Flat 4, 42, Belsize Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 23 Feb 2011.

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

Flat 4, 42, Belsize Square last changed hands on 5th June 2015, selling for £700,000. The transaction was logged as a leasehold flat by HM Land Registry.

In total it has sold 5 times since 1995.

The market for similar properties has dropped by 18.0% since June 2015.

• Sold Jun 2015£700,000
• Sold Apr 2011£420,000
• Sold May 2005£279,000

Land Registry records and our Estate Agent network show 50 sales of comparable properties within 260 metres of Flat 4, 42, Belsize Square since 2015.

Most recently, 18E , Belsize Park, London, NW3 4DU, a leasehold flat, sold at £725,000 on the 4th July 2025.

Read more about house prices in NW3.

• Sold Jul 2025£725,000 | 2 Bed Flat18E , Belsize Park, London, NW3 4DU18E , Belsize Park, London, NW3 4DU
• Sold Jul 2025£845,000 | 2 Bed Flat25G , Belsize Park Gardens, London, NW3 4JH25G , Belsize Park Gardens, London, NW3 4JH
• Sold Mar 2025£475,000 | 2 Bed FlatFlat 3, 28, Belsize Park Gardens, London, NW3 4LHFlat 3, 28, Belsize Park Gardens, London, NW3 4LH
• Sold Nov 2024£625,000 | 2 Bed Flat23F , Belsize Park Gardens, London, NW3 4JH23F , Belsize Park Gardens, London, NW3 4JH
• Sold Nov 2024£675,000 | 2 Bed FlatFlat 6, 42, Belsize Park Gardens, London, NW3 4LYFlat 6, 42, Belsize Park Gardens, London, NW3 4LY
• Sold Sep 2024£625,000 | 2 Bed Flat19A, Belsize Park, London, NW3 4DU19A, Belsize Park, London, NW3 4DU
• Sold May 2024£650,000 | 2 Bed Flat22, Mccrone Mews, London, NW3 5BG22, Mccrone Mews, London, NW3 5BG
• Sold Sep 2023£780,000 | 2 Bed FlatFlat 5, 28, Belsize Park Gardens, London, NW3 4LHFlat 5, 28, Belsize Park Gardens, London, NW3 4LH
• Sold Jun 2023£745,000 | 2 Bed FlatFlat 4, 14, Belsize Park, London, NW3 4ESFlat 4, 14, Belsize Park, London, NW3 4ES
• Sold Mar 2023£508,000 | 2 Bed FlatFlat 27, 35-36, Belsize Square, London, NW3 4HLFlat 27, 35-36, Belsize Square, London, NW3 4HL
• Sold Jan 2023£675,000 | 2 Bed FlatFlat 5, 11, Belsize Park, London, NW3 4ESFlat 5, 11, Belsize Park, London, NW3 4ES
• Sold Dec 2022£675,000 | 2 Bed FlatFlat 6, 43, Lancaster Grove, London, NW3 4HBFlat 6, 43, Lancaster Grove, London, NW3 4HB
• Sold Jun 2022£560,000 | 2 Bed FlatFlat 2, 5, Belsize Avenue, London, NW3 4BLFlat 2, 5, Belsize Avenue, London, NW3 4BL
• Sold Jun 2021£1,175,000 | 2 Bed FlatFlat 4, 39, Belsize Square, London, NW3 4HLFlat 4, 39, Belsize Square, London, NW3 4HL
• Sold Jun 2021£525,000 | 2 Bed Flat12, Mccrone Mews, London, NW3 5BG12, Mccrone Mews, London, NW3 5BG
• Sold Jun 2021£525,000 | 2 Bed Flat14, Mccrone Mews, London, NW3 5BG14, Mccrone Mews, London, NW3 5BG
• Sold Feb 2020£620,000 | 2 Bed Flat7E , Belsize Park Gardens, London, NW3 4LB7E , Belsize Park Gardens, London, NW3 4LB
• Sold Aug 2018£635,000 | 2 Bed FlatFlat 10, 27, Belsize Park, London, NW3 4DUFlat 10, 27, Belsize Park, London, NW3 4DU
• Sold Nov 2017£960,000 | 2 Bed FlatFlat 3, 24, Belsize Park, London, NW3 4DUFlat 3, 24, Belsize Park, London, NW3 4DU
• Sold Jul 2015£649,999 | 2 Bed FlatFlat 1, 28, Belsize Park Gardens, London, NW3 4LHFlat 1, 28, Belsize Park Gardens, London, NW3 4LH

Agents in our network have reported 2 lettings within 260 metres of Flat 4, 42, 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 4, 42, Belsize Square as the 187th largest and the 144th most expensive of the 264 addresses on Belsize Square, London, NW3.

Against the NW3 postcode district average, it is £610k less expensive than the typical property.

• Rosary Catholic Primary School

  500 m away
• Holy Trinity CofE Primary School, NW3

  600 m away
• Fitzjohn's Primary School

  700 m away

• The UCL Academy

  700 m away
• Harris Academy St John's Wood

  1.2 km away
• Haverstock School

  1.2 km away

• Belsize Park

  |

  500 m away
• Swiss Cottage

  |

  600 m away
• Finchley Road

  |

  700 m away

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