Partial demolition of the 5 storey rear back additions, erection of a replacement part four-storey (double height ground floor with three floors above) and part single storey rear extension; installation of a new Juliet balcony at first floor level to the rear elevation; internal alterations to include: lowering the floor level of the lower ground floor and upper ground floor to rear part of the building, extend the existing living/dining room to match the new rear extension at upper ground floor level, removal of wall between the proposed study areas at first floor level, increase opening between children's bedroom and lounge, remove modern partition between hallway and bedroom, remove and rebuild partition between en-suite bathroom and bedroom, and creation of new opening between landing and en-suite bathroom at second floor level, creation of new opening between bedroom and office, new opening to master bedroom and re-instatement of wall in master bedroom at third floor level, and formation of a new bathroom at fourth floor level; associated internal and external alterations.