Our Data Sources
Flat 4, 21, Siddons Lane has 31 entries in the Land Registry , most recently in March 2026 and a single entry in the EPC database dated September 2025.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 2 out of 5 and is considered of medium accuracy.
Price Range & Condition
The condition of a property plays an important role in determining its value, with the degree of impact varying by property type, size and location.
For Flat 4, 21, Siddons Lane, we estimate a market value of £881,103 and a rental value of £4,383 per month when presented in very good decorative order. Should the property require extensive cosmetic improvement, those figures would reduce to £780,405 and £3,882 per month respectively.
Energy Efficiency
Flat 4, 21, Siddons Lane has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 02 Sep 2025.
The property is connected to mains gas and has fully double glazed windows. It is heated using Boiler and radiators, mains gas.
Sold Prices
The most recent sale of Flat 4, 21, Siddons Lane completed on 31st March 2026 at £820,000 and was recorded by HM Land Registry as a leasehold flat.
Since 1995 the property has sold 3 times.
Values of comparable properties have dropped by 18.6% over the period since March 2026.
- Sold Mar 2026£820,000
- Sold Sep 1998£210,000
- Sold Feb 1995£145,500
Similar Properties Sold Nearby
Over the past 2 years 3 properties similar to Flat 4, 21, Siddons Lane have sold within a radius of 220 metres, per the Land Registry and our network of Estate Agents.
The latest, on the 4th April 2025, was Flat 105, Clarence Gate Gardens, Glentworth Street, London, NW1 6QP, a leasehold flat which sold for £995,000.
Read more about house prices in NW1.
- Sold Apr 2025£995,000 | 2 Bed FlatFlat 105, Clarence Gate Gardens, Glentworth Street, London, NW1 6QPFlat 105, Clarence Gate Gardens, Glentworth Street, London, NW1 6QP
- Sold Nov 2024£800,000 | 2 Bed FlatFlat 165, Clarence Gate Gardens, Glentworth Street, London, NW1 6APFlat 165, Clarence Gate Gardens, Glentworth Street, London, NW1 6AP
- Sold Mar 2024£1,499,999 | 3 Bed FlatFlat 58, Clarence Gate Gardens, Glentworth Street, London, NW1 6QSFlat 58, Clarence Gate Gardens, Glentworth Street, London, NW1 6QS
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Of the 45 addresses on Siddons Lane, London, NW1, Flat 4, 21, Siddons Lane comes out as the 4th largest and the 2nd most expensive in our analysis of the public data.
It is also £16k more expensive than the average property across the NW1 district.
More reading links
Schools Nearby
- 500mSt Edward's Catholic Primary School
- 500mSt Mary's Bryanston Square CofE School
- 600mChrist Church Bentinck CofE Primary School
- 500mThe St Marylebone CofE School
- 1.4kmMarylebone Boys' School
- 2.0kmMaria Fidelis Catholic School FCJ
More reading links
Public Transport Nearby
- 200mBaker Street
- 300mLondon Marylebone
- 300mMarylebone
Risk of Flooding
The flood risk here is rated very low, based on Environment Agency data.
