40, Flask Walk has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 17 Feb 2026.

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

Land Registry records and our Estate Agent network show 25 sales of comparable properties within 300 metres of 40, Flask Walk since 2007.

Most recently, Flat 2, 28, Carlingford Road, London, NW3 1RX, a leasehold flat, sold at £560,000 on the 6th February 2026.

Read more about house prices in NW3.

• Sold Feb 2026£560,000 | 1 Bed FlatFlat 2, 28, Carlingford Road, London, NW3 1RXFlat 2, 28, Carlingford Road, London, NW3 1RX
• Sold Oct 2025£680,000 | 1 Bed FlatFlat 2, 31, Willow Road, London, NW3 1TLFlat 2, 31, Willow Road, London, NW3 1TL
• Sold Jul 2025£740,000 | 1 Bed FlatFlat 3, 31, Willow Road, London, NW3 1TLFlat 3, 31, Willow Road, London, NW3 1TL
• Sold Oct 2024£600,000 | 2 Bed FlatFlat 120, Greenhill, Prince Arthur Road, London, NW3 5TYFlat 120, Greenhill, Prince Arthur Road, London, NW3 5TY
• Sold Oct 2023£522,500 | 2 Bed FlatFlat 9, The Wells House, Well Walk, London, NW3 1LEFlat 9, The Wells House, Well Walk, London, NW3 1LE
• Sold Sep 2023£590,000 | 2 Bed FlatFlat 6, Willow Hall, Willow Road, London, NW3 1TRFlat 6, Willow Hall, Willow Road, London, NW3 1TR
• Sold Aug 2023£550,000 | 2 Bed Flat42A, Gayton Road, London, NW3 1TU42A, Gayton Road, London, NW3 1TU
• Sold Sep 2022£700,000 | 2 Bed Flat41C, Gayton Road, London, NW3 1TU41C, Gayton Road, London, NW3 1TU
• Sold Apr 2022£499,000 | 1 Bed FlatFlat 15, 13-17 , Village Mount, London, NW3 1QUFlat 15, 13-17 , Village Mount, London, NW3 1QU
• Sold Oct 2021£430,000 | 1 Bed FlatFlat 10, New Court, Lutton Terrace, London, NW3 1HDFlat 10, New Court, Lutton Terrace, London, NW3 1HD
• Sold Jan 2021£695,000 | 1 Bed FlatFlat 2, 34, Carlingford Road, London, NW3 1RXFlat 2, 34, Carlingford Road, London, NW3 1RX
• Sold Nov 2019£640,000 | 2 Bed FlatFlat 14, Willow Hall, Willow Road, London, NW3 1TRFlat 14, Willow Hall, Willow Road, London, NW3 1TR
• Sold Mar 2019£537,500 | 2 Bed Flat4, Oriel Court, London, NW3 6TG4, Oriel Court, London, NW3 6TG
• Sold Feb 2018£515,000 | 1 Bed FlatFlat 3, New End House, New End, London, NW3 1HTFlat 3, New End House, New End, London, NW3 1HT
• Sold Sep 2015£525,000 | 1 Bed FlatFlat 3, 15, New End, London, NW3 1JDFlat 3, 15, New End, London, NW3 1JD
• Sold Jun 2013£541,000 | 2 Bed FlatFlat 3, Willow Hall, Willow Road, London, NW3 1TRFlat 3, Willow Hall, Willow Road, London, NW3 1TR
• Sold Jun 2013£436,700 | 1 Bed Flat18A, Gardnor Road, London, NW3 1HA18A, Gardnor Road, London, NW3 1HA
• Sold Dec 2011£442,500 | 2 Bed FlatFlat 13, Willow Hall, Willow Road, London, NW3 1TRFlat 13, Willow Hall, Willow Road, London, NW3 1TR
• Sold Jul 2009£350,000 | 2 Bed Flat26A, Gayton Road, London, NW3 1TY26A, Gayton Road, London, NW3 1TY
• Sold Oct 2007£250,000 | 2 Bed FlatFlat 12, The Wells House, Well Walk, London, NW3 1LEFlat 12, The Wells House, Well Walk, London, NW3 1LE

Our analysis of the public data ranks 40, Flask Walk as the 80th largest and the 76th most expensive of the 81 addresses on Flask Walk, London, NW3.

Against the NW3 postcode district average, it is £695k less expensive than the typical property.

• New End Primary School

  100 m away
• Hampstead Parochial Church of England Primary School

  200 m away
• Christ Church Primary School, Hampstead

  300 m away

• The UCL Academy

  1.7 km away
• William Ellis School

  1.8 km away
• Parliament Hill School

  1.9 km away

• Hampstead

  |

  100 m away
• Hampstead Heath

  |

  800 m away
• Finchley Road & Frognal

  |

  800 m away

Environment Agency data suggests this area has a Very Low risk of flooding.