The present invention encompasses a process for initially combining and thereafter uniting two or more modular units to one another in order thus combined to be able to form a house body, for instance a cellar-adapted house body. A liquid-resistant layer is advantageously wholly or partly to be able to cover a base slab and in any event lower wall sections allocated to the wall portion, proximal the base slab, in order principally to prevent damp permeation. A first modular unit, with in any event a first open wall portion, is placed on a substrate prepared within a building site, a second modular unit, with in any event a second open wall portion, is placed on the substrate prepared within the building site, so that an open wall portion allocated to the first modular unit will connect to an open wall portion allocated to the second modular unit. The base slab of the one modular unit and the base slab of the second module form a free space defined by the mutually facing edges of the base slabs. The base slab of the one modular unit is connected, with the aid of a tractive force absorbing reinforcement, to the base slab of the second module over the free space and that the free space is filled with concrete or the like. The present invention also encompasses a house body thud produced.