Precast buildings consist of floors, roofs, walls, beams, columns, and stairs that are manufactured in a controlled environment and transported to the construction site for erection. Precast construction has advantages related to design, economics, and quality. It allows for increased structural spans, architecturally aesthetic designs, and precise surface treatments. Costs and schedules are fixed prior to construction, waste is reduced through automation and recycling, and early commissioning provides returns for the client. High quality is ensured by prefabrication independent of weather conditions and strict quality control procedures.