- it would be over 1 metre high and next to a highway used by vehicles (or the footpath of such a highway); or over 2 metres high elsewhere; or
- your right to put up or alter fences, walls and gates is removed by an article 4 direction or a planning condition; or
- your house is a listed building or in the curtilage of a listed building.
- the fence, wall or gate, or any other boundary involved, forms a boundary with a neighbouring listed building or its curtilage.
You will not need to apply for planning permission to take down a fence, wall,or gate, or to alter, maintain or improve an existing fence, wall or gate (no matter how high) if you don't increase its height. In a conservation area, however, you might need planning permission for relevant demolition in a conservation area to take down a fence, wall or gate.
You do not need planning permission for hedges as such, though if a planning condition or a covenant restricts planting (for example, on "open plan" estates, or where a driver's sight line could be blocked) you may need planning permission and/or other consent.