Abstract: A prefabricated housing unit designed to be placed on top of ground bases 42. The housing unit 10 has a housing shell 13 having longitudinal and transverse lower edges and a foundation structure 12 incorporated into and underlying the housing shell 13. The foundation structure 12 of the present invention has longitudinal beams 14 that span the entire length of the housing shell edges, and transverse beams 16 that join with the longitudinal beams at the corners. The corner junction is a load bearing point, while the remainder of the longitudinal beams remain substantially unsupported above the ground between the load bearing points.