Flat 3, 14, Onslow Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 28 May 2019.

The property is connected to mains gas and has single glazed windows. It is heated using community scheme.

The most recent sale of Flat 3, 14, Onslow Square completed on 15th January 2010 at £2,600,000 and was recorded by HM Land Registry as a leasehold flat.

Since 1995 the property has sold twice.

Values of comparable properties have risen by 28.5% over the period since January 2010.

• Sold Jan 2010£2,600,000
• Sold Sep 2007£2,500,000

Since 2007 20 properties similar to Flat 3, 14, Onslow Square have sold within a radius of 270 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 15th August 2025, was Flat 10, 81, Onslow Square, London, SW7 3LT, a leasehold flat which sold for £2,500,000.

Read more about house prices in SW7.

• Sold Aug 2025£2,500,000 | 3 Bed FlatFlat 10, 81, Onslow Square, London, SW7 3LTFlat 10, 81, Onslow Square, London, SW7 3LT
• Sold Mar 2025£2,950,000 | 4 Bed FlatFlat 25, Melton Court, Onslow Crescent, London, SW7 3JQFlat 25, Melton Court, Onslow Crescent, London, SW7 3JQ
• Sold Dec 2023£2,841,500 | 3 Bed Flat62, Rose Square, London, SW3 6RS62, Rose Square, London, SW3 6RS
• Sold Jun 2021£3,325,000 | 3 Bed FlatFlat 4, 81, Onslow Square, London, SW7 3LTFlat 4, 81, Onslow Square, London, SW7 3LT
• Sold Apr 2021£2,500,000 | 4 Bed FlatFlat 12, 105, Onslow Square, London, SW7 3LUFlat 12, 105, Onslow Square, London, SW7 3LU
• 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 Mar 2018£5,000,000 | 3 Bed FlatFlat 1, 61, Onslow Square, London, SW7 3LSFlat 1, 61, Onslow Square, London, SW7 3LS
• 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 Oct 2015£3,200,000 | 3 Bed FlatFlat 5, Avenue Studios, Sydney Close, London, SW3 6HWFlat 5, Avenue Studios, Sydney Close, London, SW3 6HW
• Sold Sep 2015£3,850,000 | 3 Bed Flat20, Rose Square, London, SW3 6RS20, Rose Square, London, SW3 6RS
• Sold Mar 2015£4,100,000 | 3 Bed FlatFlat 5, 61, Onslow Square, London, SW7 3LSFlat 5, 61, Onslow Square, London, SW7 3LS
• Sold Dec 2014£3,950,000 | 3 Bed FlatFlat 6, 81, Onslow Square, London, SW7 3LTFlat 6, 81, Onslow Square, London, SW7 3LT
• Sold Jul 2014£1,999,000 | 3 Bed FlatFlat 4, 14, Onslow Square, London, SW7 3NPFlat 4, 14, Onslow Square, London, SW7 3NP
• Sold May 2014£3,900,000 | 3 Bed FlatFlat 3, 38, Onslow Square, London, SW7 3NSFlat 3, 38, Onslow Square, London, SW7 3NS
• Sold Jan 2014£2,861,000 | 4 Bed FlatFlat 12, Melton Court, Onslow Crescent, London, SW7 3JQFlat 12, Melton Court, Onslow Crescent, London, SW7 3JQ
• Sold Feb 2013£2,300,000 | 3 Bed FlatFlat 5, 5, Onslow Square, London, SW7 3NJFlat 5, 5, Onslow Square, London, SW7 3NJ
• Sold Jun 2011£2,750,000 | 4 Bed FlatFlat 62, Melton Court, Onslow Crescent, London, SW7 3JHFlat 62, Melton Court, Onslow Crescent, London, SW7 3JH
• Sold Jan 2011£2,250,000 | 3 Bed FlatFlat 3, 89, Onslow Square, London, SW7 3LTFlat 3, 89, Onslow Square, London, SW7 3LT
• Sold Mar 2007£2,500,000 | 4 Bed FlatFlat 29, Melton Court, Onslow Crescent, London, SW7 3JQFlat 29, Melton Court, Onslow Crescent, London, SW7 3JQ

Of the 321 addresses on Onslow Square, London, SW7, Flat 3, 14, Onslow Square comes out as the 63rd largest and the 83rd most expensive in our analysis of the public data.

It is also £528k more 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.