Flat 3, 6, Belsize Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 21 Feb 2020.

The property is connected to mains gas and has some double glazing. It is heated using a boiler and radiators (mains gas).

Flat 3, 6, Belsize Square last changed hands on 29th May 2003, selling for £238,000. The transaction was logged as a leasehold flat by HM Land Registry.

In total it has sold twice since 1995.

• Sold May 2003£238,000
• Sold Apr 1999£148,000

Land Registry records and our Estate Agent network show 39 sales of comparable properties within 270 metres of Flat 3, 6, Belsize Square since 2013.

Most recently, Flat 2, 22, Belsize Avenue, London, NW3 4AU, a leasehold flat, sold at £545,000 on the 5th December 2025.

Read more about house prices in NW3.

• Sold Dec 2025£545,000 | 1 Bed FlatFlat 2, 22, Belsize Avenue, London, NW3 4AUFlat 2, 22, Belsize Avenue, London, NW3 4AU
• Sold Sep 2023£617,500 | 1 Bed FlatFlat D, 10, Belsize Square, London, NW3 4HTFlat D, 10, Belsize Square, London, NW3 4HT
• Sold Jul 2023£525,000 | 1 Bed FlatFlat 5, 5, Belsize Avenue, London, NW3 4BLFlat 5, 5, Belsize Avenue, London, NW3 4BL
• Sold Mar 2023£650,000 | 2 Bed FlatFlat 2, 5, Lambolle Road, London, NW3 4HSFlat 2, 5, Lambolle Road, London, NW3 4HS
• Sold Nov 2022£530,000 | 1 Bed FlatFlat 4, 26, Belsize Avenue, London, NW3 4AUFlat 4, 26, Belsize Avenue, London, NW3 4AU
• Sold Sep 2022£615,000 | 1 Bed FlatFlat 3, Claridge House 13, Belsize Park, London, NW3 4ESFlat 3, Claridge House 13, Belsize Park, London, NW3 4ES
• Sold Sep 2022£455,000 | 1 Bed FlatFlat 4, 47, Belsize Park, London, NW3 4EEFlat 4, 47, Belsize Park, London, NW3 4EE
• Sold Mar 2022£519,000 | 1 Bed Flat4E , Belsize Square, London, NW3 4HT4E , Belsize Square, London, NW3 4HT
• Sold Jun 2021£525,000 | 2 Bed Flat14, Mccrone Mews, London, NW3 5BG14, Mccrone Mews, London, NW3 5BG
• Sold Jun 2021£535,000 | 1 Bed FlatFlat 7, 5, Belsize Avenue, London, NW3 4BLFlat 7, 5, Belsize Avenue, London, NW3 4BL
• Sold Apr 2021£525,000 | 1 Bed Flat17, Mccrone Mews, London, NW3 5BG17, Mccrone Mews, London, NW3 5BG
• Sold Feb 2021£515,000 | 1 Bed Flat16D , Belsize Square, London, NW3 4HT16D , Belsize Square, London, NW3 4HT
• Sold Jan 2021£525,000 | 1 Bed Flat41D, Belsize Square, London, NW3 4HN41D, Belsize Square, London, NW3 4HN
• Sold Jan 2021£560,000 | 1 Bed FlatFlat 7, 31, Adamson Road, London, NW3 3HTFlat 7, 31, Adamson Road, London, NW3 3HT
• Sold Dec 2019£490,000 | 1 Bed FlatFlat 6, 5, Belsize Avenue, London, NW3 4BLFlat 6, 5, Belsize Avenue, London, NW3 4BL
• Sold May 2018£630,000 | 1 Bed FlatFlat 3, 13, Belsize Park Gardens, London, NW3 4JGFlat 3, 13, Belsize Park Gardens, London, NW3 4JG
• Sold Mar 2016£602,500 | 1 Bed Flat16G , Belsize Square, London, NW3 4HT16G , Belsize Square, London, NW3 4HT
• Sold Feb 2016£659,000 | 1 Bed Flat41C, Belsize Square, London, NW3 4HN41C, Belsize Square, London, NW3 4HN
• Sold Dec 2013£625,000 | 1 Bed FlatFlat E, 10, Belsize Square, London, NW3 4HTFlat E, 10, Belsize Square, London, NW3 4HT
• Sold Jun 2013£360,000 | 1 Bed FlatFlat 4, 5, Belsize Avenue, London, NW3 4BLFlat 4, 5, Belsize Avenue, London, NW3 4BL

Agents in our network have reported 2 lettings within 270 metres of Flat 3, 6, Belsize Square across the last 2 years.

The newest of these is 3B , Lancaster Drive, London, NW3 4EY, a leasehold flat let by Fine Living in February 2025.

• 
  Let agreed Feb 2025£ Undisclosed | 2 Bed Flat3B , Lancaster Drive, London, NW3 4EY3B , Lancaster Drive, London, NW3 4EY
• 
  Let agreed Mar 2024£ Undisclosed | 1 Bed Flat3A , Lancaster Drive, London, NW3 4EY3A , Lancaster Drive, London, NW3 4EY

•Nearby is defined as the radius comprising the nearest 2,000 addresses.

Our analysis of the public data ranks Flat 3, 6, Belsize Square as the 220th largest and the 212th most expensive of the 264 addresses on Belsize Square, London, NW3.

Against the NW3 postcode district average, it is £740k less expensive than the typical property.

• Holy Trinity CofE Primary School, NW3

  500 m away
• Rosary Catholic Primary School

  600 m away
• St Paul's Church of England Primary School

  800 m away

• The UCL Academy

  600 m away
• Harris Academy St John's Wood

  1.1 km away
• Haverstock School

  1.2 km away

• Swiss Cottage

  |

  500 m away
• Belsize Park

  |

  600 m away
• Finchley Road

  |

  600 m away

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