Land by postcode · TW area · Isleworth
Isleworth covers the TW7 postcode district, in Greater London. Planning applications here are decided by the Hounslow planning authority. Below: what homes sold for, which planning controls apply, and what that means before you sell or develop a plot in Isleworth.
Residential sales recorded by HM Land Registry between 2024-08 and 2026-07 across the TW7 district. This is market context for the town, not a land valuation: what a plot is worth depends on what can be built on it, which these figures do not show.
Sales in 24 months
661
Median sale price
£497,500
Median £ per m² of floor area
£6,511
Median, last 12m vs prior 12m
-1.8%
£498,975 → £490,000
Mix of sales: 2% detached, 24% semi-detached, 31% terraced, 43% flats.
New-build sales 2023–2024: 0 of 680 (0%). A rough proxy for recent building activity: these are homes sold by builders, not development sites.
For each designation on the planning.data.gov.uk register, the share of the 760 live postcodes in TW7 whose centroid falls inside it. This measures postcodes, not land area, and says nothing about any individual plot.
280 of 760 postcodes
Isleworth Riverside · Spring Grove · Osterley Park · Woodlands Grove · St Margaret's Estate
721 of 760 postcodes
2 separate directions recorded, each removing particular permitted development rights within a defined area. The largest named one is the Dwellinghouses (C3) to small HMOs (C4) - borough-wide Article 4 Direction.
No postcodes in TW7 fall inside: Green Belt, National Landscape (AONB), National Park.
Flood zones, tree preservation orders, local plan allocations, settlement boundaries and non-designated heritage are not included here and are checked in a full assessment.
37% of postcodes fall within a conservation area. Inside one, demolition needs consent, some permitted development rights are reduced, and new work is assessed against the character and appearance of the area.
95% of postcodes are covered by an Article 4 direction, which removes specific permitted development rights in that area, so changes that are automatic elsewhere need a planning application there.
These are town-level facts. The free assessment checks your actual boundary against the same registers and the local plan and tells you plainly what they mean for your plot.
Decided planning applications in Isleworth since 2021, from the council registers, grouped by the kind of scheme a landowner might be weighing up. Extensions, conditions and tree works are left out. Counts, not estimates.
Taken from the units table on the planning form itself, so this is homes actually created, not a reading of the description. 98 decided since 2021, 57 refused.
30 of 98
approved, 31%
48% across London
79 homes approved of 254 applied for
Approved examples
GARAGE ADJACENT TO 20 BYFIELD ROAD, ISLEWORTH (1 new home)
Demolition of the existing six garages and the erection of a part single, part two storey detached house
Approved 2022-10-26, Hounslow ref P/2022/1631
159 JERSEY ROAD, ISLEWORTH (3 new homes)
Conversion of house into three self contained flats with associated landscaping, car and cycle parking and bin storage
Approved 2022-03-08, Hounslow ref P/2021/4887
UNIT 5 LAWRENCE PARADE LOWER SQUARE, ISLEWORTH (1 new home)
Conversion of shop unit into one self contained flat with associated amenities
Approved 2021-12-21, Hounslow ref P/2021/3506
By the kind of plot, from the wording of each proposal:
6 decided since 2021, 4 refused
2 of 6
approved, 33%
36% across London
Approved examples
50 Worton Gardens, Isleworth
Erection of a self/custom build two storey detached house in the rear garden with associated landscaping, cycle and refuse storage following...
Approved 2025-05-27, Hounslow ref P/2025/0671
63 decided since 2021, 30 refused
23 of 63
approved, 37%
45% across London
Approved examples
LAND AT REAR OF 50 THORNBURY ROAD, ISLEWORTH
Erection of detached two storey, three bedroom house with associated car and cycle parking, bin storage following demolition of existing der...
Approved 2022-06-17, Hounslow ref P/2021/3289
3 decided since 2021, 1 refused
2 of 3
approved
51% across London
Approved examples
303 JERSEY ROAD, ISLEWORTH
Demolition of existing house and construction of a pair of three-bedroom, two and a half storey semi-detached houses, with two detached outb...
Approved 2022-09-29, Hounslow ref P/2022/2015
14 decided since 2021, 4 refused
7 of 14
approved, 50%
46% across London
Approved examples
9-10 VICTORY BUSINESS CENTRE FLEMING WAY, ISLEWORTH
Change of use of ground floor units 9 and 10 to provide a residential care and training facility
Approved 2022-07-08, Hounslow ref P/2022/1221
Also decided here: 55 applications for outbuildings, annexes or garden buildings, 41 approved.
Decided planning applications (not extensions, conditions or tree works) from the councils' own registers, summed across the 1 of 1 postcode districts in Isleworth that carry them, classified by the wording of each proposal. Counts, not estimates; within a district, a class with fewer than three applications is not counted.
Hounslow covers 99% of the sampled postcodes in Isleworth.
Borough guide: Selling land in Hounslow
Draw your boundary, tell us what you own, and an architect checks it against these registers and the local plan. Free, no obligation, and you get a straight written answer.
It depends on where the plot sits, not on the town average. Across Isleworth, 0% of postcodes are in the Green Belt and 37% in a conservation area. Outside those designations the questions that decide it are whether the plot is inside or adjoining the settlement boundary in the local plan, whether it has its own road access, and what is next to it.
Often, yes. 95% of postcodes in Isleworth are under an Article 4 direction (2 separate directions), which withdraws particular permitted development rights, so an outbuilding, extension or change of use that is automatic elsewhere needs an application there. Outside those areas, permitted development applies to houses and their gardens but not to agricultural land or paddocks, where a new building or a new use normally needs permission or prior approval.
Developers look at three things before they talk about price: whether the plot is outside the Green Belt and any National Landscape, whether it sits inside or beside the settlement boundary, and what finished homes sell for. In Isleworth the median sale is £497,500, and only 0% of 2023–2024 sales were new-build homes, so builders have been quiet here. A single plot usually goes to a local builder or a self-builder; a site for five or more homes attracts regional housebuilders, normally through an option or a conditional contract rather than an outright purchase, so the price you see quoted is not the price you receive.
There is no town figure for land, because a plot's value comes from what can be built on it, not from where it is. As a guide, a serviced plot with consent for one house commonly sells for around a third of the finished house value, which in Isleworth would be measured against a £497,500 median sale. The same plot without consent, or inside the Green Belt, is worth a small fraction of that, and a paddock with no realistic route to consent is worth agricultural or amenity value only. The free check tells you which of those your plot is before you talk to anyone about a price.
Computed from open-data records; town-level, not plot-level measurements. Isleworth here means the postcode district whose most common post town is Isleworth. Sales: HM Land Registry Price Paid Data (2024-08-01 to 2026-07-31), © Crown copyright, Open Government Licence. Designations: planning.data.gov.uk (OGL); conservation areas and Article 4 directions are made locally and published on that national register. Postcode centroids: OS Code-Point Open, contains OS data © Crown copyright and database right 2026. Figures computed 2026-10-19.