A prefabricated structure comprises a shell including a shell frame and an extension deployable from the shell, the extension including an extension frame. The shell frame comprises a floor support, a roof support, and a plurality of columns extending between the floor support and the roof support. The extension frame comprises a floor support, a roof support, and a plurality of columns extending between the floor support and the roof support. The prefabricated structure further comprises a floor panel connected with the shell by a hinge to provide a floor for the extension, wherein the floor panel is undeployed when the extension is held in place within the shell by the extension, and wherein as the extension is deployed, the floor panel pivots at the hinge and the extension guides the floor panel to a deployed position.