You will need approval however if.
Planning portal roof.
They do not protrude more than 150mm beyond the plane of the roof slope they are no higher than the highest part of the roof.
Planning permission building regulations new roof lights or skylights will not normally require an application for planning permission providing.
Any alteration to project no more than 150 millimetres from the existing roof plane.
You do not normally need to apply for planning permission to re roof your house or to insert roof lights or skylights as the permitted development rules allow for roof alterations subject to the following limits and conditions.
About planning portal adverts after a period of time the roof on existing buildings will need to be replaced.
In most situations this work will need building regulations approval.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
You carry out structural alterations.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.