This work contains the technical report about the research in how to design and construct a demountable grandstand. The design itself is a modular structure which can be demounted and transported to different locations and to be reused multiple times. With the modular design any event organiser can decide what arrangement and capacity the structure has, and even decide which functions will be situated inside the building. Smaller and bigger stadium designs are hereby made possible. The research and design were made from an architectural point of view, with the main aims directed on reuse, functionality, materialisation, building technology, and aesthetics.