Building with earthy materials requires new methods to generate architectural geometry and possibly buildings. Topology optimization is a process often used in mechanical engineering and minimizes the volume while still keeping the maximum stiffness. This research implements this process into architectural models, in order to find geometry based on supports, forces and voids. This implementation can only be made by density dependent forces, which are important in architectural models. Self weight, snow loads and roofing constraints are added in order to make more relieable calculations. To generate architectural geometry the methodology is translated to 3D geometry and several design problems are tested. These problems show generated domes, arches and the proper transferring of forces to foundations. Insights from these design problems show that topology optimization can be used to generate geometries for masonry buildings.