Over the last 12 months the sale value of Flat D 23 Belsize Avenue has decreased by an estimated £19,097 (1.6%) and its rental value has increased by an estimated £237 per month (6.1%), giving an expected gross yield of 4%.

Flat D, 23, Belsize Avenue has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 26 Aug 2020.

The property is connected to mains gas and has single glazed windows. It is heated using Boiler and radiators, mains gas.

According to the Land Registry and our network of Estate Agents, there have been 3 sales of properties similar to Flat D, 23, Belsize Avenue within a radius of 270 metres over the last 2 years.

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

Read more about house prices in NW3.

• Sold Dec 2025£1,200,000 | 3 Bed FlatRoscommon House 2, Lyndhurst GardensFlat 4, Roscommon House 2, Lyndhurst Gardens, London, NW3 5NP
• Sold Jun 2025£1,150,000 | 3 Bed Flat28, Belsize Park GardensFlat 4, 28, Belsize Park Gardens, London, NW3 4LH
• Sold Mar 2021£1,123,296 | 3 Bed Flat23, Belsize AvenueFlat B, 23, Belsize Avenue, London, NW3 4BL

•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 D, 23, Belsize Avenue is the 115th largest and the 61st most expensive property on the street.

When compared to the postcode district it is £144k less expensive than the average property in NW3.

The nearest school is Rosary Catholic Primary School which is 400 metres away. The nearest train station is Belsize Park which is 400 metres away.

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