The report is in a format suitable for a prototype guide for architects and engineers use in slanting new building designs toward basement construction of shelters against 15 psi (free field) nuclear blast overpressure and stage of guides preparation, including three case studies. All were for closed rather than open shelter, the objective being to provide the prescribed protection level at an additional construction cost of no more than 6 dollar/sf of shelter space. The cost limitation was approximately met in the third case study, using a full basement, but could not be met in the first two case studies, using partial basements.