Concrete paraboloid shell roof houses are being built in Oklahoma giving a lifetime home more living space for the money, great variety and flexibility of design, complete freedom of interior arrangement, lower heating and cooling cost, and minimum investment for maintenance and insurance. The architect, Duane Connor, points to time, labor and materials saved in the site placed concrete house, to the trades eliminated and to the cost per square foot which remains the same as span increases as all being good economic factors for keeping costs down.