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Free 2026 London Planning Report — Wealdstone HA3

Street of red-brick Victorian terraces with white bay windows and gabled roofs in low evening sun, cars parked along the kerb
HA3 · Wealdstone · Harrow

Planning and building regulation drawings in Wealdstone (HA3)

HA3 covers three places with quite different histories. Wealdstone grew up as a railway and factory town, and its Victorian and Edwardian terraces were built as worker housing, with narrow frontages, long slim back gardens and shared party walls. Interwar semis fill the outer roads. Montrose Road, Risingholme Road, Adderley Road, Fisher Road, Hibbert Road and Aberdeen Road are among the recorded streets. Rear and side-return extensions and loft conversions are the projects those compact terraces lend themselves to.

  • MCIAT chartered technologists
  • London Borough of Harrow granted 83% of 894 householder applications
  • Drawings in about 7 days

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Kenton is a 1930s suburb on the Harrow and Brent boundary, made up of interwar semi-detached houses and short terraces. Draycott Avenue and Windermere Avenue are two of its recorded streets. Plots are regular and the rear gardens modest to generous, which suits a single-storey addition. Because the borough line runs close, we confirm which council an address belongs to before preparing anything. Mount Stewart and Northwick Circle are conservation areas protecting pockets of planned layout, and we confirm which council's designation applies to them.

Harrow Weald is a different proposition again. West Drive and Bellfield Avenue carry inter-war Domestic Revival houses, larger detached homes sit on the slopes around Brookshill and Old Redding, and Green Belt land and Harrow Weald Common press on the northern edge. Three conservation areas are recorded here, including Brookshill Drive and Grimsdyke Estate, where an Article 4 direction removes permitted development rights, so external alterations there can need an application. In any conservation area, roof enlargements, side extensions and rear extensions of more than one storey are also outside permitted development.

Planning in Wealdstone: what to know before you apply

Across HA3 Harrow applies its householder design guidance together with the national permitted development limits, which govern depth, height and coverage. In Wealdstone we know of no area-specific Article 4 direction or conservation area, and where an application is needed the council reads proposals against the run of neighbouring terraced houses: matching brick or render, roof tiles and the rhythm of the frontage matter, and party-wall relationships and overshadowing are central to neighbour amenity. In Kenton the conservation areas and the borough boundary add further checks, and in Harrow Weald the conservation areas, the Green Belt and Harrow Weald Common do the same. A flat anywhere in HA3 has no householder permitted development rights. The borough also controls HMO conversions through Article 4 directions in designated wards, a separate question from an extension.

Applications are decided by London Borough of Harrow — its planning pages.

Check your route

Does your Wealdstone project need planning permission?

Route check · Wealdstone (HA3)

Listed building?
Conservation area?
Likely permitted development — no planning applicationNeeds checking
  • A single-storey rear extension up to 4 m deep on a detached house, or 3 m on any other house, is Class A permitted development subject to the height and materials conditions.
  • An Article 4 direction applies here and may withdraw this freedom — the schedule must be checked before relying on it.
  • One or more constraints are unknown — we check the council's registers as part of the free appraisal.
  • Where permitted development applies, a lawful development certificate proves it for lenders and buyers.

Sources: GPDO 2015, Schedule 2, Part 1 · Planning Portal — common projects · Building Regulations 2010 — when approval is needed

This is a first-pass indication from the national rules, not planning advice for your property. Your council's registers, any Article 4 schedule and the exact dimensions decide it — the free appraisal checks all three before we recommend a route.

Confirm it with a free appraisal

Wealdstone (HA3) in numbers

What London Borough of Harrow has decided, and what HA3 is built of — the two facts that shape every job here.

Householder planning decisions — London Borough of Harrow

Wealdstone (HA3) applications are decided by London Borough of Harrow; these are its published householder figures for the last four quarters.

Householder applications decided2025 Q2 to 2026 Q1894
Granted739
Refused155
Grantedof 894 decisions · England 90%83%
Decided within 8 weeksof 677, excluding prior approvals94%

Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Permitted development prior approvals — London Borough of Harrow

How the larger-home-extension route has fared with London Borough of Harrow, which decides HA3 notifications.

Larger home extension prior approvals — not required2024 Q2 to 2026 Q1617
Prior approval granted47
Prior approval refused171
Grantedof 218 determined22%

Source: Ministry of Housing, Communities and Local Government (PS1 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Planning appeals — London Borough of Harrow

Refusals in HA3 can be appealed to the Planning Inspectorate; this is London Borough of Harrow's householder appeal record.

Householder appeals determined2021–2026319
Allowed135
Allowedof 319 · England 36%42%

Source: Planning Inspectorate appeals casework. Open Government Licence v3.0 Extracted 2026-09-22.

Conservation areas and Article 4 directions — London Borough of Harrow

Register counts for London Borough of Harrow. A count describes what the council has published, never a rank against another council.

Conservation areas in the register27

Source: MHCLG Planning Data Platform. Open Government Licence v3.0 Extracted 2026-09-22.

What HA3 is built of

Residential building form across Wealdstone (HA3), from 245 classified buildings — the fact that decides party walls, side returns and loft headroom before any policy does.

Attached on more than one side41%
Attached on one side51%
Detached9%
Median building footprint72 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate1.18
Buildings classified245

Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-09-22.

  1. Day 0Measured survey of your Wealdstone property — or your existing plans if you have them.
  2. About 7 daysDrawings issued for your approval. Free redraws until you are happy.
  3. SubmissionWe validate against London Borough of Harrow’s checklist and submit on your behalf.
  4. Council: 8-week targetHouseholder applications carry an 8-week statutory target. London Borough of Harrow decided 94% of 677 recent householder applications inside it.

Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Neighbourhoods

Streets and neighbourhoods in HA3

Harrow Wealdpredominantly inter-war suburban, with Green Belt estates on the northern slopesKentonpredominantly interwar (1930s semi-detached suburb)WealdstoneVictorian–Edwardian industrial railway town with later interwar streets
Nearby

Nearby postcode districts

Rayners Lane HA2Pinner HA5Harrow on the Hill HA1Stanmore HA7Sudbury HA0Canons Park HA8Wembley Park HA9
FAQ

Wealdstone (HA3) — FAQs

Can I build a side-return extension on my Wealdstone terrace without full planning permission?+
Sometimes. No local Article 4 direction narrows the national limits in Wealdstone, so permitted development can cover a modest single-storey rear or side addition. A side return on a narrow plot is limited by width, height and the party walls, so we measure carefully and confirm the route before drawing.
Is Kenton in Harrow or Brent?+
Both, depending on the street. The suburb straddles the boundary, so the planning authority differs from house to house. We check the address against the council boundary and the Mount Stewart and Northwick Circle conservation areas first.
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