18A, Belsize Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 26 Apr 2019.

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

The most recent sale of 18A, Belsize Square completed on 2nd December 2019 at £1,490,000 and was recorded by HM Land Registry as a leasehold flat.

Since 1995 this is the property's only sale.

Values of comparable properties have dropped by 8.5% over the period since December 2019.

• Sold Dec 2019£1,490,000

Since 2019 72 properties similar to 18A, Belsize Square have sold within a radius of 270 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 20th March 2025, was Flat 3, 11, Belsize Park, London, NW3 4ES, a leasehold flat which sold for £1,350,000.

Read more about house prices in NW3.

• 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£1,520,000 | 3 Bed FlatFlat 5, 13, Belsize Park Gardens, London, NW3 4JGFlat 5, 13, Belsize Park Gardens, London, NW3 4JG
• Sold Nov 2024£1,550,000 | 3 Bed Flat19C , Belsize Park, London, NW3 4DU19C , Belsize Park, London, NW3 4DU
• Sold Oct 2024£1,269,537 | 3 Bed Flat46A, Belsize Square, London, NW3 4HN46A, Belsize Square, London, NW3 4HN
• Sold Jul 2024£1,563,290 | 3 Bed FlatFlat 5, 42, Belsize Square, London, NW3 4HNFlat 5, 42, Belsize Square, London, NW3 4HN
• Sold May 2024£1,525,000 | 3 Bed FlatFlat 4, 36, Eton Avenue, London, NW3 3HLFlat 4, 36, Eton Avenue, London, NW3 3HL
• Sold Sep 2023£1,337,000 | 3 Bed FlatFlat 2, 29, Belsize Park Gardens, London, NW3 4JHFlat 2, 29, Belsize Park Gardens, London, NW3 4JH
• Sold Jun 2023£1,700,000 | 4 Bed FlatFlat 4, 16, Belsize Park, London, NW3 4ESFlat 4, 16, Belsize Park, London, NW3 4ES
• Sold Mar 2023£1,680,000 | 3 Bed Flat65B , Belsize Park Gardens, London, NW3 4JN65B , Belsize Park Gardens, London, NW3 4JN
• Sold Sep 2022£1,520,000 | 3 Bed FlatFlat 1, 14, Belsize Park, London, NW3 4ESFlat 1, 14, Belsize Park, London, NW3 4ES
• Sold Feb 2022£1,625,000 | 3 Bed Flat15A, Belsize Square, London, NW3 4HT15A, Belsize Square, London, NW3 4HT
• Sold Jun 2021£345,000 | 3 Bed FlatFlat 5, 38-40 , Eton Avenue, London, NW3 3HLFlat 5, 38-40 , Eton Avenue, London, NW3 3HL
• Sold Jun 2021£1,200,000 | 3 Bed FlatFlat 2, 9, Belsize Square, London, NW3 4HTFlat 2, 9, Belsize Square, London, NW3 4HT
• Sold Jun 2021£1,250,000 | 3 Bed Flat43B, Eton Avenue, London, NW3 3EP43B, Eton Avenue, London, NW3 3EP
• Sold Dec 2020£1,405,000 | 3 Bed Flat37D, Belsize Square, London, NW3 4HL37D, Belsize Square, London, NW3 4HL
• Sold Aug 2020£1,585,000 | 3 Bed Flat14A, Belsize Square, London, NW3 4HT14A, Belsize Square, London, NW3 4HT
• Sold Jun 2020£1,500,000 | 3 Bed FlatFlat 2, 39, Eton Avenue, London, NW3 3EPFlat 2, 39, Eton Avenue, London, NW3 3EP
• Sold Apr 2020£1,464,500 | 3 Bed FlatFlat 1, 9, Belsize Square, London, NW3 4HTFlat 1, 9, Belsize Square, London, NW3 4HT
• Sold Jan 2020£1,175,000 | 3 Bed FlatFlat 2, 17, Buckland Crescent, London, NW3 5DHFlat 2, 17, Buckland Crescent, London, NW3 5DH
• Sold Jun 2019£1,400,000 | 3 Bed FlatFlat 1, 13, Belsize Square, London, NW3 4HTFlat 1, 13, Belsize Square, London, NW3 4HT

Over the past 2 years our Estate Agent network has recorded 2 lets within 270 metres of 18A, Belsize Square.

The latest, in February 2025, was 3B , Lancaster Drive, London, NW3 4EY, a leasehold flat let by Fine Living.

• 
  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.

Of the 264 addresses on Belsize Square, London, NW3, 18A, Belsize Square comes out as the 55th largest and the 40th most expensive in our analysis of the public data.

It is also £61k more expensive than the average property across the NW3 district.

• 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

The flood risk here is rated Very Low, based on Environment Agency data.