Garden Flat, 23A, Belsize Square has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 24 Jul 2014.

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 49 sales of properties similar to Garden Flat, 23A, Belsize Square within a radius of 270 metres since 2009.

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 Jan 2026£862,500 | 3 Bed Flat27D, Belsize Square, London, NW3 4HU27D, Belsize Square, London, NW3 4HU
• Sold May 2025£1,100,000 | 3 Bed FlatFlat 10, Springfield Court, Eton Avenue, London, NW3 3ERFlat 10, Springfield Court, Eton Avenue, London, NW3 3ER
• Sold Mar 2025£1,125,000 | 3 Bed FlatFlat 1, Jade House 12, Lancaster Grove, London, NW3 4NXFlat 1, Jade House 12, Lancaster Grove, London, NW3 4NX
• Sold Nov 2024£1,090,000 | 3 Bed FlatFlat 5, 8, Belsize Square, London, NW3 4HTFlat 5, 8, Belsize Square, London, NW3 4HT
• Sold Sep 2024£980,000 | 3 Bed FlatFlat 12, Springfield Court, Eton Avenue, London, NW3 3ERFlat 12, Springfield Court, Eton Avenue, London, NW3 3ER
• Sold Mar 2024£950,000 | 3 Bed FlatFlat 6, 6, Strathray Gardens, London, NW3 4NYFlat 6, 6, Strathray Gardens, London, NW3 4NY
• 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 Jul 2022£1,076,150 | 3 Bed FlatFlat 5, 6, Strathray Gardens, London, NW3 4NYFlat 5, 6, Strathray Gardens, London, NW3 4NY
• Sold Jun 2022£900,000 | 3 Bed FlatFlat 10, Jade House 12, Lancaster Grove, London, NW3 4NXFlat 10, Jade House 12, Lancaster Grove, London, NW3 4NX
• Sold Sep 2021£1,180,000 | 3 Bed FlatFlat 1, 23, Belsize Park, London, NW3 4DUFlat 1, 23, Belsize Park, London, NW3 4DU
• Sold Jun 2020£785,000 | 3 Bed Flat24C , Lambolle Road, London, NW3 4HP24C , Lambolle Road, London, NW3 4HP
• Sold Sep 2019£1,100,000 | 3 Bed FlatFlat 3A, Jade House 12, Lancaster Grove, London, NW3 4NXFlat 3A, Jade House 12, Lancaster Grove, London, NW3 4NX
• Sold May 2019£1,160,000 | 3 Bed FlatFlat 1, 47, Belsize Square, London, NW3 4HNFlat 1, 47, Belsize Square, London, NW3 4HN
• Sold Dec 2018£1,280,000 | 3 Bed FlatBasement, 10, Lancaster Drive, London, NW3 4HABasement, 10, Lancaster Drive, London, NW3 4HA
• Sold Mar 2018£1,160,000 | 3 Bed Flat44B , Belsize Square, London, NW3 4HN44B , Belsize Square, London, NW3 4HN
• Sold Oct 2017£1,232,000 | 3 Bed FlatFlat 2, 25, Belsize Park, London, NW3 4DUFlat 2, 25, Belsize Park, London, NW3 4DU
• Sold Apr 2017£1,055,000 | 3 Bed FlatFlat 47, Eton Court, Eton Avenue, London, NW3 3HJFlat 47, Eton Court, Eton Avenue, London, NW3 3HJ
• Sold Sep 2009£800,000 | 3 Bed FlatFlat B, 47, Belsize Square, London, NW3 4HNFlat B, 47, Belsize Square, London, NW3 4HN

Our network of Estate Agents reports 2 lets within 270 metres of Garden Flat, 23A, 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, Garden Flat, 23A, Belsize Square is the 97th largest and the 110th most expensive property on the street.

When compared to the postcode district it is £400k less expensive than the average property in NW3.

• Holy Trinity CofE Primary School, NW3

  600 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

• Belsize Park

  |

  500 m away
• Swiss Cottage

  |

  500 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.