Erection of a rear extension at second floor level, on top of the existing back addition; erection of a replacement single storey rear extension, following the demolition of existing extensions; installation of a rooflight in the front roofslope and rooflights to both side roofslopes of the existing front gable roof, following the removal of an existing rooflight; erection of a dormer window to the rear elevation at roof level and part of second floor level, following the removal of 2no. existing rooflights in the rear roofslope and an existing rear dormer window at second floor level; alterations to the rear and side elevations of existing first floor back addition to include, replacement of external brick facade with timber cladding, replacement of existing rear door with a new aluminium framed door, erection of new painted metal railings to replace existing glass balustrade, installation of a new aluminium framed window to the side; erection of an external staircase to the rear elevation from ground to basement floor level; formation of a glass bridge to the rear elevation at ground floor level; erection of a new brick built shed with a timber front door to replace existing timber shed; excavation of part of the front and rear gardens to form lightwells, in connection with the enlargement of existing basement.