Portable Offices Portable offices offer the ultimate in flexibility for plant floor operations. These units arrive fully assembled including an integral floor structure, virtually eliminating down time for installation. This includes not only the walls, roof and floor, but can also include electric, HVAC, plumbing or fire suppression. Unlike other modular "trailer type" units, who offer limited design flexiblity, each Porta-King portable office is custom designed to meet the exact floor plan requirments for the application. Larger portable offices available. Depending on the size of the structure, we'll divide up the space into modules that are easily connected together on-site. Again, this can include electric, HVAC, plumbing or fire suppression.