Flat 9, 20, Onslow Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 08 May 2025.

The property is connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

Flat 9, 20, Onslow Square last changed hands on 4th July 2006, selling for £485,000. The transaction was logged as a leasehold flat by HM Land Registry.

That is its only recorded sale since 1995.

• Sold Jul 2006£485,000

Land Registry records and our Estate Agent network show 16 sales of comparable properties within 280 metres of Flat 9, 20, Onslow Square since 2007.

Most recently, 11, Rose Square, London, SW3 6RS, a leasehold flat, sold at £1,280,000 on the 25th November 2025.

Read more about house prices in SW7.

• Sold Nov 2025£1,280,000 | 2 Bed Flat11, Rose Square, London, SW3 6RS11, Rose Square, London, SW3 6RS
• Sold Dec 2023£800,000 | 2 Bed FlatFlat 1, 181, Fulham Road, London, SW3 6JNFlat 1, 181, Fulham Road, London, SW3 6JN
• Sold Dec 2022£800,000 | 2 Bed FlatFlat 7, 161, Fulham Road, London, SW3 6SNFlat 7, 161, Fulham Road, London, SW3 6SN
• Sold Sep 2022£718,000 | 2 Bed Flat61A, Onslow Square, London, SW7 3LS61A, Onslow Square, London, SW7 3LS
• Sold Dec 2021£1,300,000 | 2 Bed FlatFlat 2, 23, Sumner Place, London, SW7 3EGFlat 2, 23, Sumner Place, London, SW7 3EG
• Sold Jun 2021£499,999 | 2 Bed FlatFlat 3, 161, Fulham Road, London, SW3 6SNFlat 3, 161, Fulham Road, London, SW3 6SN
• Sold Jun 2021£2,300,000 | 2 Bed FlatFlat 3, 97, Onslow Square, London, SW7 3LUFlat 3, 97, Onslow Square, London, SW7 3LU
• Sold Jul 2019£725,000 | 2 Bed FlatFlat 28, Thurloe Court, Fulham Road, London, SW3 6SBFlat 28, Thurloe Court, Fulham Road, London, SW3 6SB
• Sold Oct 2018£1,030,000 | 2 Bed FlatFlat 3, 35, Sydney Street, London, SW3 6PUFlat 3, 35, Sydney Street, London, SW3 6PU
• Sold Jan 2017£6,200,000 | 2 Bed FlatFlat 5, 20, Onslow Square, London, SW7 3NPFlat 5, 20, Onslow Square, London, SW7 3NP
• Sold Jan 2015£3,250,000 | 2 Bed Flat55A, Sydney Street, London, SW3 6PX55A, Sydney Street, London, SW3 6PX
• Sold Mar 2012£1,500,000 | 2 Bed FlatFlat 2, 105, Onslow Square, London, SW7 3LUFlat 2, 105, Onslow Square, London, SW7 3LU
• Sold Aug 2010£484,600 | 2 Bed Flat105A, Onslow Square, London, SW7 3LU105A, Onslow Square, London, SW7 3LU
• Sold Jun 2008£497,500 | 2 Bed FlatFlat 10, 161, Fulham Road, London, SW3 6SNFlat 10, 161, Fulham Road, London, SW3 6SN
• Sold Mar 2007£248,000 | 2 Bed Flat67A, Onslow Square, London, SW7 3LS67A, Onslow Square, London, SW7 3LS
• Sold Feb 2007£5,400,000 | 2 Bed Flat8, Rose Square, London, SW3 6RS8, Rose Square, London, SW3 6RS

Our analysis of the public data ranks Flat 9, 20, Onslow Square as the 293rd largest and the 280th most expensive of the 321 addresses on Onslow Square, London, SW7.

Against the SW7 postcode district average, it is £896k less expensive than the typical property.

• Oratory Roman Catholic Primary School

  300 m away
• Our Lady of Victories RC Primary School

  500 m away
• Marlborough Primary School

  500 m away

• St. Thomas More Language College

  700 m away
• Chelsea Academy

  1.7 km away
• The London Oratory School

  1.8 km away

• South Kensington

  |

  200 m away
• Gloucester Road

  |

  700 m away
• Knightsbridge

  |

  1.1 km away

Environment Agency data suggests this area has a Very Low risk of flooding.