Our Data Sources
20, Thornfield Avenue has a single entry in the Land Registry from December 2017 and a single entry in the EPC database dated April 2017.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 1 out of 5 and is considered of low accuracy.
Price Range & Condition
In very good condition, we estimate 20, Thornfield Avenue would be worth £836,006, with a potential rental value of £3,721 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £740,462, with a rental value of £3,296 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
20, Thornfield Avenue occupies a 380 m2 plot as recorded by HM Land Registry.
All 12 other houses in this postcode have recorded plot sizes, and this one ranks as the 3rd largest.
Energy Efficiency
20, Thornfield Avenue has an Energy Performance Rating (EPC) of F. This is based on the most recent assessment, dated 06 Apr 2017.
The property is connected to mains gas and has fully double glazed windows. It is heated using Room heaters, electric.
Sold Prices
20, Thornfield Avenue last changed hands on 11th December 2017, selling for £775,000. The transaction was logged as a freehold house by HM Land Registry.
That is its only recorded sale since 1995.
The market for similar properties has risen by 13.3% since December 2017.
- Sold Dec 2017£775,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 67 sales of comparable properties within 600 metres of 20, Thornfield Avenue across the last 2 years.
Most recently, 171, Holders Hill Road, London, NW7 1ND, a freehold house, sold at £773,000 on the 16th January 2026.
Read more about house prices in NW7.
- Sold Jan 2026£773,000 | 4 Bed House171, Holders Hill Road, London, NW7 1ND171, Holders Hill Road, London, NW7 1ND
- Sold Dec 2024£910,000 | 4 Bed House113, Dollis Road, London, NW7 1JX113, Dollis Road, London, NW7 1JX
- Sold Apr 2023£857,500 | 3 Bed House15, Thornfield Avenue, London, NW7 1LT15, Thornfield Avenue, London, NW7 1LT
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Our analysis of the public data ranks 20, Thornfield Avenue as the 5th largest and the 10th most expensive of the 24 addresses on Thornfield Avenue, London, NW7.
Against the NW7 postcode district average, it is £91k more expensive than the typical property.
More reading links
Schools Nearby
- St Mary's CofE Primary School400 m away
- Millbrook Park Primary School700 m away
- Pardes House Primary School800 m away
- Hasmonean High School for Boys1.0 km away
- Hasmonean High School for Girls1.9 km away
- Copthall School1.9 km away
More reading links
Public Transport Nearby
- Mill Hill East|600 m away
- Finchley Central|1.0 km away
- West Finchley|1.4 km away
Available Internet Speeds
Ofcom's latest figures show ultrafast broadband available in this area.
According to recent data from Ofcom, Ultrafast Broadband is available in the area.
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
