Front walls, railings and the one metre highway limit

A new front garden wall, fence or railing next to a road is limited to one metre in height under Class A of Part 2 of Schedule 2 to the GPDO 2015. Anywhere else in the garden the limit is two metres. Those two figures decide most front boundary projects, and the one metre limit applies to the whole of a boundary adjacent to a highway used by vehicular traffic rather than only to the section facing the road. Build 1.4 metres of brick along the front and you have carried out development without permission.

The second rule people miss is the one about alterations. Improving an existing wall cannot take it above its former height or above the relevant limit, whichever is greater, so a two metre Victorian front wall can be repaired at two metres but a one metre wall cannot be raised.

What Part 2 Class A permits

Class A covers the erection, construction, maintenance, improvement or alteration of a gate, fence, wall or other means of enclosure. That phrasing is wide, and it catches railings, close boarded fencing, a brick wall, a hedge supported on a frame, and a gate across a drive.

Three limits apply. One metre above ground level where the enclosure is adjacent to a highway used by vehicular traffic. Two metres above ground level anywhere else. And for maintenance, improvement or alteration, no increase above the former height or the applicable limit, whichever is greater.

Class A is also excluded entirely within the curtilage of a listed building, or to a boundary of one. That exclusion is absolute, so a front wall at a listed house needs planning permission and usually listed building consent as well.

Part 2 Class A is not withdrawn on article 2(3) land in the way that some householder rights are, so a front wall in a conservation area can still be permitted development. An Article 4 direction may remove it, and directions covering front boundary treatments in historic streets are common.

The one metre limit adjacent to a highway

A highway used by vehicular traffic includes the carriageway and the footway that forms part of it. A public footpath with no vehicular use is not, so a boundary to a rear alley may fall under the two metre limit.

The limit applies to the enclosure adjacent to the highway, which means the whole run of that boundary rather than a notional strip. Where a corner plot has two frontages, both are limited to one metre.

Returns are the common trap. A side boundary running back from the front of the house is often adjacent to the highway for the first few metres and away from it beyond, so the lawful height steps up partway along. Draw that step on the plan rather than guessing on site.

The limit is about height, not materials or appearance. A one metre wall of any material is permitted development, and a council that dislikes the brick cannot refuse something it has no power to decide.

Measuring height on sloping ground

Height is measured above ground level, and on a sloping frontage the measurement follows the ground rather than a single datum. Where the ground level differs on either side of the enclosure, the measurement is taken from the higher ground.

That matters on a plot where the garden sits above the pavement. A wall that reads as one metre from inside the garden can be well over a metre from the footway, and on a raised front garden the lawful height from the garden side will be less than a metre.

Retaining walls raise a separate question. Where a wall holds back a change of ground level rather than simply enclosing, it may be an engineering operation outside Class A, and raising ground levels behind it is itself development. On any plot with a significant level difference, check this before building.

Copings and piers count towards the height. A wall at exactly one metre with a 75 millimetre coping on top is over the limit.

Gates, piers and visibility at the access

A gate across a driveway is a means of enclosure and takes the one metre limit where it is adjacent to the highway. Tall entrance gates between brick piers are therefore a planning application in nearly every case, however common they look on a street.

Two separate rules follow. A gate must not open outwards over the footway, because that obstructs the highway. And where an electric or manually operated gate is set at the back edge of the footway, a vehicle waiting for it to open stands in the carriageway, which the highway authority will object to. The usual fix is a setback of a car length, which most front gardens cannot provide.

Visibility at the access is the other consideration. Even a compliant one metre wall sits above the eye line of a small child on the footway, and the highway authority will often ask for the wall to be reduced to around 600 millimetres within the splay triangle on either side of the drive. That is a reasonable request and it is worth designing in rather than arguing about.

Conservation areas and listed curtilage

Within the curtilage of a listed building, Class A does not apply at all. Planning permission is needed for any new boundary enclosure, and listed building consent is needed where the wall or railing is itself part of the listed building or a curtilage structure. Old front railings and gate piers at a listed house are frequently curtilage listed, so removing or replacing them needs consent even where the house itself is untouched.

In a conservation area the right survives unless an Article 4 direction removes it, but the design still matters when permission is required. A short Heritage Statement explaining the character of the street's boundary treatments and how the proposal reflects them does most of the work in a householder application, and the same approach applies to rendering or cladding a house.

Where the street has a consistent pattern of low walls with railings, follow it. Where original railings were removed during the war and the stubs survive in the coping, reinstating them is usually supported.

Hedges as an alternative

Planting a hedge is not development, so there is no planning height limit on it. That is why a one metre wall with a hedge behind it is the standard answer where privacy matters on a front boundary.

The limit comes from elsewhere. Part 8 of the Anti-social Behaviour Act 2003 lets a neighbour complain to the council about a high hedge, defined as a line of two or more mostly evergreen or semi-evergreen trees or shrubs over two metres in height that blocks light or views. The council can issue a remedial notice requiring reduction.

Deciduous hedges fall outside those provisions, as does a single tree however large. Trees may carry a Tree Preservation Order or conservation area protection, which applies to the tree rather than to the boundary.

A hedge takes a few years to work, which is the honest drawback. And it needs maintaining from both sides, so the position relative to the boundary should be thought about at planting rather than at the first argument.

Confirming the position with the council

Where the height is marginal, the ground slopes, or a listed building is anywhere nearby, get it confirmed rather than relying on a measurement taken with a tape.

A lawful development certificate for proposed development under section 192 of the Town and Country Planning Act 1990 produces a formal decision on the facts and the law, with no policy judgement. It needs a site plan, a cross section through the boundary showing ground levels on both sides, an elevation with the height dimensioned, and a note of the highway classification.

Where permission is needed, a householder application with a short Planning Statement addressing the street scene, visibility at the access and the character of neighbouring boundaries is the normal route. Keep it brief. Front boundary applications are decided on the drawings.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

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