Flat 18, 27, Onslow Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 01 Apr 2026.

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

According to HM Land Registry, Flat 18, 27, Onslow Square was last sold on 1st October 2013 for £1,700,000 and was recorded as a leasehold flat.

The property has had 2 sales since 1995.

Since October 2013, the market for similar properties has risen by 2.7%.

• Sold Oct 2013£1,700,000
• Sold Jan 2004£320,000

According to the Land Registry and our network of Estate Agents, there have been 51 sales of properties similar to Flat 18, 27, Onslow Square within a radius of 290 metres since 2012.

The most recent example is Flat 29, Thurloe Court, Fulham Road, London, SW3 6SB, a leasehold flat which sold for £1,575,000 on the 19th June 2025.

Read more about house prices in SW7.

• Sold Jun 2025£1,575,000 | 3 Bed FlatFlat 29, Thurloe Court, Fulham Road, London, SW3 6SBFlat 29, Thurloe Court, Fulham Road, London, SW3 6SB
• Sold Mar 2025£1,300,000 | 3 Bed FlatFlat 18, Melton Court, Onslow Crescent, London, SW7 3JQFlat 18, Melton Court, Onslow Crescent, London, SW7 3JQ
• Sold Apr 2024£1,400,000 | 2 Bed FlatFlat 12, 27, Onslow Square, London, SW7 3NHFlat 12, 27, Onslow Square, London, SW7 3NH
• Sold Feb 2024£1,493,500 | 2 Bed FlatFlat 14, 27, Onslow Square, London, SW7 3NHFlat 14, 27, Onslow Square, London, SW7 3NH
• Sold Jan 2024£1,530,000 | 3 Bed FlatFlat 21, Petersham House 29-37, Harrington Road, London, SW7 3HDFlat 21, Petersham House 29-37, Harrington Road, London, SW7 3HD
• Sold Oct 2023£1,200,000 | 2 Bed FlatFlat 28, Petersham House 29-37, Harrington Road, London, SW7 3HDFlat 28, Petersham House 29-37, Harrington Road, London, SW7 3HD
• Sold Sep 2022£1,795,000 | 3 Bed FlatFlat 37, Thurloe Court, Fulham Road, London, SW3 6SBFlat 37, Thurloe Court, Fulham Road, London, SW3 6SB
• Sold Aug 2022£2,000,000 | 2 Bed FlatFlat 11, Petersham House 29-37, Harrington Road, London, SW7 3HDFlat 11, Petersham House 29-37, Harrington Road, London, SW7 3HD
• Sold Jul 2022£2,100,000 | 3 Bed FlatFlat 73, Melton Court, Onslow Crescent, London, SW7 3JHFlat 73, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold Mar 2022£1,560,000 | 3 Bed FlatFlat 9, Thurloe Court, Fulham Road, London, SW3 6SBFlat 9, Thurloe Court, Fulham Road, London, SW3 6SB
• Sold Oct 2021£430,000 | 3 Bed FlatFlat 6, 27, Onslow Square, London, SW7 3NHFlat 6, 27, Onslow Square, London, SW7 3NH
• Sold Nov 2019£905,000 | 2 Bed FlatFlat 24, Petersham House 29-37, Harrington Road, London, SW7 3HDFlat 24, Petersham House 29-37, Harrington Road, London, SW7 3HD
• Sold Oct 2019£2,000,000 | 3 Bed FlatFlat 46, Malvern Court, Onslow Square, London, SW7 3HYFlat 46, Malvern Court, Onslow Square, London, SW7 3HY
• Sold Oct 2018£1,200,000 | 2 Bed FlatFlat 19, Petersham House 29-37, Harrington Road, London, SW7 3HDFlat 19, Petersham House 29-37, Harrington Road, London, SW7 3HD
• Sold Oct 2018£1,300,000 | 3 Bed FlatFlat 30, Petersham House 29-37, Harrington Road, London, SW7 3HDFlat 30, Petersham House 29-37, Harrington Road, London, SW7 3HD
• Sold Sep 2017£1,700,000 | 2 Bed FlatFlat 10, 27, Onslow Square, London, SW7 3NHFlat 10, 27, Onslow Square, London, SW7 3NH
• Sold Oct 2014£2,275,000 | 2 Bed FlatFlat 9, 27, Onslow Square, London, SW7 3NHFlat 9, 27, Onslow Square, London, SW7 3NH
• Sold Sep 2014£1,625,000 | 2 Bed FlatFlat 1, 27, Onslow Square, London, SW7 3NHFlat 1, 27, Onslow Square, London, SW7 3NH
• Sold Feb 2013£1,375,000 | 2 Bed FlatFlat 8, 27, Onslow Square, London, SW7 3NHFlat 8, 27, Onslow Square, London, SW7 3NH
• Sold Jan 2012£1,751,000 | 2 Bed FlatFlat 17, 27, Onslow Square, London, SW7 3NHFlat 17, 27, Onslow Square, London, SW7 3NH

Onslow Square, London, SW7 has a total of 321 addresses. According to our analysis of all the public data, Flat 18, 27, Onslow Square is the 211th largest and the 242nd most expensive property on the street.

When compared to the postcode district it is £627k less expensive than the average property in SW7.

• Oratory Roman Catholic Primary School

  400 m away
• Our Lady of Victories RC Primary School

  400 m away
• Marlborough Primary School

  500 m away

• St. Thomas More Language College

  800 m away
• Chelsea Academy

  1.9 km away
• The London Oratory School

  1.9 km away

• South Kensington

  |

  100 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.