This paper explores the application of computational techniques in problem solving. Specifically, it examines the use of a software add-on in the realm of space layout planning, to enable customization in the housing industry. The paper first proposes a comprehensive system to enable mass customization of housing, based on analysis of diverse research precedents, in addition to current industry applications. Then, a generative design model is proposed for the problem of space layout design. The model derives its logic from the concept of physical simulation and then implemented through a computer application that enables easy exploration and visualization of solutions. This paper represents a phase from an ongoing research endeavor to enable efficient customization in the housing industry through employing computational methods in design and production.