Porta-King has been in the portable building industry since 1969. Our products have been used around the globe for over 50 years! Porta-King Building Systems is a leading manufacturer of structural mezzanines, which are IBC 2003 compliant. We are willing to adapt to the changing times and produce just what you need. Your custom mezzanine will be designed and built for your intended usage—catwalk, elevated in-plant modular structure, guard tower or storage platform. Your initial contact gets us started.