat, sold at £3,500,000 on the 28th March 2025.
Read more about house prices in SW7.
- Sold Mar 2025£3,500,000 | 3 Bed FlatFlat 3, 26, Onslow Gardens, London, SW7 3AGFlat 3, 26, Onslow Gardens, London, SW7 3AG
- Sold Jun 2022£3,500,000 | 3 Bed Flat65, Rose Square, London, SW3 6RS65, Rose Square, London, SW3 6RS
- Sold Feb 2020£3,870,000 | 3 Bed Flat68, Rose Square, London, SW3 6RS68, Rose Square, London, SW3 6RS
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Our analysis of the public data ranks Flat 5, 21, Onslow Gardens as the 54th largest and the 30th most expensive of the 504 addresses on Onslow Gardens, London, SW7.
Against the SW7 postcode district average, it is £1.558m more expensive than the typical property.
More reading links
Schools Nearby
- Our Lady of Victories RC Primary School300 m away
- Oratory Roman Catholic Primary School500 m away
- Bousfield Primary School600 m away
- St. Thomas More Language College1.1 km away
- Chelsea Academy1.5 km away
- The London Oratory School1.5 km away
More reading links
Public Transport Nearby
- South Kensington|400 m away
- Gloucester Road|500 m away
- Earl's Court|1.1 km away
Available Internet Speeds
Ofcom's latest figures show superfast broadband available in this area.
According to recent data from Ofcom, Superfast Broadband is available in the area.
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
