Flat 4, 3, Belsize Avenue has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 31 Jul 2021.

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, Flat 4, 3, Belsize Avenue was last sold on 17th December 2003 for £278,000 and was recorded as a leasehold flat.

The property has had 4 sales since 1995.

• Sold Dec 2003£278,000
• Sold May 2001£210,000
• Sold Jun 1998£143,000

According to the Land Registry and our network of Estate Agents, there have been 46 sales of properties similar to Flat 4, 3, Belsize Avenue within a radius of 270 metres since 2017.

The most recent example is Flat 2, 22, Belsize Avenue, London, NW3 4AU, a leasehold flat which sold for £545,000 on the 5th December 2025.

Read more about house prices in NW3.

• Sold Dec 2025£545,000 | 1 Bed FlatFlat 2, 22, Belsize Avenue, London, NW3 4AUFlat 2, 22, Belsize Avenue, London, NW3 4AU
• Sold Mar 2025£550,000 | 2 Bed FlatFlat 3, 21, Belsize Avenue, London, NW3 4BLFlat 3, 21, Belsize Avenue, London, NW3 4BL
• Sold Feb 2025£580,000 | 2 Bed FlatFlat 3, 49, Belsize Avenue, London, NW3 4BNFlat 3, 49, Belsize Avenue, London, NW3 4BN
• Sold Sep 2024£625,000 | 2 Bed Flat19A, Belsize Park, London, NW3 4DU19A, Belsize Park, London, NW3 4DU
• Sold May 2024£650,000 | 2 Bed Flat22, Mccrone Mews, London, NW3 5BG22, Mccrone Mews, London, NW3 5BG
• Sold Sep 2023£780,000 | 2 Bed FlatFlat 5, 28, Belsize Park Gardens, London, NW3 4LHFlat 5, 28, Belsize Park Gardens, London, NW3 4LH
• Sold Sep 2023£617,500 | 1 Bed FlatFlat D, 10, Belsize Square, London, NW3 4HTFlat D, 10, Belsize Square, London, NW3 4HT
• Sold Jun 2023£745,000 | 2 Bed FlatFlat 4, 14, Belsize Park, London, NW3 4ESFlat 4, 14, Belsize Park, London, NW3 4ES
• Sold Mar 2023£508,000 | 2 Bed FlatFlat 27, 35-36, Belsize Square, London, NW3 4HLFlat 27, 35-36, Belsize Square, London, NW3 4HL
• Sold Jan 2023£675,000 | 2 Bed FlatFlat 5, 11, Belsize Park, London, NW3 4ESFlat 5, 11, Belsize Park, London, NW3 4ES
• Sold Aug 2022£725,000 | 2 Bed FlatFlat 5, 10, Belsize Crescent, London, NW3 5QUFlat 5, 10, Belsize Crescent, London, NW3 5QU
• Sold Jun 2022£560,000 | 2 Bed FlatFlat 2, 5, Belsize Avenue, London, NW3 4BLFlat 2, 5, Belsize Avenue, London, NW3 4BL
• Sold Jun 2022£553,000 | 2 Bed Flat16, Mccrone Mews, London, NW3 5BG16, Mccrone Mews, London, NW3 5BG
• Sold Jun 2021£525,000 | 2 Bed Flat12, Mccrone Mews, London, NW3 5BG12, Mccrone Mews, London, NW3 5BG
• Sold Jun 2021£535,000 | 1 Bed FlatFlat 7, 5, Belsize Avenue, London, NW3 4BLFlat 7, 5, Belsize Avenue, London, NW3 4BL
• Sold Jun 2021£525,000 | 2 Bed Flat14, Mccrone Mews, London, NW3 5BG14, Mccrone Mews, London, NW3 5BG
• Sold Apr 2021£525,000 | 1 Bed Flat17, Mccrone Mews, London, NW3 5BG17, Mccrone Mews, London, NW3 5BG
• Sold Apr 2019£640,000 | 1 Bed FlatFirst Floor Flat, 8, Belsize Crescent, London, NW3 5QUFirst Floor Flat, 8, Belsize Crescent, London, NW3 5QU
• Sold Aug 2018£635,000 | 2 Bed FlatFlat 10, 27, Belsize Park, London, NW3 4DUFlat 10, 27, Belsize Park, London, NW3 4DU
• Sold Aug 2017£680,000 | 2 Bed FlatFlat 4, 26, Belsize Park, London, NW3 4DUFlat 4, 26, Belsize Park, London, NW3 4DU

Our network of Estate Agents reports 2 lets within 270 metres of Flat 4, 3, Belsize Avenue 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 Avenue, London, NW3 has a total of 446 addresses. According to our analysis of all the public data, Flat 4, 3, Belsize Avenue is the 311th largest and the 242nd most expensive property on the street.

When compared to the postcode district it is £710k less expensive than the average property in NW3.

• 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

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