Front boundary walls, fences and gates: height limits

Fence height planning permission comes down to one line in the General Permitted Development Order. A gate, fence, wall or other means of enclosure can be put up without permission if it is no more than 1 metre high where it is adjacent to a highway used by vehicular traffic, or a footway of such a highway, and no more than 2 metres high anywhere else in the curtilage. Above those heights you need an application, and the same limits apply when you alter, improve or maintain an existing enclosure so that it ends up taller.

The 1 metre limit is the one that catches people, because most front gardens are adjacent to a road.

The 1 metre and 2 metre limits

Part 2 Class A of the Order permits the erection, construction, improvement or alteration of a gate, fence, wall or other means of enclosure, subject to those two heights. Trellis on top counts. A pergola built into the line of a fence counts. Planting does not, because a hedge is not a means of enclosure for these purposes, which is why the front garden hedge next door can be 3 metres tall when your fence cannot.

Two exclusions matter more than the heights themselves. Class A does not permit any development within the curtilage of a listed building, so a new wall, fence or gate at a listed house needs planning permission whatever its height. And the right is removed where an Article 4 direction says so, which is common in conservation areas and on some estates.

Retaining structures complicate the measurement. Where a fence sits on top of a retaining wall, councils generally treat the whole thing as a single structure and measure from the lower ground level. That turns a 1.8 metre fence on a 0.6 metre retaining wall into a 2.4 metre enclosure that needs permission.

What counts as adjacent to a highway

A highway includes carriageways, footways alongside them, and in many cases public footpaths and bridleways, though the 1 metre limit specifically applies where the highway is used by vehicular traffic or is a footway of such a highway. A private drive shared with neighbours is usually not a highway. A cul-de-sac turning head almost always is.

"Adjacent" is not defined in the Order and has been interpreted broadly by the courts, which means a wall set back a few metres behind the footway can still be adjacent to it. There is no reliable set-back distance that takes a front boundary outside the rule, and an officer looking at a corner plot will treat the flank boundary as adjacent to the side road as well as the front boundary being adjacent to the front road.

Corner plots are where most enforcement letters land. The house has two frontages, both of them limited to 1 metre, and the owner has fenced the side garden to 1.8 metres for privacy. Where the highway authority also has a visibility splay at the junction, refusal of a retrospective application is likely on highway safety grounds as well as on appearance. The same principal elevation logic that governs side extensions on terraced and end-terrace houses does not help here, because Part 2 uses proximity to the highway rather than the position of the elevation.

Listed buildings and curtilage walls

A boundary wall, railing or gate within the curtilage of a listed building and in place before 1 July 1948 is generally treated as part of the listed building. Altering or demolishing it needs listed building consent, and carrying out those works without consent is a criminal offence rather than a planning breach.

That catches ordinary maintenance more often than people expect. Repointing a garden wall in cement rather than lime, replacing decayed railings with a modern profile, or raising a gate pier all affect the character of the listed structure. Get the works agreed in writing first, and support the application with a heritage statement that describes the wall's fabric, its contribution to significance, and the method proposed.

Listed building consent and planning permission are separate. You may need both, and neither carries the other.

Conservation areas and demolition

Demolishing a boundary wall in a conservation area is not automatically free. Planning permission is needed for the demolition of a gate, fence, wall or means of enclosure in a conservation area above the heights set out in the 2014 demolition direction, which broadly mirrors the 1 metre and 2 metre thresholds. Below those heights the demolition falls outside the requirement.

The practical result is that taking down a 1.5 metre Victorian front wall to make a parking space in a conservation area needs permission for the demolition, and permission is often refused because front boundary walls are one of the defining features of a Victorian or Georgian street. Where a wall has to come down for an access, expect the council to ask for the piers to be retained and the wall rebuilt in matching brick with the original coping.

Article 4 directions in conservation areas frequently remove Part 2 Class A entirely, so a 1 metre fence that would be permitted elsewhere needs an application.

Hedges, the high hedges rules and civil disputes

Planning law does not control hedge height. Part 8 of the Anti-social Behaviour Act 2003 does, and only for a specific case: a line of two or more mostly evergreen or semi-evergreen trees or shrubs over 2 metres high that acts as a barrier to light or access.

The route is a complaint to the council after the neighbours have tried to settle it themselves, with a fee that the council sets. If the complaint succeeds the council issues a remedial notice specifying works. Deciduous hedges, single trees and boundary disputes about the line of ownership are all outside the scheme, and those remain civil matters between neighbours.

Overhanging branches are also a civil matter. You may cut back to the boundary, the cuttings belong to the tree owner, and none of that applies if the tree is protected by a Tree Preservation Order or stands in a conservation area.

Measuring, and what to do when you are over

Height is measured from the natural ground level immediately adjacent to the enclosure. Where the ground slopes, the height is taken at each point along the run rather than averaged, so a fence that is compliant at one end can breach at the other. Where levels differ on the two sides, councils generally measure from the higher side for the purposes of the limits.

If the enclosure is already up and over height, three options exist:

1. Reduce it to the permitted height, which needs no application and ends the matter.
2. Apply for planning permission retrospectively, addressing highway visibility, the character of the street and any effect on neighbouring outlook.
3. Apply for a lawful development certificate if you believe the works were permitted, which is the only formal way to confirm that they are lawful.

Enforcement is discretionary and time-limited, but a breach that blocks a junction sightline attracts attention quickly. The cost of taking down and rebuilding a rendered blockwork wall is a good reason to check the position first. The rules for rear extension depths sit in a different Part of the same Order, and satisfying one does not tell you anything about the other.

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

If your boundary works need an application, enter your postcode on PlanScope to see which supporting documents the council will expect. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.