Erection of a rear extension at second floor level over part of the existing back addition; retrospective permission for roof terrace at second floor level, on top of existing back addition; installation of sliding doors in the rear elevation of the proposed rear extension at second floor level, to provide access to the existing roof terrace; erection of a single storey rear extension to the side of the existing back addition; excavation of the front, rear and side gardens to form lightwells in connection with the enlargement of the existing basement; installation of 3no rooflights to replace the existing rooflights in the front roofslope; installation of sliding doors with a Juliet balcony to replace the existing window in the rear roofslope; alterations to the roof of single storey back addition; installation of new doors to replace the existing doors at ground floor level to the rear elevation; conversion of the existing dwellinghouse into 2 x 3.