Flat 10, 25, Onslow Square has an Energy Performance Rating (EPC) of B. This is based on the most recent assessment, dated 06 May 2011.

The property is connected to mains gas and has partial double glazing. It is heated using community scheme.

According to HM Land Registry, Flat 10, 25, Onslow Square was last sold on 2nd August 2013 for £2,600,000 and was recorded as a leasehold flat.

The property has only had this single sale since 1995.

Since August 2013, the market for similar properties has dropped by 14.3%.

• Sold Aug 2013£2,600,000

According to the Land Registry and our network of Estate Agents, there have been 28 sales of properties similar to Flat 10, 25, Onslow Square within a radius of 280 metres since 2012.

The most recent example is Flat 2, Elystan Mansions 87, Elystan Street, London, SW3 3PA, a leasehold flat which sold for £1,750,000 on the 10th December 2025.

Read more about house prices in SW7.

• Sold Dec 2025£1,750,000 | 3 Bed FlatFlat 2, Elystan Mansions 87, Elystan Street, London, SW3 3PAFlat 2, Elystan Mansions 87, Elystan Street, London, SW3 3PA
• Sold Jun 2024£1,995,000 | 3 Bed FlatFlat 41, Melton Court, Onslow Crescent, London, SW7 3JHFlat 41, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold Sep 2023£2,110,000 | 3 Bed FlatFlat 40, Melton Court, Onslow Crescent, London, SW7 3JQFlat 40, Melton Court, Onslow Crescent, London, SW7 3JQ
• Sold Sep 2022£2,500,000 | 3 Bed FlatFlat 27, Malvern Court, Onslow Square, London, SW7 3HYFlat 27, Malvern Court, Onslow Square, London, SW7 3HY
• Sold Aug 2022£2,300,000 | 3 Bed FlatFlat 71, Melton Court, Onslow Crescent, London, SW7 3JHFlat 71, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold May 2022£2,350,000 | 4 Bed FlatFlat 48, Melton Court, Onslow Crescent, London, SW7 3JHFlat 48, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold May 2022£890,000 | 4 Bed FlatFlat 51, Melton Court, Onslow Crescent, London, SW7 3JHFlat 51, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold Jun 2021£1,800,000 | 4 Bed FlatFlat 36, Melton Court, Onslow Crescent, London, SW7 3JQFlat 36, Melton Court, Onslow Crescent, London, SW7 3JQ
• Sold Sep 2018£2,150,000 | 3 Bed FlatFlat 35, Melton Court, Onslow Crescent, London, SW7 3JQFlat 35, Melton Court, Onslow Crescent, London, SW7 3JQ
• Sold Apr 2018£2,000,000 | 3 Bed FlatFlat 19, Malvern Court, Onslow Square, London, SW7 3HUFlat 19, Malvern Court, Onslow Square, London, SW7 3HU
• Sold Mar 2018£5,000,000 | 3 Bed FlatFlat 1, 61, Onslow Square, London, SW7 3LSFlat 1, 61, Onslow Square, London, SW7 3LS
• Sold Jul 2016£3,600,000 | 3 Bed FlatFlat 8, 14, Onslow Square, London, SW7 3NPFlat 8, 14, Onslow Square, London, SW7 3NP
• Sold Jan 2016£1,500,000 | 3 Bed FlatFlat 45, Melton Court, Onslow Crescent, London, SW7 3JHFlat 45, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold Nov 2015£3,200,000 | 3 Bed FlatFlat 6, 14, Onslow Square, London, SW7 3NPFlat 6, 14, Onslow Square, London, SW7 3NP
• Sold Apr 2015£3,000,000 | 4 Bed FlatFlat 9, Malvern Court, Onslow Square, London, SW7 3HUFlat 9, Malvern Court, Onslow Square, London, SW7 3HU
• Sold Mar 2015£4,100,000 | 3 Bed FlatFlat 5, 61, Onslow Square, London, SW7 3LSFlat 5, 61, Onslow Square, London, SW7 3LS
• Sold Oct 2013£2,950,000 | 3 Bed FlatFlat 4, 6, Onslow Square, London, SW7 3NPFlat 4, 6, Onslow Square, London, SW7 3NP
• Sold Mar 2013£3,600,000 | 3 Bed FlatFlat 8, 25, Onslow Square, London, SW7 3NJFlat 8, 25, Onslow Square, London, SW7 3NJ
• Sold Jan 2013£2,800,000 | 3 Bed FlatFlat 39, Malvern Court, Onslow Square, London, SW7 3HYFlat 39, Malvern Court, Onslow Square, London, SW7 3HY
• Sold Sep 2012£518,619 | 3 Bed FlatFlat 3, 5, Onslow Square, London, SW7 3NJFlat 3, 5, Onslow Square, London, SW7 3NJ

Onslow Square, London, SW7 has a total of 321 addresses. According to our analysis of all the public data, Flat 10, 25, Onslow Square is the 77th largest and the 145th most expensive property on the street.

When compared to the postcode district it is £48k less expensive than the average property in SW7.

• Oratory Roman Catholic Primary School

  300 m away
• Marlborough Primary School

  400 m away
• Our Lady of Victories RC Primary School

  500 m away

• St. Thomas More Language College

  700 m away
• Chelsea Academy

  1.8 km away
• The London Oratory School

  1.9 km away

• South Kensington

  |

  200 m away
• Gloucester Road

  |

  700 m away
• Knightsbridge

  |

  1.0 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.