Flat B, 20, Belsize Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 17 Nov 2021.

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

According to the Land Registry and our network of Estate Agents, there have been 7 sales of properties similar to Flat B, 20, Belsize Square within a radius of 270 metres since 2009.

The most recent example is Flat 26, Eton Court, Eton Avenue, London, NW3 3HJ, a leasehold flat which sold for £2,200,000 on the 27th February 2026.

Read more about house prices in NW3.

• Sold Feb 2026£2,200,000 | 4 Bed FlatFlat 26, Eton Court, Eton Avenue, London, NW3 3HJFlat 26, Eton Court, Eton Avenue, London, NW3 3HJ
• Sold Nov 2022£2,635,000 | 4 Bed Flat6, Crossfield Road, London, NW3 4NS6, Crossfield Road, London, NW3 4NS
• Sold Aug 2022£2,625,000 | 4 Bed FlatFlat 2, 43, Lancaster Grove, London, NW3 4HBFlat 2, 43, Lancaster Grove, London, NW3 4HB
• Sold Jun 2022£2,450,000 | 4 Bed Flat6B , Belsize Park Gardens, London, NW3 4LD6B , Belsize Park Gardens, London, NW3 4LD
• Sold Apr 2017£1,900,000 | 4 Bed FlatFlat D, 31, Lancaster Grove, London, NW3 4EXFlat D, 31, Lancaster Grove, London, NW3 4EX
• Sold Sep 2016£2,140,000 | 4 Bed FlatFlat 4, 4, Belsize Park, London, NW3 4ETFlat 4, 4, Belsize Park, London, NW3 4ET
• Sold Nov 2009£1,231,000 | 4 Bed FlatFlat 6, 35, Belsize Park Gardens, London, NW3 4JJFlat 6, 35, Belsize Park Gardens, London, NW3 4JJ

Our network of Estate Agents reports 2 lets within 270 metres of Flat B, 20, 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, Flat B, 20, Belsize Square is the 12th largest and the 6th most expensive property on the street.

When compared to the postcode district it is £1.103m more expensive than the average property in NW3.

• 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

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