Do I need permission for a loft conversion?
Most dormer loft conversions in Brighton fall under permitted development. Therefore, you most likely won’t need planning permission. Mansard loft conversion requires planning permission because it alters the roof structure. It is important that you know the limitations and specific conditions of a permitted development.
Err on the side of caution by obtaining a Lawful Development Certificate from the local development authority. It is a certificate that proves your loft conversion is legal and could validate your loft conversion when you want to sell your home.