Abstract: A building construction employing elongated inverted L-shaped elements AB and partial elongated inverted L-shaped elements B. The building elements are juxtapositioned, in contact, laterally and end-wise and are stacked with the vertical legs of the elements substantially aligned, to form multi-story buildings. The vertical legs are substantially panel form bearing wall components B and the horizontal legs are substantially panel form floor-ceiling components A. Partition wall components C, perimeter wall components D or a number of other components or parts may be included in the construction. Extensive voids are included in the components. Components are fabricated of relatively light weight parts that can be economically handled by hand and fabricated employing hand tools.