43A, Belsize Square has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 14 Mar 2014.

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

According to HM Land Registry, 43A, Belsize Square was last sold on 27th May 2015 for £1,230,500 and was recorded as a leasehold flat.

The property has only had this single sale since 1995.

Since May 2015, the market for similar properties has dropped by 16.5%.

• Sold May 2015£1,230,500

According to the Land Registry and our network of Estate Agents, there have been 57 sales of properties similar to 43A, Belsize Square within a radius of 260 metres since 2018.

The most recent example is Flat E, 19, Belsize Park Gardens, London, NW3 4JG, a leasehold flat which sold for £1,325,000 on the 4th February 2026.

Read more about house prices in NW3.

• Sold Feb 2026£1,325,000 | 3 Bed FlatFlat E, 19, Belsize Park Gardens, London, NW3 4JGFlat E, 19, Belsize Park Gardens, London, NW3 4JG
• Sold Aug 2025£1,050,000 | 3 Bed Flat76, Belsize Lane, London, NW3 5BJ76, Belsize Lane, London, NW3 5BJ
• Sold Aug 2025£1,040,000 | 3 Bed Flat44A, Belsize Square, London, NW3 4HN44A, Belsize Square, London, NW3 4HN
• Sold Jul 2025£1,177,000 | 3 Bed FlatFlat 3, 4, Belsize Park, London, NW3 4ETFlat 3, 4, Belsize Park, London, NW3 4ET
• Sold Jun 2025£1,150,000 | 3 Bed FlatFlat 4, 28, Belsize Park Gardens, London, NW3 4LHFlat 4, 28, Belsize Park Gardens, London, NW3 4LH
• Sold Mar 2025£1,350,000 | 3 Bed FlatFlat 3, 11, Belsize Park, London, NW3 4ESFlat 3, 11, Belsize Park, London, NW3 4ES
• Sold Jan 2025£1,250,000 | 3 Bed Flat43D , Belsize Square, London, NW3 4HN43D , Belsize Square, London, NW3 4HN
• Sold Dec 2024£950,000 | 3 Bed FlatFlat 4, 37, Lancaster Grove, London, NW3 4HBFlat 4, 37, Lancaster Grove, London, NW3 4HB
• Sold Oct 2024£1,269,537 | 3 Bed Flat46A, Belsize Square, London, NW3 4HN46A, Belsize Square, London, NW3 4HN
• Sold Jul 2024£1,325,000 | 3 Bed FlatFlat 4, 3, Buckland Crescent, London, NW3 5DHFlat 4, 3, Buckland Crescent, London, NW3 5DH
• Sold Jan 2024£1,270,000 | 3 Bed FlatFlat 2, 6, Lancaster Drive, London, NW3 4HAFlat 2, 6, Lancaster Drive, London, NW3 4HA
• Sold Dec 2023£865,000 | 3 Bed Flat1A, Lancaster Drive, London, NW3 4EY1A, Lancaster Drive, London, NW3 4EY
• Sold Jan 2023£1,420,000 | 3 Bed Flat25C , Belsize Avenue, London, NW3 4BL25C , Belsize Avenue, London, NW3 4BL
• Sold Aug 2022£1,330,000 | 3 Bed FlatFlat 4, 22, Belsize Square, London, NW3 4HTFlat 4, 22, Belsize Square, London, NW3 4HT
• Sold Aug 2022£1,510,000 | 3 Bed FlatFlat 1, 26, Belsize Avenue, London, NW3 4AUFlat 1, 26, Belsize Avenue, London, NW3 4AU
• Sold Feb 2022£1,600,000 | 3 Bed Flat6, Belsize Park Gardens, London, NW3 4LD6, Belsize Park Gardens, London, NW3 4LD
• Sold Jun 2021£1,200,000 | 3 Bed FlatFlat 2, 9, Belsize Square, London, NW3 4HTFlat 2, 9, Belsize Square, London, NW3 4HT
• Sold Nov 2018£1,200,000 | 3 Bed Flat7B , Belsize Park Gardens, London, NW3 4LB7B , Belsize Park Gardens, London, NW3 4LB
• Sold Jul 2018£1,550,000 | 3 Bed Flat18D , Belsize Park, London, NW3 4DU18D , Belsize Park, London, NW3 4DU
• Sold Mar 2018£1,160,000 | 3 Bed Flat44B , Belsize Square, London, NW3 4HN44B , Belsize Square, London, NW3 4HN

Our network of Estate Agents reports 2 lets within 260 metres of 43A, Belsize Square 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, 43A, Belsize Square is the 70th largest and the 61st most expensive property on the street.

When compared to the postcode district it is £181k 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.