How high can a fence be without planning permission?

Up to 1 metre if adjacent to a highway used by vehicles. Up to 2 metres elsewhere. These are the GPDO maximums.

Do I need planning permission for a garden wall?

Not if the wall is under 2 metres high (or 1 metre adjacent to a highway). Higher walls, or walls in areas with Article 4 Directions, need planning permission.

How much does fencing cost?

Boundary treatment costs in London typically range from £1,000 to £5,000 depending on length and materials. Timber fencing is cheapest, brick walls and metal railings cost significantly more.

Can I replace an existing fence with a taller one?

Yes, provided the replacement stays within the PD height limits (1m by highway, 2m elsewhere). The previous height is not relevant — it's the new height that matters.

Fence, wall or gate in Harrow: Planning Permission Guide

Your guide to fences, walls, and gates in Harrow — height limits, permitted development rules, and costs.

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Fence, wall or gates in Harrow at a glance

76%

approved

£258

application fee

weeks typical

Based on 34 decided applications in Harrow over 12 months (26 granted, 8 refused).

Harrow has conservation areas around Harrow-on-the-Hill (a distinctive hilltop village with very strict design controls), Pinner, and Stanmore. Listed buildings are concentrated in Harrow-on-the-Hill and around Harrow School. Green Belt borders the north and west of the borough around Stanmore Common and Harrow Weald. Article 4 Directions cover parts of Harrow-on-the-Hill. The borough has a mix of inter-war semis, garden suburb character, and older village cores.

Council planning portal Pre-application advice

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Recent fence, wall or gate decisions in Harrow

The 5 most recent decided applications. Addresses redacted to postcode area.

Withdrawn

Partial reconstruction of a brick and flint boundary wall and arch to front

HA52026-03-29

Refused

Details pursuant to Conditions 7 (Hard and Soft Landscaping) & 9 (Boundary Treatments) attached to planning permission P/3385/19 dated 17…

HA12026-03-09

Refused

Construction of new fenced multi-use games area (MUGA) with perimeter fencing and associated works.

HA12026-03-09

Granted

Widening of vehicle access, Installation of 2.3m sliding gates

HA12026-03-09

Granted

Details pursuant to Conditions 5 (Boundary Treatment), 7 (Disposal of Sewage), 8 (Surface Water), 9 (Permeable Paving), 10 (Landscaping),…

HA52026-03-02

These are borough-wide. See the 5 nearest to your address.

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Permitted Development Rules

Class A (Part 2)Part 2

Gates, fences, walls or other means of enclosure

GPDO 2015, Schedule 2, Part 2, Class A

Fences, walls, and gates are covered by Part 2, Class A of the GPDO. The main consideration is height: up to 1 metre next to a highway, up to 2 metres elsewhere.

Key dimension limits

Max 1m adjacent to highwayMax 2m elsewhere

These are the maximum GPDO limits for a detached house with no constraints. Your actual limits depend on your property type, location, and any planning restrictions.

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Typical Costs in London

Boundary treatment costs depend on the length, material, and type — timber fencing is cheapest, brick walls are the most expensive.

Fence, wall or gateLondon

Typical total

£1,000–£5,000

Typically includes

MaterialsInstallationFoundations (for walls)

Typically excludes

Planning application fee

Timber fencing is cheapest. Brick walls and metal railings cost significantly more per metre.

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Which Professionals Do You Need?

Boundary treatments rarely need professional services beyond a competent builder or fencing contractor.

This project is unlikely to need specialist professional services beyond a competent builder.

Architect / designerNot needed

This type of project does not typically require architectural services.

Structural engineerNot needed

Party wall surveyorNot needed

Planning consultantNot needed

This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.

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Conservation Areas & Listed Buildings

In conservation areas, the same height rules apply, but you should consider materials that are sympathetic to the area character. Some Article 4 Directions restrict boundary treatments.

Conservation areas

Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.

Listed buildings

Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.

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Frequently Asked Questions

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Related guides

Driveway

Porch

GPDO Class D

Outbuilding / garden building

GPDO Class E

All guides