The development will consist of the demolition of existing (non-original) rear single storey over basement lean-to & subsequent construction of a new single storey over basement extension to rear. Proposed works will also include general restoration & decoration works, including refurbishment of existing windows & doors (to include slimline double glazing), replacement of non-original PVC front door at lower ground floor; front elevation windows to be restored to 6 over 6 at upper ground & first floor levels, 8 over 8 at lower ground level. Replacement of non-original PVC window & base at rear first floor. Removal of the rear kitchen window at upper ground floor to access new single storey glass link. Modifications to existing rear return at upper ground floor level including 2no. new opes to SE elevation, widening of existing window ope to SW elevation (window to be relocated) and partial removal of wall to NW elevation to allow for connection to new extension; new ope for double doors from entrance hall. Relocation of rear return SW sash window to new ope on NE elevation of rear return at first floor level; Modifications to existing rear return at lower ground floor level (basement) including new double doors opening to SE elevation; widening of existing window ope to SW elevation and enlargement of existing lightwell and partial removal of wall to NE elevation. Replacement of PVC window & door to courtyard with new painted hardwood windows. Internal layout modifications including 4no. new internal door opes at lower ground floor level for provisions of utility/ensuites & a new staircase to upper ground floor; 3 no. new internal door opes & removal of non-original partitions to upper ground floor; modification of main bathroom and new ensuite to rear return bedroom at first floor level. Calsitherm thermal insulation to the internal face of existing front and rear walls throughout. 2no. new conservation rooflights & new solar PV panels to rear existing roofs, 7no. new rooflights to proposed extension roofs. External modifications to include new escape stairs to rear courtyard; increase in height and new rear vehicular entrance both to existing rear boundary wall and all associated site works to existing 2-storey over basement terraced house.