Planning permission for gates and a boundary wall by a road

A new wall, fence or gate on your front boundary needs planning permission if it would stand more than 1m above ground level where it is next to a highway used by vehicular traffic. Anywhere else in the garden the boundary wall planning permission height limit is 2m. Those two figures come from Class A of Part 2 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015, and they are the whole rule for most houses. The traps are in what counts as the highway, what happens on sloping ground, and whether your rights have been removed.

The height limits that apply next to a highway

Class A permits the erection, construction, maintenance, improvement or alteration of a gate, fence, wall or other means of enclosure. It stops permitting it at 1m above ground level adjacent to a highway used by vehicular traffic, and at 2m elsewhere.

Three details decide most cases. Height is measured above ground level at the point where the structure stands, so a wall built on a raised bank starts from the bank. Where you are altering an existing wall, the permitted height is the greater of its former height or the Class A figure, which means a lawful 1.8m front wall built decades ago can be rebuilt to 1.8m. And the 1m and 2m limits include anything sitting on top: a trellis, a lattice panel, a coping course and finials all count.

Climbing plants do not count, because they are not a structure. A timber frame holding them up does.

Why a highway includes the footway and verge

This is the point that catches people out. Under the Highways Act 1980 a highway means more than the strip of tarmac that cars drive on. It includes the footway, the verge and the land up to the highway boundary, which can sit several metres back from the kerb.

So a wall set 2m behind the kerb line, with a grass verge in front of it, is still adjacent to the highway and still limited to 1m. If you want to know where the highway boundary actually runs, ask the local highway authority for the adopted highway extent rather than relying on your title plan, because the two often disagree.

A private driveway serving a handful of houses is usually not a highway at all. An unadopted road that the public has used without interruption for years may well be one.

Electric gates, swing arcs and visibility

Gates bring in a second regulator. Any gate must be able to open without swinging over the highway, because obstructing a highway is an offence under the Highways Act 1980 regardless of whether planning permission exists. Inward-opening leaves, sliding gates or a set-back of enough depth for a car to stand clear of the carriageway are the standard answers, and highway officers commonly look for a vehicle to be able to wait entirely off the road while the gates operate.

Then there is visibility. Where an existing access is being gated or narrowed, the highway authority will check the splay in both directions from the driver's eye position, usually assessed against Manual for Streets. A 1.8m gate pier on the back edge of the footway can block that splay even where the gate itself is within the height limit, because piers are structures too.

Automation raises a safety duty separate from planning. Powered gates are machinery and have to be risk assessed and installed to the relevant safety requirements. The council will not check that for you.

Walls to listed buildings and in conservation areas

Class A does not apply at all where the work would involve development within the curtilage of a listed building, or to a wall forming the boundary of that curtilage. So any boundary work at a listed property needs a planning application, and if the wall is itself a curtilage structure or part of the listing, listed building consent under section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990 is needed as well. Doing the work without that consent is a criminal offence, not a breach of planning control.

Conservation areas are different and more often misunderstood. Class A is not removed in a conservation area, so a 1m front wall is still permitted development. What is caught is demolition. Taking down an existing wall over 1m adjacent to a highway, or over 2m elsewhere, in a conservation area counts as relevant demolition and needs planning permission under the Town and Country Planning Act 1990. People replace a crumbling Victorian wall with a new one, get the new wall right and get caught on the removal of the old one.

Where the setting of a listed building or the character of a conservation area is engaged, the application will need a Heritage Statement assessing the significance of what is there and the effect of what is proposed. Historic England advice on statements of heritage significance sets out the expected structure.

Article 4 directions on front boundary treatments

Councils can remove permitted development rights by an Article 4 direction, and front boundary treatments are a common target in areas with a consistent streetscape of low railings, hedges or iron gates. Where a direction is in force, even a 600mm wall needs a planning application, and no fee is payable for an application made necessary solely by an Article 4 direction.

Directions are mapped and published. Check the council's own list and the national Article 4 dataset on planning.data.gov.uk before you assume you can build.

Retaining structures and when they need permission

A retaining wall is not really a means of enclosure, and treating it as one is the most expensive mistake in this area. Where a wall holds back ground it is a building or engineering operation, and the height is measured from the lower ground level, not from the terrace behind it. A 900mm wall at the top of a 1.2m drop to the pavement is a 2.1m structure as the council sees it.

Changes in level also matter in their own right. Raising the ground behind a new front wall, or excavating to create a parking space, is an engineering operation that can need permission even where the wall itself would be permitted.

Sloping sites are where this bites hardest. On a road that climbs, a wall of constant coping height will exceed 1m at the downhill end, and the correct answer is to step the wall rather than to average the height. Averaging is not a thing in the GPDO.

Evidence and drawings for the application

For a householder application, the council needs an existing and proposed site plan at 1:200 or 1:500 with the highway boundary and any visibility splays marked, elevations at 1:50 or 1:100 showing heights above existing ground level at both ends of a sloping run, a section through any retaining element, and a materials schedule naming the brick, the bond, the coping and the mortar.

A short Planning Statement is worth writing even though it is not usually a validation requirement for householder work. Use it to deal with the two things an officer has to decide: whether the enclosure harms the character of the street, and whether it affects highway safety. A Design and Access Statement is required only for work in a conservation area or to a listed building, where the council's local list calls for one.

Photographs of the neighbouring boundary treatments do more work than any amount of prose. If three houses in the row already have 1.8m brick walls and piers, show them.

A Lawful Development Certificate under section 192 of the Town and Country Planning Act 1990 is the only formal way to confirm that proposed works are lawful without permission, and it is worth the fee where you are relying on the former-height rule or on an argument about the highway boundary. This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Enter your postcode on PlanScope to see which reports your site needs.