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Free 2026 London Planning Report — Pinner HA5

Red-brick houses with gabled bays and tall chimneys, a white blossom tree and a 20 mph sign on a residential street
HA5 · Pinner · Harrow

Planning and building regulation drawings in Pinner (HA5)

HA5 is Pinner and Hatch End, and in this district the designations on a street usually come before any question of design. Pinner has a medieval village core of timber-framed buildings around the sloping High Street and the Grade I church of St John the Baptist, and Bridge Street, Church Lane and Chapel Lane are among the recorded streets. Around the village sit 1920s and 1930s Metro-land semis and detached houses, and older cottages and estate housing on Waxwell Lane and the Pinner Hill slopes.

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  • London Borough of Harrow granted 83% of 894 householder applications
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Hatch End sits next to it and is a suburb of Edwardian houses, interwar semis and detached homes, with Arts-and-Crafts pockets of gables, timber and tile-hung fronts. Royston Park Road, Courtenay Avenue and Cedar Drive are recorded streets here. Plots are generally large and well treed, which gives room for a considered rear or side addition, but trees bring their own rules: tree preservation orders and root protection areas often shape a footprint and foundation design before any decision on style.

The designations decide the route. Pinner High Street, Pinner Hill Estate and Waxwell Lane are all recorded conservation areas, and further areas around Moss Lane, East End Farm and the Pinnerwood Park Estate narrow where unrestricted work is possible. Article 4 directions apply in several, including Pinnerwood Park Estate and Pinner Hill Estate, so external changes such as windows, roofs, extensions and boundary alterations can need a planning application there. A like-for-like repair is not development and needs no application. Roof enlargements, side extensions and rear extensions of more than one storey are not permitted development in any conservation area.

Planning in Pinner: what to know before you apply

Harrow controls development in the Pinner conservation areas with particular care for the historic street pattern and for listed and locally listed buildings, so the effect on the setting of a listed neighbour is weighed as well as the house itself. In the Article 4 areas the council requires an application for the changes each direction covers, which would otherwise be permitted. Hatch End's larger detached plots still face scrutiny of scale and of the effect on a low-density street scene, and visible elevations with gables or tile-hanging call for careful material matching. Harrow also uses Article 4 directions for HMO conversions in designated wards, and a tree survey is sensible before footprints are fixed. A flat has no householder permitted development rights anywhere in HA5.

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

Check your route

Does your Pinner project need planning permission?

Route check · Pinner (HA5)

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.

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Pinner (HA5) in numbers

What London Borough of Harrow has decided, and what HA5 is built of — the two facts that shape every job here.

Householder planning decisions — London Borough of Harrow

Pinner (HA5) 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 HA5 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 HA5 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 HA5 is built of

Residential building form across Pinner (HA5), from 364 classified buildings — the fact that decides party walls, side returns and loft headroom before any policy does.

Attached on more than one side26%
Attached on one side52%
Detached23%
Median building footprint88 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate1.18
Buildings classified364

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 Pinner 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 HA5

Pinnermedieval village core surrounded by inter-war Metro-land suburbHatch Endpredominantly Edwardian and interwar
Nearby

Nearby postcode districts

Wealdstone HA3Stanmore HA7Rayners Lane HA2Canons Park HA8Harrow on the Hill HA1Wembley Park HA9Sudbury HA0
FAQ

Pinner (HA5) — FAQs

Will a tree preservation order stop me extending in Hatch End?+
Not necessarily, but it changes the design. Mature trees and their root protection areas often fix how close a foundation can go. We identify protected trees and plan the footprint and foundation type around them before submission.
Does Article 4 apply to every Pinner street?+
No. Harrow has made Article 4 directions in several Pinner conservation areas, including Pinnerwood Park Estate and Pinner Hill Estate, but not across the whole postcode. We check the exact status of your address before recommending an application route.
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