Land by postcode · HA area · HA3
What the open records say about the HA3 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 Harrow.
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
634
Median sale price
£550,000
Median £ per m² of floor area
£6,667
Median, last 12m vs prior 12m
+0.6%
£550,000 → £553,500
Mix of sales: 7% detached, 40% semi-detached, 28% terraced, 24% flats.
New-build sales 2023–2024: 14 of 643 (2%). 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 1262 live postcodes in HA3 whose centroid falls inside it. This measures postcodes, not land area, and says nothing about any individual plot.
19 of 1262 postcodes
Harrow
56 of 1262 postcodes
Northwick Circle · Mount Stewart · West Drive Conservation Area · The Grimsdyke Estate and Brookshill Conservation A
288 of 1262 postcodes
5 separate directions recorded, each removing particular permitted development rights within a defined area.
No postcodes in HA3 fall inside: 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.
2% of postcodes in HA3 are inside the Green Belt, so Harrow has land both inside and outside it. Which side of the boundary a plot sits on determines whether the Green Belt tests apply to it at all.
23% 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 HA3 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. 132 decided since 2021, 70 refused, typically 89 days to a decision.
47 of 132
approved, 36%
47% across London
114 homes approved of 313 applied for
Approved examples
1 Draycott Avenue, Harrow (9 new homes)
Demolition of existing detached dwellinghouse and erection of a part four storey, part three storey part 2-storey apartment block providing ...
Approved 2021-08-13, Brent ref 21/1064
65 Draycott Avenue, Harrow (2 new homes)
Erection of two detached two-storey dwellinghouses, installation of vehicular access, creation of off-street parking, provision for cycle an...
Approved 2021-12-22, Brent ref 21/3992
163 Preston Hill, Harrow (6 new homes)
Demolition of existing dwelling and erection of 3 storey building to accommodate 6 self-contained flats creation of a new vehicle crossover ...
Approved 2023-05-16, Brent ref 22/1971
By the kind of plot, from the wording of each proposal:
41 decided since 2021, 20 refused, typically 85 days to a decision
16 of 41
approved, 39%
41% across London
Approved examples
65 Draycott Avenue, Harrow
Erection of two detached three bedroom dwellinghouses, installation of vehicular crossover, creation of off-street parking, provision for cy...
Approved 2023-05-15, Brent ref 22/3820
14 Preston Waye, Harrow
Erection of two-storey detached dwellinghouse, subdivision of garden with boundary treatment, associated landscaping, off-street parking spa...
Approved 2024-01-12, Brent ref 23/3132
14 Preston Waye, Harrow
Erection of two-storey detached dwellinghouse, subdivision of garden with boundary treatment, associated landscaping, off-street parking spa...
Approved 2024-07-03, Brent ref 24/1253
16 decided since 2021, 4 refused, typically 112 days to a decision
8 of 16
approved, 50%
43% across London
Approved examples
1 Draycott Avenue, Harrow
Demolition of existing detached dwellinghouse and erection of a part four storey, part three storey part 2-storey apartment block providing ...
Approved 2021-08-13, Brent ref 21/1064
65 Draycott Avenue, Harrow
Erection of two detached two-storey dwellinghouses, installation of vehicular access, creation of off-street parking, provision for cycle an...
Approved 2021-12-22, Brent ref 21/3992
25 Brookfield Crescent, Harrow
Erection of 3x new detached dwellinghouses with associated bin stores and cycle storage.
Approved 2024-10-01, Brent ref 24/1724
9 decided since 2021, 3 refused, typically 72 days to a decision
4 of 9
approved, 44%
49% across London
Approved examples
163 Preston Hill, Harrow
Demolition of existing dwelling and erection of 3 storey building to accommodate 6 self-contained flats creation of a new vehicle crossover ...
Approved 2023-05-16, Brent ref 22/1971
12 Robin Grove, Harrow
Substantial demolition of existing dwellinghouse and erection of a new dwellinghouse
Approved 2026-03-20, Brent ref 25/3499
42 Bellfield Avenue, Harrow Weald
Demolition of existing dwellinghouse to allow the construction of a new two storey dwellinghouse with accommodation in roof; Boundary Treatm...
Approved 2024-05-09, Harrow ref PL/0801/23
6 decided since 2021, 3 refused, typically 87 days to a decision
2 of 6
approved, 33%
45% across London
Approved examples
133 Carmelite Road, Harrow Weald
Use of outbuilding as self-contained annexe incidental to main dwelling
Approved 2023-06-16, Harrow ref P/1168/23
133 Carmelite Road, Harrow Weald
Use of outbuilding as self-contained annexe incidental to main dwelling
Approved 2024-07-01, Harrow ref P/2265/23
Also decided here: 54 applications for outbuildings, annexes or garden buildings, 35 approved, typically 76 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.
HA3 is split between planning authorities: Harrow (77% of sampled postcodes), Brent (23% of sampled postcodes).
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 HA3, 2% of postcodes are in the Green Belt, 4% in a conservation area. On Green Belt or National Landscape plots a new home is the exception and needs a specific case; a replacement dwelling, a conversion or a modest extension is usually the realistic route there. 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. 23% of postcodes in HA3 are under an Article 4 direction (5 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 HA3 the median sale is £550,000, and only 2% 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 HA3 would be measured against a £550,000 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: the 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.