Replacement of existing roof access hatch with new opening glazed skylight and construction of a staircase to existing roof terrace and associated internal alterations; replacement of existing railings at roof level with new Building Regulation compliant railings works required to create a roof top amenity space; replacement of existing windows (3no. fourth floor and 1 no. third floor) with double glazed windows, refurbishment of front dormer window with introduction of new double glazed windows, sub-division of Third Floor bathroom to create a second bathroom and replacement of modern internal doors to residential apartment.