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Prediction of the behavior of structures with rigid diaphragms is relatively easy compared to that of the structures with non-rigid diaphragms. When the diaphragms do not deform appreciably, horizontal forces are distributed to the lateral load resisting elements in direct proportion to their relative rigidities. On the other hand in building structures with flexible diaphragms, the distribution of horizontal forces to the lateral load resisting elements can depend significantly on the rigidity of the diaphragms. Objective of this paper is the development of simplified multiple-degree-of-freedom (MDOF) models that can be used for structural assessment of low-rise buildings with non-rigid floor/roof diaphragms. One wall and one diaphragm element are developed for the suggested simplified MDOF approach: These elements can be applied generally to various types of low-rise shear wall buildings. The number of degree of freedom in the simplified analysis approach is kept small while still permitting capture of the three-dimensional effects.