Abstract: This invention relates to a modular element for prefabricated buildings, and to buildings constructed using said elements. The modular element according to the invention is of L configuration, one leg of which being designed to constitute a wall portion having a height of one storey, and the other leg of which is designed to form a floor portion or a roof portion of the last storey. In the building according to the invention, the several L elements are disposed perpendicular to other L elements when viewed in plan, the ones being connected to the others by toothed bearings.