Removal of existing terrace fencing, staircase and structure from the second floor roof of back addition; erection of a dormer to house an internal staircase in the rear roofslope; erection of glass balustrades at main roof level in connection with its use as a terrace; installation of planter pockets on metal railings, re-location of boiler flue and timber decking at main roof level; installation of 2no air conditioning units at roof level, erection of external staircase and glass balustrades including timber decking above the second floor roof of back addition.