Abstract: A pre-assembled skylight frame module and system is provided. A module includes opposed first and second skylight mounts, each including opposed rafters and opposed purlins to define a rectangular aperture between them. The skylight frame module includes an obtuse angle between the two attached first and second skylight mounts. The skylight mounts are adapted for receipt of pre-assembled skylight assemblies. The skylight frame module is configured for side-by-side attachment to adjacent such skylight frame modules, to provide a skylight frame assembly. The skylight system may be adapted to a variety of skylight openings by varying the rafter and purlin lengths and the angle between the connected skylight mounts.