Flat 3, 5, Onslow Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 07 Jan 2022.

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

According to HM Land Registry, Flat 3, 5, Onslow Square was last sold on 20th September 2012 for £518,619 and was recorded as a leasehold flat.

The property has had 3 sales since 1995.

Since September 2012, the market for similar properties has dropped by 7.9%.

• Sold Sep 2012£518,619
• Sold Oct 2009£1,600,000
• Sold May 2005£1,248,000

According to the Land Registry and our network of Estate Agents, there have been 22 sales of properties similar to Flat 3, 5, Onslow Square within a radius of 280 metres since 2007.

The most recent example is Flat 8, 20, Onslow Square, London, SW7 3NP, a leasehold flat which sold for £2,280,000 on the 23rd December 2025.

Read more about house prices in SW7.

• Sold Dec 2025£2,280,000 | 3 Bed FlatFlat 8, 20, Onslow Square, London, SW7 3NPFlat 8, 20, Onslow Square, London, SW7 3NP
• Sold Jun 2025£2,200,000 | 3 Bed FlatFlat 9, 14, Onslow Square, London, SW7 3NPFlat 9, 14, Onslow Square, London, SW7 3NP
• Sold Jul 2024£1,975,000 | 3 Bed FlatFlat 10, 14, Onslow Square, London, SW7 3NPFlat 10, 14, Onslow Square, London, SW7 3NP
• Sold Oct 2023£2,600,000 | 3 Bed FlatFlat 6, 89, Onslow Square, London, SW7 3LTFlat 6, 89, Onslow Square, London, SW7 3LT
• Sold Sep 2017£632,000 | 3 Bed FlatFlat 1, 81, Onslow Square, London, SW7 3LTFlat 1, 81, Onslow Square, London, SW7 3LT
• Sold Mar 2017£2,500,000 | 3 Bed FlatFlat 2, 89, Onslow Square, London, SW7 3LTFlat 2, 89, Onslow Square, London, SW7 3LT
• Sold Jan 2017£3,000,000 | 3 Bed Flat63, Onslow Square, London, SW7 3LS63, 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 Feb 2016£2,550,000 | 3 Bed FlatFlat 1, 46, Onslow Square, London, SW7 3NXFlat 1, 46, Onslow Square, London, SW7 3NX
• Sold Dec 2015£2,850,000 | 3 Bed FlatFlat 4, 5, Onslow Square, London, SW7 3NJFlat 4, 5, Onslow Square, London, SW7 3NJ
• Sold Nov 2015£3,200,000 | 3 Bed FlatFlat 6, 14, Onslow Square, London, SW7 3NPFlat 6, 14, Onslow Square, London, SW7 3NP
• Sold Jul 2014£1,999,000 | 3 Bed FlatFlat 4, 14, Onslow Square, London, SW7 3NPFlat 4, 14, Onslow Square, London, SW7 3NP
• Sold Oct 2013£2,950,000 | 3 Bed FlatFlat 4, 6, Onslow Square, London, SW7 3NPFlat 4, 6, Onslow Square, London, SW7 3NP
• Sold Aug 2013£2,600,000 | 3 Bed FlatFlat 10, 25, Onslow Square, London, SW7 3NJFlat 10, 25, Onslow Square, London, SW7 3NJ
• Sold Jun 2013£2,850,000 | 3 Bed FlatFlat 7, 97, Onslow Square, London, SW7 3LUFlat 7, 97, Onslow Square, London, SW7 3LU
• Sold Mar 2013£1,850,000 | 3 Bed FlatFlat 7, 89, Onslow Square, London, SW7 3LTFlat 7, 89, Onslow Square, London, SW7 3LT
• Sold Jan 2011£2,250,000 | 3 Bed FlatFlat 3, 89, Onslow Square, London, SW7 3LTFlat 3, 89, Onslow Square, London, SW7 3LT
• Sold Feb 2010£1,030,000 | 3 Bed FlatFlat 6, 6, Onslow Square, London, SW7 3NPFlat 6, 6, Onslow Square, London, SW7 3NP
• Sold Nov 2008£2,400,000 | 3 Bed Flat50, Rose Square, London, SW3 6RS50, Rose Square, London, SW3 6RS
• Sold Mar 2007£1,685,000 | 3 Bed FlatFlat 5, 89, Onslow Square, London, SW7 3LTFlat 5, 89, Onslow Square, London, SW7 3LT

Onslow Square, London, SW7 has a total of 321 addresses. According to our analysis of all the public data, Flat 3, 5, Onslow Square is the 134th largest and the 135th most expensive property on the street.

When compared to the postcode district it is £38k more 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.