Abstract: A house includes a split-slab foundation having an upper portion constructed within an enclosed on-tract factory and a lower portion constructed on the lot. The superstructure of the house is erected upon the upper portion, and the super-structure and upper portion are transported off-highway by air-cushion transport to the lot where the slab upper portion is mated with the lower portion. The upper portion is uniquely constructed with areas of increased thickness to withstand the shear forces of parts of the house having substantial weight, with pipe passageways to accommodate pipes built into the lower portion, and with means for releaseably attaching an air impermeable skirt used for air cushion transport. The lower portion is uniquely constructed with recessed areas to accommodate the areas of the upper portion having increased thickness and the pipes therein are positioned to be in register with the passageways in the upper portion.