Structural steel erection involves erecting small clear spans and endwall frames in units as well as the larger clear spans and modular frames in sections. The erection methods used depends on the type of building, the available equipment, the experience level of the crews, and the individual job conditions. Structural erection service involves the assembly and installation of structural components to create buildings, bridges, industrial facilities, and other structures. This service typically includes the skilled labor, equipment, tools, and expertise needed to safely and accurately erect the framework of a structure based on architectural and engineering plans.