Abstract: A habitable shelter/container with an extendable inner space, characterized in that it comprises unfolding lateral extensions, corner uprights (7) incorporating a retractable prop (51) for lateral extension, support and lifting, and a bottom structure or base-frame (11) provided on its undersurface with bearing and guide means for moving it on a surface or bearing track on a transport vehicle. The invention is of interest to builders of shelters for industrial use and for use as dwellings, for example, building-sites, camps and living quarters.