Flat 1, 6, Onslow Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 14 Nov 2019.

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

Since 2007 28 properties similar to Flat 1, 6, Onslow Square have sold within a radius of 280 metres, per the Land Registry and our network of Estate Agents.

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

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 Apr 2025£1,850,000 | 3 Bed FlatFlat 31, Malvern Court, Onslow Square, London, SW7 3HYFlat 31, Malvern Court, Onslow Square, London, SW7 3HY
• Sold Sep 2024£1,275,000 | 3 Bed FlatBasement, 109A, Onslow Square, London, SW7 3LUBasement, 109A, Onslow Square, London, SW7 3LU
• Sold Jul 2024£1,900,000 | 3 Bed Flat3, Rose Square, London, SW3 6RS3, Rose Square, London, SW3 6RS
• Sold Jul 2024£1,975,000 | 3 Bed FlatFlat 10, 14, Onslow Square, London, SW7 3NPFlat 10, 14, Onslow Square, London, SW7 3NP
• Sold Apr 2024£1,750,000 | 3 Bed FlatFlat 2B, Avenue Studios, Sydney Close, London, SW3 6HWFlat 2B, Avenue Studios, Sydney Close, London, SW3 6HW
• Sold Oct 2023£2,600,000 | 3 Bed FlatFlat 6, 89, Onslow Square, London, SW7 3LTFlat 6, 89, Onslow Square, London, SW7 3LT
• Sold Apr 2022£2,250,000 | 3 Bed FlatFlat 67, Melton Court, Onslow Crescent, London, SW7 3JHFlat 67, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold Dec 2021£2,185,000 | 3 Bed Flat45, Rose Square, London, SW3 6RS45, Rose Square, London, SW3 6RS
• Sold Jun 2021£1,800,000 | 2 Bed FlatFlat 7, 6, Onslow Square, London, SW7 3NPFlat 7, 6, Onslow Square, London, SW7 3NP
• Sold Jan 2021£2,450,000 | 3 Bed FlatFlat 4, 89, Onslow Square, London, SW7 3LTFlat 4, 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 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 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£1,850,000 | 3 Bed FlatFlat 7, 89, Onslow Square, London, SW7 3LTFlat 7, 89, Onslow Square, London, SW7 3LT
• Sold Sep 2012£518,619 | 3 Bed FlatFlat 3, 5, Onslow Square, London, SW7 3NJFlat 3, 5, Onslow Square, London, SW7 3NJ
• Sold Mar 2007£1,685,000 | 3 Bed FlatFlat 5, 89, Onslow Square, London, SW7 3LTFlat 5, 89, Onslow Square, London, SW7 3LT

Of the 321 addresses on Onslow Square, London, SW7, Flat 1, 6, Onslow Square comes out as the 183rd largest and the 155th most expensive in our analysis of the public data.

It is also £148k less expensive than the average property across the SW7 district.

• 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

The flood risk here is rated Very Low, based on Environment Agency data.