Pre-fabricated domed skylight system

Embodiments of the present invention comprise pre-fabricated domed skylight panel assemblies for use within steel decking systems. The skylight within the pre-fabricated domed skylight panel assembly is domed. Extending from the width-wise ends of the domed portion are respective skylight end extension portions for overlapping with adjacent steel decking panels or for coupling within an aperture of a decking panel. Further, extending from the length-wise edges of the dome portion are skylight edges configured for connection to decking panel edges (e.g., male and female rail edges or panel edges) that are configured for connection to edges of adjacent decking panels. The pre-fabricated domed skylight panel assemblies provide the desired light into the building, structural support in the steel decking system, ease of shipping of the domed skylight panel assemblies, ease of installation of the domed skylight panel assemblies at the building site, and a water tight seal.