A modular housing unit is fabricated from an intermodal cargo container. The rectangular box comprising the cargo container is cut into three sections. A right triangular section is fabricated from a center portion. The remaining portion is folded to form a “L”-shaped structure. The triangular section is reinserted into the vertex of the “L” to form a substantially triangular housing unit. A door is cut therein to provide means for entering the building. Intermodal cargo containers ranging from 20-53 feet in length can thus be employed to provide up to 424 square feet of living space.