Topology optimization is the natural counterpart of additive manufacturing, many believes that the technology could revolutionize the way we manufacture our everyday products, changing the way we design and manufacture our products considering of how the process mimics the nature system of manufacturing and design, so-called the biomimicry design. However, the level of research for the application of the technology in the building industry is still far behind compared to other more advanced industry such as the aerospace or automotive. This research thesis explores the opportunities and the possibilities of using this relatively young technology in the building industry, by developing not only a new manufacturing process but also new design methodology for architecture projects. The objective of this research is to design a structural system for free-form envelope of building by utilizing the potential of additive manufacturing and using topology optimization as a design method to optimize the structural performance in comparison to the existing design and manufacturing process.