A prefabricated skylight and curb assembly and method for installing and fabricating same is disclosed. The skylight and curb assembly of the present invention may include a roof curb, a skylight, and a locking cap. The roof curb may define an outer perimeter and an inner open perimeter. Further, the roof curb may include a lower end for securing to a roof structure and an upper end for rigidly securing the skylight. The locking cap may include a retainer and a cover. The retainer may be disposed on the outer perimeter of the roof curb between the upper and lower ends. The cover may be adjustably secured to the retainer so that the cover may be moveable between a generally vertical position and a generally horizontal position.