Do I Need Planning Permission for a Loft Conversion?

Most loft conversions in England do not need planning permission under permitted development rights, as long as the work stays within specific volume and design limits.

• Additional roof space does not exceed 40 cubic metres for terraced houses
• Does not exceed 50 cubic metres for detached and semi-detached houses
• No extension higher than the highest part of the existing roof
• No extension beyond the existing roof slope facing a highway
• Side-facing windows must be obscure glazed and non-opening below 1.7 metres
• Materials match the existing house
• No verandas, balconies or raised platforms

• Property is a flat or maisonette
• Property is a listed building
• Volume limits exceeded
• Want to add a balcony or terrace
• Extension faces a highway
• Permitted development rights removed

Rear dormers are almost always permitted development. Front dormers almost always require planning permission.

Any roof addition visible from a highway requires planning permission in conservation areas.

A loft conversion almost always requires building regulations approval for structural work, fire safety, insulation, and means of escape. This is separate from planning permission.