There is disclosed an improved rooflight 100. A first aspect of the rooflight provides a perimeter lip 1401 which protects an edge of a pane 210 of glass from being accidentally chipped or cracked. A second aspect of the present invention provides a channel for a blind 1100, which channel is formed by two cooperating channel sections 1601, 1602. A third aspect of the present invention provides a flashing system 1700. Another aspect of the rooflight 100 provides a water deflector 450 for preventing rain water from impinging directly onto a weather seal between a casement 120 and baseplate 110. Another aspect provides removable linings 610, 620, 1210, 1220 which can be mounted an interior face of the casement 120 and/or baseplate 110. Another aspect provides a slot 1000, for securing flashing 800, 810, which extends around the perimeter of the baseplate 110. Another aspect provides a blind 110 which is recessed within cavities and a blind runner 1300, thus reducing unwanted transmission of light when the blind 1101 is pulled.