Land by postcode · TW area · TW7
What the open records say about the TW7 postcode district in Greater London: recent sales, planning designations and controls, and the council that decides applications. District-level facts to read before you sell or develop a plot in Isleworth.
Residential sales recorded by HM Land Registry between 2024-08 and 2026-07. This is market context for the district, 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.
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 district-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 TW7 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, typically 85 days to a decision.
30 of 98
approved, 31%
47% across London
79 homes approved of 254 applied for
Approved examples
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
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
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
By the kind of plot, from the wording of each proposal:
6 decided since 2021, 4 refused, typically 64 days to a decision
2 of 6
approved, 33%
36% across London
Approved examples
104 SYON LANE, ISLEWORTH
Retrospective application for a single storey outbuilding to the rear of the house.
Approved 2022-05-20, Hounslow ref P/2022/1097
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, typically 91 days to a decision
23 of 63
approved, 37%
43% across London
Approved examples
303 JERSEY ROAD, ISLEWORTH
Erection of a pair of semi-detached three bedroom houses with associated works, following demolition of the existing house.
Approved 2021-06-04, Hounslow ref P/2021/0661
93 ST JOHNS ROAD, ISLEWORTH
Erection of a two-storey building comprising of a three-bedroom house with associated car parking, cycle space and minor alterations to exis...
Approved 2021-09-29, Hounslow ref P/2021/2951
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, typically 82 days to a decision
2 of 3
approved
49% across London
Approved examples
2A COLLEGE ROAD, ISLEWORTH
Demolition of existing bungalow and erection of a four bedroom dwellinghouse.
Approved 2021-07-27, Hounslow ref P/2021/1761
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, typically 86 days to a decision
7 of 14
approved, 50%
45% across London
Approved examples
38 ROXBOROUGH AVENUE, ISLEWORTH
Conversion of the garage into a habitable room of the house
Approved 2021-07-23, Hounslow ref P/2021/2421
UNIT 5 LAWRENCE PARADE LOWER SQUARE, ISLEWORTH
Conversion of shop unit into one self contained flat with associated amenities
Approved 2021-12-21, Hounslow ref P/2021/3506
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, typically 63 days.
Decided planning applications (not extensions, conditions or tree works) in this postcode district from the councils' own registers, classified by the wording of each proposal. Counts, not estimates; where a class has fewer than three applications it is not shown.
Hounslow covers 99% of the sampled postcodes in TW7.
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 district average. In TW7, 0% of postcodes are in the Green Belt, 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. A plot on the edge of a village or town with access has the best chance; an open field outside the settlement boundary rarely gets consent for housing whatever the market is doing.
Often, yes. 95% of postcodes in TW7 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 TW7 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 district 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 TW7 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.
Three places: Hounslow's local plan and its policies map for the settlement boundary and allocations, the council's planning register for what has been approved or refused on neighbouring land, and planning.data.gov.uk for the national designations. That is an evening's work if you know what you are looking for. The alternative is to draw your boundary on this site: an architect checks it against the same records and writes back within 48 hours with a plain answer, free and without obligation.
Computed from open-data records; district-level, not plot-level measurements. 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), retrieved 2026-09-05; conservation areas and Article 4 directions are made locally and published on that national register. Postcode centroids: OS Code-Point Open 2026.3.0, contains OS data © Crown copyright and database right 2026. Place name is the most common post town in the sales records. Figures computed 2026-09-06.