Demolition of existing single storey rear extension and external staircase to Number 21 Arkwright Road and the erection of a new three storey (plus basement) rear extension to house new stairs and lifts. Provision of second floor windows in the front elevations of both Number 19 and 21 Arkwright Road. Alterations to the location and size of the vehicular/pedestrian access to the combined properties and revisions to the parking.