Front boundary walls and the one metre limit

Front wall height planning permission questions come down to one line in the GPDO. A gate, fence, wall or other means of enclosure next to a highway used by vehicular traffic may not exceed one metre above ground level without permission. Anywhere else on the plot the limit is two metres. Those are the figures in Part 2 Class A of Schedule 2 to the General Permitted Development Order 2015, and they apply to the finished height including any coping, trellis or lighting on top.

The exception that saves most projects is in the same Class. Where you are maintaining, improving or altering an existing enclosure, you may go back up to its former height even if that exceeds the limit. Rebuilding a collapsing 1.7 metre Victorian front wall to the same height is permitted development. Building a new one is not.

The one metre limit next to a highway

The wording is "adjacent to a highway used by vehicular traffic". Three parts of that phrase do work.

A highway includes the footway as well as the carriageway, so a wall on the back edge of the pavement is next to the highway even though no vehicle drives there. That catches almost every front boundary in a built-up street.

"Used by vehicular traffic" excludes public footpaths and bridleways that carry no vehicles. A wall alongside a rear footpath can therefore be two metres, which is why back garden boundaries onto alleyways are treated differently from front boundaries onto roads.

"Adjacent" is not defined. The sensible reading, and the one in the government's technical guidance, is that it means the boundary next to the highway rather than any structure somewhere in a front garden. Where a front boundary is set back behind a verge or a service strip, ask the council, because the answer depends on what the intervening land is.

Height is measured above ground level at the base of the wall. Where the ground falls or rises across the boundary, councils generally measure from the higher side, and that is worth confirming before you build a retaining structure on a sloping frontage.

The two metre limit elsewhere

Away from a vehicular highway, the limit is two metres, and it applies to the whole enclosure including any addition on top. A 1.8 metre close boarded fence with a 300mm trellis panel is 2.1 metres and outside Class A.

Two practical points follow. A fence on a shared side boundary that steps down towards the front usually crosses from the two metre regime into the one metre regime somewhere near the building line, and the transition point is where the boundary becomes adjacent to the highway. Draw it rather than guessing.

And planting is not development. A hedge of any height is outside Class A altogether, although an evergreen hedge over two metres can be the subject of a high hedges complaint to the council under separate legislation. Where a one metre wall will not give the privacy you want, a one metre wall with a hedge behind it is a lawful answer that a two metre wall is not.

Gates, piers and visibility splays

Gates are means of enclosure, so the same one metre limit applies to a gate on a front boundary. Piers are part of the structure and count towards the height, which is why so many front walls are built at 900mm with 1 metre piers and a dip in between: the piers are the constraint.

Two things sit outside the planning question and cause as much trouble.

A gate that opens outwards over the footway obstructs the highway. The highway authority can require it to be altered, and swinging a gate over a public footway is a problem whatever the planning position. Design gates to open inwards or to slide.

And a new or widened vehicle crossing over the footway needs the highway authority's approval under section 184 of the Highways Act 1980, separately from any planning permission. A crossover refused on visibility grounds leaves you with a lawful wall, a lawful gate and no way to drive in.

Visibility is the point where a compliant wall can still cause a refusal or an objection from the highway authority. A one metre wall at the back of the footway beside a driveway sits exactly at the height that obscures a small child. Where you are creating or altering an access, expect to be asked to splay the wall back at 45 degrees on each side or to drop the return to 600mm.

Listed buildings and curtilage walls

Class A gives no rights at all where the development would be within the curtilage of, or to a boundary of a site containing, a listed building. Every gate, fence and wall at a listed property needs planning permission.

Listed building consent may also be needed, and the reason catches people out. A structure within the curtilage of a listed building that was there before 1 July 1948 is treated as part of the listing. So a Georgian front wall and its railings are very often listed in their own right, and taking them down or altering them without consent is an offence under the Listed Buildings Act.

Where the property is unlisted and sits in a conservation area, Class A rights survive, and demolition of a boundary wall in a conservation area can itself require permission. Check that before the wall comes down rather than after, and where heritage is in play a Heritage Statement explaining the wall's contribution to the street will be expected with any application.

Railings are worth a note of their own. Many front railings were removed during the Second World War and reinstating them is often supported, so an application to raise a boundary back to its historic height with railings on a low wall has a better prospect than a new solid wall of the same height.

Article 4 directions on front boundaries

A direction under article 4 can withdraw Part 2 Class A, and front boundary treatment is one of the things councils most often target, particularly in conservation areas and on planned interwar estates where uniform low walls and hedges define the character.

Where a direction applies, even a 600mm wall may need permission because the direction removes the class rather than lowering a limit. Read the direction itself: they vary in scope, some cover the whole of Class A and some only parts of it, and the published map matters as much as the text.

This is the single most common reason a homeowner discovers after the event that a front wall needed permission. Checking takes ten minutes on the council's constraints map.

Repair and like for like replacement

The provision that permits maintenance, improvement or alteration up to the former height is generous, and it has limits worth understanding.

1. The former height has to be evidenced. Photographs, a survey, or a street view record dated before the works.
2. The enclosure has to exist. A wall demolished years ago and rebuilt is a new wall at today's limits.
3. Alteration means altering what is there, not replacing it with something structurally different in the same position.
4. Materials and appearance are unregulated by Class A, and an Article 4 direction or a conservation area will bring them back into play.
5. The exception does nothing at a listed building, where no Class A rights exist.

Illustrative example: a 1900s terrace with a surviving 1.6 metre brick front wall in poor condition, no Article 4 direction, and the building unlisted. Rebuilding the wall to 1.6 metres in matching brick with a new coping is permitted development under the maintenance limb, evidenced by dated photographs taken before the work. Building the same wall where none existed would need permission. Details here are illustrative.

Where an application is needed, keep it short. A Planning Statement that sets the proposed height and materials against the council's policy on boundary treatment and the prevailing pattern in the street is usually enough, with photographs of the neighbouring frontages. The same attention to historic detail applies to windows, and our note on replacement windows in an unlisted period house covers that ground.

For certainty before a sale, a lawful development certificate under section 192 of the Town and Country Planning Act 1990 confirms that a proposed wall is lawful, and section 191 does the same for one already built.

Enter your postcode on PlanScope to see which reports works at your address are likely to need. 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.