Flat 3, 42, Belsize Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 24 Mar 2026.

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

According to HM Land Registry, Flat 3, 42, Belsize Square was last sold on 7th July 2005 for £305,000 and was recorded as a leasehold flat.

The property has only had this single sale since 1995.

• Sold Jul 2005£305,000

According to the Land Registry and our network of Estate Agents, there have been 60 sales of properties similar to Flat 3, 42, Belsize Square within a radius of 260 metres since 2015.

The most recent example is 25D , Belsize Park Gardens, London, NW3 4JH, a leasehold flat which sold for £880,000 on the 21st February 2025.

Read more about house prices in NW3.

• Sold Feb 2025£880,000 | 2 Bed Flat25D , Belsize Park Gardens, London, NW3 4JH25D , Belsize Park Gardens, London, NW3 4JH
• Sold Nov 2024£1,085,000 | 2 Bed Flat44B, Belsize Park Gardens, London, NW3 4LY44B, Belsize Park Gardens, London, NW3 4LY
• Sold Oct 2024£790,000 | 2 Bed FlatFlat 7, 5, Lambolle Road, London, NW3 4HSFlat 7, 5, Lambolle Road, London, NW3 4HS
• Sold Sep 2024£800,000 | 2 Bed Flat19B, Belsize Park, London, NW3 4DU19B, Belsize Park, London, NW3 4DU
• Sold Aug 2024£885,000 | 2 Bed Flat9B , Belsize Avenue, London, NW3 4BL9B , Belsize Avenue, London, NW3 4BL
• Sold Aug 2024£512,500 | 2 Bed Flat19, Mccrone Mews, London, NW3 5BG19, Mccrone Mews, London, NW3 5BG
• Sold Mar 2024£1,085,000 | 2 Bed FlatFlat 4, 11, Belsize Avenue, London, NW3 4BLFlat 4, 11, Belsize Avenue, London, NW3 4BL
• Sold Oct 2023£780,000 | 2 Bed FlatFlat 2, 5A , Belsize Square, London, NW3 4HTFlat 2, 5A , Belsize Square, London, NW3 4HT
• Sold Oct 2023£721,500 | 2 Bed FlatFlat 4, Claridge House 13, Belsize Park, London, NW3 4ESFlat 4, Claridge House 13, Belsize Park, London, NW3 4ES
• Sold Jul 2023£840,000 | 2 Bed FlatFlat 2, 50, Belsize Square, London, NW3 4HNFlat 2, 50, Belsize Square, London, NW3 4HN
• Sold Jun 2023£935,000 | 2 Bed FlatFlat 9, 28, Belsize Park Gardens, London, NW3 4LHFlat 9, 28, Belsize Park Gardens, London, NW3 4LH
• Sold Apr 2023£800,000 | 2 Bed FlatFlat 1, 11, Belsize Park, London, NW3 4ESFlat 1, 11, Belsize Park, London, NW3 4ES
• Sold Nov 2022£670,000 | 2 Bed Flat18, Mccrone Mews, London, NW3 5BG18, Mccrone Mews, London, NW3 5BG
• Sold Aug 2022£1,240,000 | 2 Bed Flat1 Sussex House , Glenilla Road, London, NW3 4AR1 Sussex House , Glenilla Road, London, NW3 4AR
• Sold May 2022£1,000,000 | 2 Bed FlatFlat 5, 22, Belsize Square, London, NW3 4HTFlat 5, 22, Belsize Square, London, NW3 4HT
• Sold Jun 2021£790,000 | 2 Bed FlatFlat 3, 8, Belsize Park Gardens, London, NW3 4LDFlat 3, 8, Belsize Park Gardens, London, NW3 4LD
• Sold May 2021£685,000 | 2 Bed Flat21, Mccrone Mews, London, NW3 5BG21, Mccrone Mews, London, NW3 5BG
• Sold Aug 2020£755,000 | 2 Bed FlatFlat 6, Claridge House 13, Belsize Park, London, NW3 4ESFlat 6, Claridge House 13, Belsize Park, London, NW3 4ES
• Sold Jan 2020£945,000 | 2 Bed FlatFlat 5, 26, Belsize Park, London, NW3 4DUFlat 5, 26, Belsize Park, London, NW3 4DU
• Sold Sep 2015£862,500 | 2 Bed FlatFlat 7, 28, Belsize Park Gardens, London, NW3 4LHFlat 7, 28, Belsize Park Gardens, London, NW3 4LH

Our network of Estate Agents reports 2 lets of properties similar to Flat 3, 42, Belsize Square within a radius of 260 metres over the last 2 years.

Most recently, 3B , Lancaster Drive, London, NW3 4EY, a leasehold flat, was 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.

Belsize Square, London, NW3 has a total of 264 addresses. According to our analysis of all the public data, Flat 3, 42, Belsize Square is the 158th largest and the 111th most expensive property on the street.

When compared to the postcode district it is £422k less expensive than the average property in NW3.

• 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

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.