Our Data Sources
9, Northumberland Avenue, Isleworth has no records in the the Land Registry and a single entry in the EPC database dated September 2024.
We combine this information with public data 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 9, Northumberland Avenue, Isleworth would be worth £875,406, with a potential rental value of £3,136 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £775,359, with a rental value of £2,778 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
9, Northumberland Avenue, Isleworth occupies a 320 m2 plot as recorded by HM Land Registry.
All 5 other houses in this postcode have recorded plot sizes, and this one ranks as the largest.
Energy Efficiency
9, Northumberland Avenue, Isleworth has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 12 Sep 2024.
The property is connected to mains gas and has fully double glazed windows. It is heated using Boiler and radiators, mains gas.
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 122 sales of comparable properties within 470 metres of 9, Northumberland Avenue, Isleworth across the last 2 years.
Most recently, 39, Wood Lane, Isleworth, TW7 5EF, a freehold house, sold at £745,000 on the 24th October 2025.
Read more about house prices in TW7.
- Sold Oct 2025£745,000 | 4 Bed House39, Wood Lane, Isleworth, TW7 5EF39, Wood Lane, Isleworth, TW7 5EF
- Sold Sep 2023£268,000 | 4 Bed House38, Albury Avenue, Isleworth, TW7 5HX38, Albury Avenue, Isleworth, TW7 5HX
- Sold Aug 2022£825,000 | 4 Bed House2, Downs View, Isleworth, TW7 5HF2, Downs View, Isleworth, TW7 5HF
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Similar Properties Let Nearby
Agents in our network have reported 1 letting of a comparable property within 470 metres of 9, Northumberland Avenue, Isleworth across the last 2 years.
The newest of these is 40, Syon Park Gardens, Isleworth, TW7 5NB, a freehold house let by Jorgensen Turner in August 2023.
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
Location Comparison
Our analysis of the public data ranks 9, Northumberland Avenue, Isleworth as the 12th largest and the 15th most expensive of the 46 addresses on Northumberland Avenue, Isleworth, TW7.
Against the TW7 postcode district average, it is £327k more expensive than the typical property.
More reading links
Schools Nearby
- Marlborough Primary School400 m away
- The Smallberry Green Primary School600 m away
- Isleworth Town Primary School700 m away
- The Green School for Girls600 m away
- Isleworth and Syon School for Boys600 m away
- The Green School for Boys700 m away
More reading links
Public Transport Nearby
- Syon Lane|600 m away
- Isleworth|600 m away
- Osterley|1.3 km away
Available Internet Speeds
Ofcom's latest figures show superfast broadband available in this area.
According to recent data from Ofcom, Superfast Broadband is available in the area.
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
