According to data from HM Land Registry, 21, Grassmount sits on a plot of 112 m².

We have plot size data on 29 out of 29 other houses in the postcode and 21, Grassmount sits on the 26th largest plot.

21, Grassmount has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 29 Apr 2019.

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

According to HM Land Registry, 21, Grassmount was last sold on 29th November 2001 for £212,000 and was recorded as a freehold house.

The property has had 2 sales since 1995.

According to the Land Registry and our network of Estate Agents, there have been 108 sales of properties similar to 21, Grassmount within a radius of 410 metres since 2017.

The most recent example is 11, Cadley Terrace, London, SE23 3YJ, a freehold house which sold for £750,000 on the 16th February 2026.

Read more about house prices in SE23.

• Sold Feb 2026£750,000 | 3 Bed House11, Cadley Terrace, London, SE23 3YJ11, Cadley Terrace, London, SE23 3YJ
• Sold Sep 2025£799,950 | 4 Bed House13, Little Brownings, London, SE23 3XJ13, Little Brownings, London, SE23 3XJ
• Sold Sep 2024£755,000 | 3 Bed House5, Grassmount, London, SE23 3UW5, Grassmount, London, SE23 3UW
• Sold Jun 2024£896,000 | 4 Bed House7, Grassmount, London, SE23 3UW7, Grassmount, London, SE23 3UW
• Sold Jun 2024£815,000 | 3 Bed House24, Little Brownings, London, SE23 3XJ24, Little Brownings, London, SE23 3XJ
• Sold Feb 2023£825,000 | 4 Bed House16, Grassmount, London, SE23 3UW16, Grassmount, London, SE23 3UW
• Sold Oct 2022£875,000 | 4 Bed House9, Grassmount, London, SE23 3UW9, Grassmount, London, SE23 3UW
• Sold Aug 2022£826,500 | 3 Bed House9, Forestholme Close, London, SE23 3UQ9, Forestholme Close, London, SE23 3UQ
• Sold Jul 2022£825,000 | 4 Bed House24, Grassmount, London, SE23 3UW24, Grassmount, London, SE23 3UW
• Sold Jan 2022£730,000 | 4 Bed House21, Forestholme Close, London, SE23 3UQ21, Forestholme Close, London, SE23 3UQ
• Sold Sep 2021£360,000 | 4 Bed House12, Tarleton Gardens, London, SE23 3XN12, Tarleton Gardens, London, SE23 3XN
• Sold Sep 2021£740,000 | 4 Bed House31, Grassmount, London, SE23 3UW31, Grassmount, London, SE23 3UW
• Sold Aug 2021£773,200 | 4 Bed House16, Little Brownings, London, SE23 3XJ16, Little Brownings, London, SE23 3XJ
• Sold Apr 2021£675,000 | 4 Bed House7, Forestholme Close, London, SE23 3UQ7, Forestholme Close, London, SE23 3UQ
• Sold Nov 2020£738,000 | 4 Bed House14, Little Brownings, London, SE23 3XJ14, Little Brownings, London, SE23 3XJ
• Sold Apr 2019£760,000 | 4 Bed House10, Grassmount, London, SE23 3UW10, Grassmount, London, SE23 3UW
• Sold May 2018£640,000 | 3 Bed House11, Forestholme Close, London, SE23 3UQ11, Forestholme Close, London, SE23 3UQ
• Sold Aug 2017£685,000 | 4 Bed House3, Forestholme Close, London, SE23 3UQ3, Forestholme Close, London, SE23 3UQ
• Sold Aug 2017£810,000 | 4 Bed House18, Grassmount, London, SE23 3UW18, Grassmount, London, SE23 3UW
• Sold Jan 2017£615,000 | 4 Bed House24, Forestholme Close, London, SE23 3UQ24, Forestholme Close, London, SE23 3UQ

Grassmount, London, SE23 has a total of 31 addresses. According to our analysis of all the public data, 21, Grassmount is the 19th largest and the 19th most expensive property on the street.

When compared to the postcode district it is £247k more expensive than the average property in SE23.

• Eliot Bank Primary School

  200 m away
• Holy Trinity Church of England Primary School

  400 m away
• Horniman Primary School

  500 m away

• Sydenham School

  500 m away
• Forest Hill School

  1.1 km away
• Kingsdale Foundation School

  1.9 km away

• Forest Hill

  |

  500 m away
• Sydenham

  |

  1.3 km away
• Sydenham (London)

  |

  1.4 km away

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