9A, Belsize Avenue has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 03 Mar 2020.

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

Since 2015 72 properties similar to 9A, Belsize Avenue have sold within a radius of 270 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 18th December 2025, was Flat 4, Roscommon House 2, Lyndhurst Gardens, London, NW3 5NP, a leasehold flat which sold for £1,200,000.

Read more about house prices in NW3.

• Sold Dec 2025£1,200,000 | 3 Bed FlatFlat 4, Roscommon House 2, Lyndhurst Gardens, London, NW3 5NPFlat 4, Roscommon House 2, Lyndhurst Gardens, London, NW3 5NP
• Sold Aug 2025£1,050,000 | 3 Bed Flat76, Belsize Lane, London, NW3 5BJ76, Belsize Lane, London, NW3 5BJ
• 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 Nov 2024£1,090,000 | 3 Bed FlatFlat 5, 8, Belsize Square, London, NW3 4HTFlat 5, 8, Belsize Square, London, NW3 4HT
• Sold Jun 2024£1,137,500 | 3 Bed FlatFlat 44, Belsize Court, Wedderburn Road, London, NW3 5QHFlat 44, Belsize Court, Wedderburn Road, London, NW3 5QH
• Sold May 2024£1,075,000 | 3 Bed FlatFlat 3, Belsize Court, Wedderburn Road, London, NW3 5QLFlat 3, Belsize Court, Wedderburn Road, London, NW3 5QL
• Sold Apr 2024£1,325,000 | 3 Bed FlatFlat 33, Belsize Court, Wedderburn Road, London, NW3 5QNFlat 33, Belsize Court, Wedderburn Road, London, NW3 5QN
• Sold Feb 2024£1,090,000 | 3 Bed FlatFlat 1B, Wedderburn House 1, Wedderburn Road, London, NW3 5QRFlat 1B, Wedderburn House 1, Wedderburn Road, London, NW3 5QR
• Sold Dec 2023£1,312,500 | 3 Bed FlatFlat 48, Belsize Court, Wedderburn Road, London, NW3 5QHFlat 48, Belsize Court, Wedderburn Road, London, NW3 5QH
• Sold Apr 2023£1,135,000 | 3 Bed FlatFlat 7, Roscommon House 2, Lyndhurst Gardens, London, NW3 5NPFlat 7, Roscommon House 2, Lyndhurst Gardens, London, NW3 5NP
• Sold Feb 2023£1,200,000 | 3 Bed FlatFlat 5, Belsize Court, Wedderburn Road, London, NW3 5QLFlat 5, Belsize Court, Wedderburn Road, London, NW3 5QL
• Sold Jan 2023£1,420,000 | 3 Bed Flat25C , Belsize Avenue, London, NW3 4BL25C , Belsize Avenue, London, NW3 4BL
• Sold Oct 2022£1,250,000 | 3 Bed FlatFlat 7, Belsize Court, Wedderburn Road, London, NW3 5QLFlat 7, Belsize Court, Wedderburn Road, London, NW3 5QL
• Sold Aug 2022£1,510,000 | 3 Bed FlatFlat 1, 26, Belsize Avenue, London, NW3 4AUFlat 1, 26, Belsize Avenue, London, NW3 4AU
• Sold Mar 2021£1,123,296 | 3 Bed FlatFlat B, 23, Belsize Avenue, London, NW3 4BLFlat B, 23, Belsize Avenue, London, NW3 4BL
• Sold Mar 2021£1,280,000 | 3 Bed FlatFlat 2, 20, Belsize Park Gardens, London, NW3 4LHFlat 2, 20, Belsize Park Gardens, London, NW3 4LH
• Sold Nov 2019£1,286,710 | 3 Bed Flat54C , Glenloch Road, London, NW3 4DL54C , Glenloch Road, London, NW3 4DL
• Sold Sep 2015£1,295,000 | 3 Bed FlatFlat 2, 28, Belsize Park Gardens, London, NW3 4LHFlat 2, 28, Belsize Park Gardens, London, NW3 4LH
• Sold May 2015£1,230,500 | 3 Bed Flat43A, Belsize Square, London, NW3 4HN43A, Belsize Square, London, NW3 4HN

Of the 446 addresses on Belsize Avenue, London, NW3, 9A, Belsize Avenue comes out as the 134th largest and the 69th most expensive in our analysis of the public data.

It is also £185k less expensive than the average property across the NW3 district.

• Rosary Catholic Primary School

  400 m away
• Fitzjohn's Primary School

  600 m away
• Holy Trinity CofE Primary School, NW3

  600 m away

• The UCL Academy

  900 m away
• Haverstock School

  1.3 km away
• Harris Academy St John's Wood

  1.4 km away

• Belsize Park

  |

  400 m away
• Finchley Road

  |

  700 m away
• Hampstead Heath

  |

  700 m away

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