Abstract: A skylight assembly is provided that is adapted to be mounted to cover an opening in a roof structure. The assembly includes a liner adapted to be mounted adjacent the edge of the opening in the roof structure around the periphery to surround the opening and to form a wall extending upward from the roof structure. Flashing is mounted at the area of joinder between the liner and the roof structure. An outer dome and an inner dome are spaced from one another with the outer dome overlying the inner dome. Both of the domes engage a sealing gasket positioned on the upper end of the liner wall. A supporting frame is coupled to the dome and the sealing gasket arrangement and is hinged to the liner to permit shifting thereof with respect to the liner between a closed position overlying the opening in the roof structure and an open position permitting access to the opening from the exterior of the roof structure.