How high can a garden wall be without planning permission in the UK?

The general rule under permitted development is that a garden wall can be up to 2 metres high without planning permission. That drops to 1 metre where the wall sits next to a highway used by vehicles or the footpath of one — which for most homes means anything along the front boundary.

There are important exceptions. If your property is in a conservation area, is a listed building, or your council has made an Article 4 direction removing permitted development rights, those allowances may not apply — and some newer estates carry planning conditions restricting boundary walls too. A quick check with your local planning authority costs nothing, and the Planning Portal's guide to fences, gates and garden walls is the authoritative reference.

Two practical points people miss. First, planning and structure are separate issues: a retaining wall holding back more than 1 metre of earth needs Building Regulations sign-off regardless of planning. Second, if the wall sits on a shared boundary, talk to your neighbour first — party wall disputes are far more common than planning ones.

If the wall is part of a wider garden project, our garden landscaping cost guide covers walls, patios and fencing, and you can compare quotes from vetted local landscapers free of charge.