a) demolition of existing single-storey annex extension to front and side of dwelling and demolition of existing part single storey and part 2-storey annex extension to rear; b) construction of new single-storey extension to rear; c) internal wall alterations and elevational changes to existing elevations; d) construction of new dormer window to rear elevation, replacement of existing rooflights to front and construction of new rooflight to rear of existing roof; e) all associated site works; all to existing 3-storey house