You do not usually need to apply for planning permission for:
New roof lights or skylights will not normally require an application for planning permission as long as certain conditions are met (see link below or ‘Roof Window’ for details).
Occasionally, you may need to apply for planning permission for some of these works because your council has made an Article 4 Direction withdrawing permitted development rights. If you live in a listed building, you will need listed building consent for any significant works – internal or external.
Learn more on the Planning Portal.