Erection of a single storey rear extension at ground floor level, following the removal of existing conservatory at basement level; erection of a new side boundary wall (facing Studdridge Street) to the same height and matching brickwork as existing, following the demolition of existing side boundary wall; installation of 2no. rooflights in the front roofslope and 1no.rooflight in side roofslope; erection of 1no. dormer in the rear roofslope; replacement of all existing windows to the front, rear and side elevations with double glazed timber sash windows; installation of new glass doors and erection of rear garden steps at basement level to provide access to the garden, following the demolition of existing porch.