Boundary fence and wall heights: when permission is needed

A boundary fence or wall can go up to 2 metres in height under permitted development, dropping to 1 metre where it fronts a highway used by vehicles, and above those limits you need planning permission. That is the whole of the boundary fence planning height rule in one sentence, and it is where most disputes start rather than end. Height is measured from natural ground level, trellis counts, and a wall that is lawful in height can still be refused when you apply to go higher because of its effect on a neighbour's light and outlook.

Permitted development heights for fences and walls

Class A of Part 2 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015 allows the erection, construction, maintenance, improvement or alteration of a gate, fence, wall or other means of enclosure. The height limits are the whole substance of the class.

Three details do most of the damage in practice. Height is taken from natural ground level, so building a 2 metre fence on top of a 600 millimetre raised bed gives you a 2.6 metre structure in planning terms. Trellis, wire and any lattice on top is part of the height, whatever a fencing supplier says. And where ground levels differ across a boundary, the measurement is taken from the higher side, which is usually the side that has to look at it.

Class A does not apply within the curtilage of a listed building, and it does not allow a means of enclosure to be erected around a listed building. It can also be withdrawn by an Article 4 direction, which many councils have made over conservation areas and estates with a consistent boundary character. Check the constraints layer for the address before ordering materials.

Highway frontages and the 1 metre limit

The 1 metre rule catches front gardens. A highway used by vehicular traffic includes the footway alongside it, so a fence set behind a pavement is still adjacent to the highway. An unadopted private drive may not be a highway at all, which is why two apparently identical front boundaries in the same street can have different limits.

Corner plots are the classic problem. A side boundary that runs along a second road is also a highway frontage, so the 1 metre limit applies down the whole flank. Highway authorities also look at visibility for drivers leaving a driveway, and a 1 metre solid wall right on a bend can still attract an objection on highway safety grounds when you apply for something taller.

Gates across a driveway are means of enclosure too, and they carry the same limits. A gate that opens outwards over a footway raises a separate obstruction issue, so specify inward opening or sliding gates on the drawing.

When a boundary structure needs permission

You need a householder planning application where the structure exceeds the limits, where permitted development rights have been removed by condition or Article 4 direction, or where the works fall within the curtilage of a listed building. Retaining walls are a common grey area: a structure retaining a change in level is an operation in its own right, and where it also encloses the plot the height is judged on the retained face.

A Lawful Development Certificate is the only formal way to confirm that a boundary structure is lawful without permission. If you are about to sell, or if a neighbour has already complained, that certificate is worth more than an email from an officer.

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

Overshadowing and enclosure from a boundary wall

Once you apply, height stops being the question and amenity takes over. Officers weigh three effects: loss of light to windows and gardens, a sense of enclosure from a tall structure close to a habitable room, and loss of outlook.

The rules of thumb used for extensions, such as the 45 degree line taken from the nearest window, do not transfer neatly to a 2.5 metre wall on a boundary. What matters is distance and orientation. A tall wall on the northern boundary of your own garden casts its shadow onto your land and rarely troubles anyone. The same wall on the southern boundary of a small terraced garden takes the sun off a neighbour's patio for most of the day in winter, and that is a sustainable reason for refusal.

Where a scheme is larger than a domestic fence, for example a boundary wall to a new development next to existing homes, the effect on neighbouring gardens and windows is tested properly. An Overshadowing Study models shadow paths across the equinox and the solstices, and a Daylight and Sunlight Assessment applies the BRE 209 tests to affected windows. For a householder fence that level of evidence is disproportionate, and a simple sun path sketch with photographs usually answers the point.

The separate high hedges procedure

Planning has nothing to say about a hedge you have already grown. Hedges are dealt with under Part 8 of the Anti-social Behaviour Act 2003, and the test is narrow.

The council can only act where the hedge is formed wholly or predominantly by a line of two or more evergreen or semi-evergreen trees or shrubs, rises more than 2 metres above ground level, and acts as a barrier to light or access to a domestic property. A single tree is outside the regime, however large. A deciduous beech or hornbeam hedge is outside it too, unless it holds its leaves in a way that makes it semi-evergreen.

You have to show you have tried to settle it with the hedge owner first. The council charges a fee for the complaint, set locally, and it can be several hundred pounds. If the complaint succeeds the council issues a remedial notice specifying works and a compliance date, and either party can appeal to the Planning Inspectorate. Failure to comply with a remedial notice is an offence.

Evidence to submit with an application

For a boundary application that exceeds the permitted development limits, keep the pack short and precise:

1. Location plan at 1:1250 with the site edged red.
2. Existing and proposed boundary elevations at 1:50 or 1:100, with heights annotated from natural ground level on both sides.
3. A cross section through the boundary where levels differ, showing existing and proposed ground levels.
4. Photographs of the existing boundary and of the outlook from the neighbouring windows most likely to be affected.
5. A short statement explaining the reason for the height, whether that is privacy, security, screening of a road, or noise.
6. Materials and finish, including whether the structure will be planted or stained.

Reasons matter. A 2.4 metre close boarded fence "for privacy" along a garden shared with a bungalow is a hard sell. The same height in dark stained timber, stepped down towards the rear and softened with planting, with a written explanation about overlooking from a new first floor window next door, is a case an officer can support.

Enforcement where a fence exceeds the limits

Councils take enforcement action at their discretion, and they are expected to act proportionately. The usual first step is a letter inviting you to apply retrospectively or to reduce the height. An enforcement notice can require removal or reduction, and there is a right of appeal to the Planning Inspectorate against the notice.

Time limits for enforcement against operational development are set by section 171B of the Town and Country Planning Act 1990. The Levelling-up and Regeneration Act 2023 changed those limits in England, and the commencement and transitional arrangements matter to whether an older fence is immune, so check the current position rather than assuming the four year rule still applies to your case.

If you want the whole boundary treated properly as part of a wider scheme, browse the report types on PlanScope and see which ones a site with sensitive neighbours is likely to need. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.