Driveway gates, visibility splays and the highway

A pair of 1.8 metre timber gates across a driveway needs planning permission. The limit under Class A of Part 2 of the General Permitted Development Order 2015 is one metre for a gate, wall, fence or other means of enclosure adjacent to a highway used by vehicular traffic, or to the footway of such a highway. Two metres applies everywhere else in the curtilage. Almost every set of driveway gates people actually want falls on the wrong side of that line.

Then there is a second consent that has nothing to do with the planning department. The crossing over the footway and verge, the dropped kerb itself, is the highway authority's decision under section 184 of the Highways Act 1980. The two run separately and neither substitutes for the other.

The height rule, read carefully

"Adjacent to a highway used by vehicular traffic" covers the front boundary of most houses. It also covers a side boundary where the plot fronts two roads, which catches corner plots regularly, and the owner who built a two metre fence along the flank is usually surprised.

Class A also permits the maintenance, improvement or alteration of an existing enclosure, provided the work does not increase its height beyond what was there before or beyond the applicable limit. A gate replacing a gate of the same height is fine. A gate replacing a low wall is not.

The class does not apply within the curtilage of a listed building at all, so gates and railings at a listed house need planning permission and may need listed building consent as well where they form part of the listing or its curtilage. Article 4 directions in conservation areas commonly remove Class A rights, which is why so many townscape conservation areas have consistent boundary treatments.

An application for gates above the limit is judged on appearance and on highway safety. Solid gates on a front boundary in an open plan estate usually fail on character. The same gates on a Victorian villa in a street of walled front gardens usually succeed. Look at the street before you look at the catalogue.

The access itself

Forming a new means of access is separate development. Class B of Part 2 permits the formation of an access to a highway that is not a trunk road or classified road, but only where the access is required in connection with development permitted by another class in the Order. A standalone new driveway to an existing house does not qualify, which surprises people who expect the class to cover it.

In practice the position runs like this. Onto an unclassified road, the crossing application to the highway authority is usually the whole process, and the authority's approval of the crossing deals with the engineering. Onto a classified or trunk road, planning permission is required for the access as well, and the highway authority becomes a consultee rather than the sole decision maker.

Find out which category your road is in before anything else. Councils publish the list, and the answer changes the project from a form and a fee to an application with drawings.

Visibility splays, in plain terms

A visibility splay is a triangle at the access kept clear of obstruction above a low height, typically around 600 millimetres, so a driver waiting to emerge can see traffic coming. It is defined by two dimensions.

The setback, sometimes called the x distance, is how far back from the edge of the carriageway the driver's eye is assumed to be. On a domestic access that is commonly 2 metres to 2.4 metres.

The sight distance, the y distance, is how far along the road the driver must be able to see in each direction. It is derived from stopping sight distance at the road's speed. National guidance on residential street design gives a table of stopping sight distances that many authorities adopt directly, with the figure at 30mph in the region of 40 to 45 metres and shorter distances on slower roads. Local highway authorities publish their own standards and those take precedence.

Two practical consequences. A hedge, wall or parked car inside the splay defeats it, so the splay has to be within land you control or within the highway. And a splay measured from a gate set hard on the boundary is measured from behind the gate, which is why setback and visibility are the same problem.

Setting the gates back

Gates that open outwards over the highway are an obstruction, and highway authorities refuse them. Inward opening or sliding gates avoid the issue.

The setback matters separately. A vehicle stopping to open gates on the boundary stands in the carriageway while it does so, which is unsafe on any road carrying traffic. Authorities commonly look for enough depth for a car to stand clear, expressed as something in the order of five to six metres from the carriageway edge, and more where larger vehicles are expected. A short front garden is the usual reason a gate scheme fails, and the honest answer is sometimes that the plot cannot take gates at all.

Electric gates add a layer. They are treated as machinery for safety purposes, needing a risk assessment, force limitation and safe operation, and the installer should provide the documentation. That is a separate regime from planning, and it does not affect whether permission is needed.

Documents and the application

For a householder application covering gates and, where required, the access, the pack is short: forms, ownership certificate, location plan, block plan showing the splays, elevations of the gates with dimensions and materials, and the fee.

A short planning statement is optional and often decides the outcome, because it lets you deal with character and highway safety before an objector raises either. Include a photograph of the street showing other gated frontages if they exist, the visibility splay dimensions achieved, the gate setback, and confirmation that the gates open inwards.

Where the gates come with a rendered wall or new piers, check the rules on changing the external finish of the house at the same time, since boundary treatments and wall finishes are judged together in a conservation area. And if the driveway extends into land beyond the garden, the question of what counts as curtilage becomes relevant, because permitted development rights stop at the curtilage boundary.

An illustrative scheme

Illustrative example. A 1930s house on an unclassified 30mph road with a 7 metre front garden. Proposal: 1.8 metre metal gates, inward opening, set 5.5 metres back from the carriageway edge, with the boundary hedge cut back to give a 2.4 metre by 43 metre splay in each direction and maintained below 600 millimetres. Planning permission is needed for the gates because of the height. The crossing is widened under a section 184 application. The dimensions are illustrative and the local highway standard governs.

Two forms, two departments, one project. Start with the highway authority, because if the crossing cannot be approved, the gates are academic.

Check your address on PlanScope to see whether a conservation area, listing or Article 4 direction changes what you can do at the 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.