According to data from HM Land Registry, 19, Flask Walk sits on a plot of 122 m².

We have plot size data on 15 out of 15 other houses in the postcode and 19, Flask Walk sits on the 9th largest plot.

19, Flask Walk has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 06 Oct 2021.

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

According to the Land Registry and our network of Estate Agents, there have been 37 sales of properties similar to 19, Flask Walk within a radius of 300 metres since 2008.

The most recent example is 17, The Mount, London, NW3 6SZ, a freehold house which sold for £2,185,000 on the 23rd December 2025.

Read more about house prices in NW3.

• Sold Dec 2025£2,185,000 | 4 Bed House17, The Mount, London, NW3 6SZ17, The Mount, London, NW3 6SZ
• Sold Nov 2025£1,500,000 | 4 Bed HouseSide Door, 16, Flask Walk, London, NW3 1HESide Door, 16, Flask Walk, London, NW3 1HE
• Sold Oct 2022£1,900,000 | 3 Bed House22, Flask Walk, London, NW3 1HE22, Flask Walk, London, NW3 1HE
• Sold Aug 2022£2,550,000 | 4 Bed House61, New End, London, NW3 1HY61, New End, London, NW3 1HY
• Sold Jul 2022£2,600,000 | 4 Bed House14, The Mount, London, NW3 6SZ14, The Mount, London, NW3 6SZ
• Sold Jun 2022£1,830,000 | 4 Bed House39, Flask Walk, London, NW3 1HH39, Flask Walk, London, NW3 1HH
• Sold Jan 2022£1,675,000 | 4 Bed House9, Benhams Place, London, NW3 6QX9, Benhams Place, London, NW3 6QX
• Sold Sep 2021£2,500,000 | 4 Bed House35, Flask Walk, London, NW3 1HH35, Flask Walk, London, NW3 1HH
• Sold Apr 2021£2,000,000 | 4 Bed House55A, Gayton Road, London, NW3 1TU55A, Gayton Road, London, NW3 1TU
• Sold Jan 2021£1,595,000 | 3 Bed House47, Flask Walk, London, NW3 1HH47, Flask Walk, London, NW3 1HH
• Sold Oct 2020£2,400,000 | 4 Bed House2, The Mount, London, NW3 6SZ2, The Mount, London, NW3 6SZ
• Sold Sep 2020£1,640,000 | 3 Bed House14, Back Lane, London, NW3 1HL14, Back Lane, London, NW3 1HL
• Sold Jul 2020£2,225,000 | 4 Bed House71B, Flask Walk, London, NW3 1ET71B, Flask Walk, London, NW3 1ET
• Sold Feb 2020£1,300,000 | 4 Bed House8, Benhams Place, London, NW3 6QX8, Benhams Place, London, NW3 6QX
• Sold Jun 2018£2,850,000 | 4 Bed House5, Back Lane, London, NW3 1HL5, Back Lane, London, NW3 1HL
• Sold Jul 2015£2,025,000 | 4 Bed House38, New End Square, London, NW3 1LS38, New End Square, London, NW3 1LS
• Sold Jan 2015£1,350,000 | 4 Bed House7, Benhams Place, London, NW3 6QX7, Benhams Place, London, NW3 6QX
• Sold May 2014£1,770,000 | 4 Bed House6, Perrins Court, London, NW3 1QS6, Perrins Court, London, NW3 1QS
• Sold Jan 2011£1,495,000 | 4 Bed House18, Flask Walk, London, NW3 1HE18, Flask Walk, London, NW3 1HE
• Sold Jul 2008£1,830,000 | 4 Bed House27, Flask Walk, London, NW3 1HH27, Flask Walk, London, NW3 1HH

Flask Walk, London, NW3 has a total of 81 addresses. According to our analysis of all the public data, 19, Flask Walk is the 29th largest and the 22nd most expensive property on the street.

When compared to the postcode district it is £802k more expensive than the average property in NW3.

• 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

  1.8 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

  |

  900 m away

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