Erection of a rear roof extension involving an increase in the ridge height by 100mm; erection of a rear extension at second floor level, on top of the existing back addition; erection of rear extension at lower ground floor levels following the removal of existing conservatory and rear external staircase; installation of new French doors to replace the existing window and the formation of a roof terrace at upper ground floor level to the rear elevation; alterations to the roof of single storey back addition and the rear fenestration; installation of 3no rooflights in the front roofslope; conversion of the existing property into 1 x two bedroom maisonette and 2 x one bedroom self-contained flats; alterations to external stair case in front garden; lowering of rear garden levels.