Single storey rear outbuilding for use as a gym, store and home office (retrospective)

Conversion of dwelling house into 6 self-contained residential units; single storey rear extension; rear roof dormer extension to replace pre-existing roof dormer; installation of roof lights to the front, rear and side roof slopes; single storey detached garden outbuilding for use as gym/office/garden room; and associated external alterations, refuse and cycle parking provision and landscaping (retrospective).