Flat 3, 21, Frognal has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 16 Jun 2026.

The property is not connected to mains gas and has fully double glazed windows. It is heated using room heaters (electric).

Flat 3, 21, Frognal last changed hands on 5th June 2015, selling for £395,000. The transaction was logged as a leasehold flat by HM Land Registry.

In total it has sold 3 times since 1995.

The market for similar properties has dropped by 3.5% since June 2015.

Land Registry records and our Estate Agent network show 10 sales of comparable properties within 330 metres of Flat 3, 21, Frognal since 2013.

Most recently, Flat 8, 28, Frognal, London, NW3 6AG, a leasehold flat, sold at £320,000 on the 8th December 2025.

Read more about house prices in NW3.

• Sold Dec 2025£320,000 | 1 Bed FlatFlat 8, 28, Frognal, London, NW3 6AGFlat 8, 28, Frognal, London, NW3 6AG
• Sold Aug 2025£341,000 | 1 Bed FlatFlat 8, 19, Frognal, London, NW3 6ARFlat 8, 19, Frognal, London, NW3 6AR
• Sold Aug 2023£467,500 | 1 Bed FlatFlat 5, Fitzjohns Mansions 10, Netherhall Gardens, London, NW3 5RSFlat 5, Fitzjohns Mansions 10, Netherhall Gardens, London, NW3 5RS
• Sold Jan 2022£420,000 | 1 Bed FlatFlat 1, 21, Frognal, London, NW3 6ARFlat 1, 21, Frognal, London, NW3 6AR
• Sold Sep 2020£318,000 | 1 Bed Flat13C , Lithos Road, London, NW3 6DX13C , Lithos Road, London, NW3 6DX
• Sold Mar 2016£515,000 | 1 Bed FlatFlat 7, Fitzjohns Mansions 10, Netherhall Gardens, London, NW3 5RSFlat 7, Fitzjohns Mansions 10, Netherhall Gardens, London, NW3 5RS
• Sold Feb 2016£450,000 | 1 Bed Flat28A, Rosemont Road, London, NW3 6NE28A, Rosemont Road, London, NW3 6NE
• Sold Jun 2015£445,000 | 1 Bed FlatFlat 7, 16, Frognal, London, NW3 6AGFlat 7, 16, Frognal, London, NW3 6AG
• Sold May 2015£425,000 | 1 Bed FlatFlat 9, 19, Frognal, London, NW3 6ARFlat 9, 19, Frognal, London, NW3 6AR
• Sold Dec 2013£399,995 | 1 Bed FlatFlat 6, 19, Frognal, London, NW3 6ARFlat 6, 19, Frognal, London, NW3 6AR

Our analysis of the public data ranks Flat 3, 21, Frognal as the 344th largest and the 349th most expensive of the 386 addresses on Frognal, London, NW3.

Against the NW3 postcode district average, it is £950k less expensive than the typical property.

• Fitzjohn's Primary School

  400 m away
• Holy Trinity CofE Primary School, NW3

  600 m away
• Hampstead Parochial Church of England Primary School

  600 m away

• The UCL Academy

  1.2 km away
• Harris Academy St John's Wood

  1.5 km away
• Hampstead School

  1.9 km away

• Finchley Road & Frognal

  |

  200 m away
• Finchley Road

  |

  500 m away
• Hampstead

  |

  600 m away

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