Demolition of existing internal stairs with new and adjustments to the stair core on the fourth floor. Replacement of lift with new to extend to the fourth floor. Modern partitions replaced with new to create meeting rooms, toilets, risers, and storage areas. New floors and ceiling finishes. Internal openings in communal areas to be enlarged to accommodate new doors. Replacement of the doors to the rear elevation and removal of existing modern window and wall section on first floor for new door to fire escape stair. Secondary glazing to rear elevation windows and external loading doors. The first floor glass roof to be removed and replaced with a solid roof. Changes to the approved rear fire escape stair and landings including extension to the First floor. Replacement of pavement lights. First-floor terrace plant enclosure extended to accommodate new plant. Adjustments to terraces on the first floor and roof. Replacement of the roof access dormer, new skylights and warm roof build-up with like for like finish. Making good of the existing external lighting and addition of external lighting to entrance, fire escape and terraces.

Demolition of existing outrigger structure at ground floor level, vertical extension of existing lower ground outrigger to ground and first floor. Introduction of a new door to the garden at the rear, widened steps up to garden level. Relocation of lower ground floor kitchen window to the new first floor rear extension. The existing rear stairwell window is also to be reinstated in the rear ground floor extension. Demolition of existing roof and erection of mansard extension, set back from front parapet. At the rear, mansard structure to be set back behind the existing and retained butterfly roof profile. Two dormer windows to the rear, two patio doors to the front. Internal changes include changes to the partitions at lower ground floor level, reinstatement of the original partition layout at ground floor and the removal of non-original arched alcove soffits at first floor.