Abstract: A concrete cell, for the construction of buildings, made from two components, one consisting of the walls and roof and the other consisting of a floor which may be of any suitable material the principal characteristic of the cell being that the roof and wall component is made of very thin concrete between 1/4 inch and 2 inches, and that the roof of the cell is formed as a thin shell dome or cylindrical shell sprung from the tops of the walls to provide rigidity to the thin structure. The concrete is preferably reinforced, for example, with steel. Cells may be assembled together to form single or multi-story buildings in which the cell will generally be a non load bearing structural entity constituting a capsule to protect its contents and being arranged in an encompassing structure.