Allied Steel Buildings manufactures and engineers prefabricated steel and metal structures for clients globally. The company specializes in pre-engineered buildings, hybrid steel solutions combining conventional and modular systems, and custom structures for industrial, commercial, warehouse, aviation, and mission-critical applications across 72+ countries., Allied Steel Buildings manufactures and engineers prefabricated steel and metal structures for clients globally. The company specializes in pre-engineered buildings, hybrid steel solutions combining conventional and modular systems, and custom structures for industrial, commercial, warehouse, aviation, and mission-critical applications across 72+ countries.