You will need approval however if.
Planning portal roof.
About planning portal adverts if you want to carry out repairs on or re cover less than 25 per cent of the area of a pitch or flat roof you will not normally need to submit a building regulations application.
In most situations this work will need building regulations approval.
Planning permission is not required for repair and or maintenance works to a roof including re roofing provided that the materials used are the same as those being replaced.
Planning permission building regulations new roof lights or skylights will not normally require an application for planning permission providing.
You carry out structural alterations.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.
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.
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.
If the materials to be used will change the appearance of the building or the works are to a dwelling roof in a conservation area planning permission is required.