This paper aims to develop a methodological approach for spatial decision support for the development of building-integrated photovoltaics (BIPV) in urban or dense areas, taking structure types and development types into account. By means of a high-resolution and area-wide modeling of the solar irradiation for the building stock of the city of Dresden, suitable areas for BIPV are identified. The city-by-city analysis based on a semantic 3D city model enables an evaluation of the solar irradiation potentials according to building categories and characteristics, thus allowing a comparison between the different city typological structures. Large, low-slope roof surfaces are particularly suitable. As the slope increases, the potential on roofs depends on their orientation. Height and orientation of facades have a stronger influence on their suitability than the building structure.