20, Onslow Square - SW7 3NP
Key Building Insights
20, Onslow Square is a residential building situated on Onslow Square, London, SW7 with 10 addresses.
It ranks as the 961st largest of the 1,226 buildings in the SW7 area.
The building contains a total of 10 properties: 5 flats and 5 other properties.
- Ave. Sale Price
- £1,545,537
- 10 Year change
- down 19.5%
- Ave. Rental Price
- £5,220pcm
- 10 Year change
- up 37.5%
- Ave. £ per ft²
- £1,769/ft²
- Ave. Gross Yield
- 4.1%/year/yr
Key Building Insights
20, Onslow Square is a residential building situated on Onslow Square, London, SW7 with 10 addresses.
It ranks as the 961st largest of the 1,226 buildings in the SW7 area.
The building contains a total of 10 properties: 5 flats and 5 other properties.
- Ave. Sale Price
- £1,545,537
- 10 Year change
- down 19.5%
- Ave. Rental Price
- £5,220pcm
- 10 Year change
- up 37.5%
- Ave. £ per ft²
- £1,769/ft²
- Ave. Gross Yield
- 4.1%/year/yr
Explore Properties on Onslow Square, London, SW7
- Flat 1, 20 Onslow Square
Period Flat
- Flat 2, 20 Onslow Square
Period Flat
- Flat 3, 20 Onslow Square
2 Bed Period Flat
- Flat 4, 20 Onslow Square
Period Flat
- Flat 5, 20 Onslow Square
Period Flat
Sales Market Trends
The last sale in 20, Onslow Square sold for £2,280,000 on 23rd December 2025. Since then prices are down an average of 2.1%.
The current average value in the building is £1,545,537.
The 20, Onslow Square Sales Market has decreased by 19.5% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| July 2026 | -3.5% | £1,545,537 |
| July 2025 | -3.5% | £1,601,494 |
| July 2024 | -3.8% | £1,659,507 |
| July 2023 | -3.8% | £1,725,888 |
| July 2022 | 4.3% | £1,793,715 |
| July 2021 | -1.3% | £1,719,534 |
| July 2020 | 2.9% | £1,742,893 |
| July 2019 | -1.2% | £1,693,974 |
| July 2018 | -4.5% | £1,713,791 |
| July 2017 | -6.5% | £1,795,243 |
| July 2016 | -3.1% | £1,919,269 |
| July 2015 | -0.8% | £1,980,787 |
| July 2014 | 15.1% | £1,996,320 |
| July 2013 | 5.5% | £1,734,978 |
| July 2012 | 13.6% | £1,644,305 |
| July 2011 | 14.3% | £1,446,938 |
| July 2010 | 14.9% | £1,266,057 |
| July 2009 | -4.1% | £1,102,222 |
| July 2008 | 5.5% | £1,149,504 |
| July 2007 | 0% | £1,089,232 |
Rental Market Trends
The current average rental value in the building is £5,220.
The 20, Onslow Square Rental Market has increased by 37.5% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| July 2026 | 6.6% | £5,220pcm |
| July 2025 | 3.6% | £4,899pcm |
| July 2024 | 0.9% | £4,730pcm |
| July 2023 | 10.2% | £4,688pcm |
| July 2022 | 23.4% | £4,255pcm |
| July 2021 | -2% | £3,448pcm |
| July 2020 | -8.3% | £3,518pcm |
| July 2019 | 3.5% | £3,838pcm |
| July 2018 | 1.7% | £3,709pcm |
| July 2017 | -3.9% | £3,648pcm |
| July 2016 | -4.6% | £3,798pcm |
| July 2015 | 1.8% | £3,983pcm |
| July 2014 | 0.5% | £3,913pcm |
| July 2013 | 1.1% | £3,895pcm |
| July 2012 | 1.1% | £3,852pcm |
| July 2011 | 8.3% | £3,811pcm |
| July 2010 | 16.5% | £3,519pcm |
| July 2009 | -11.5% | £3,022pcm |
| July 2008 | 2.7% | £3,413pcm |
| July 2007 | 0% | £3,324pcm |
Sales History
The last recorded sale was on 23rd December 2025 for £2,280,000 and since then the market in the area has decreased by 2.1%.
20, Onslow Square, London, SW7 3NP has had 3 sales since 1995, 1 of them in the last twelve months.
- Sold Dec 2025£2,280,000 | 3 Bed FlatFlat 8, 20, Onslow Square, London, SW7 3NPFlat 8, 20, Onslow Square, London, SW7 3NP
- Sold Jan 2017£6,200,000 | 2 Bed FlatFlat 5, 20, Onslow Square, London, SW7 3NPFlat 5, 20, Onslow Square, London, SW7 3NP
- Sold Jul 2006£485,000 | 2 Bed FlatFlat 9, 20, Onslow Square, London, SW7 3NPFlat 9, 20, Onslow Square, London, SW7 3NP
Energy Efficiency
- Energy Performance Certificate (EPC) surveys have been conducted for 5 properties.
- The most common rating is C.
- A (0)
- E (1)
- B (0)
- F (0)
- C (3)
- G (0)
- D (1)
- No EPC (5)
Top 3 Most Expensive Sales
- Sold Sep 2022£17,000,000 | 1 Bed Flat57, Onslow Square, London, SW7 3LR57, Onslow Square, London, SW7 3LR
- Sold Dec 2017£7,550,000 | 4 Bed FlatFlat 3, 32, Onslow Square, London, SW7 3NSFlat 3, 32, Onslow Square, London, SW7 3NS
- Sold May 2020£6,700,000 | 2 Bed FlatFlat 2, 38, Onslow Square, London, SW7 3NSFlat 2, 38, Onslow Square, London, SW7 3NS
Schools Nearby
- Oratory Roman Catholic Primary School300 m away
- Our Lady of Victories RC Primary School500 m away
- Marlborough Primary School500 m away
- St. Thomas More Language College700 m away
- Chelsea Academy1.7 km away
- The London Oratory School1.8 km away
More reading links
Public Transport Nearby
The closest station to 20, Onslow Square, London, SW7 3NP is South Kensington station, which is 200 metres away.
- South Kensington|200 m away
- Gloucester Road|700 m away
- Knightsbridge|1.1 km away
- Sloane Square|1.1 km away
