apparatus for constructing modular buildings in which a reuseable framing structure is expanded to a shape desired of a building , building material is removably attached to the framing structure , fluent concrete is introduced to the building material , the framing structure is retracted with the building and removed . the framing structure has means for expanding its height and width . it also has means for changing the slope of its roof portion as well as changing the angles of its sides . thus , many different shaped building can be constructed with the same framing structure .