For the future of BIM collaboration, a close exchange of information between constructional and environmental issues is needed. The way there is via integration of the respective BIM construction models along with the respective data sets into the GIS model of the given environment. There are two technical approaches for this data integration. We present some examples from our real-life projects, showing how BIM-GIS integration and subsequent environmental assessments were carried out. Considerable non-automatic work is still needed. However, we clearly state added value for interdisciplinary cooperation as well as for a more adequate representation of environmental facts and hence for professional advances in landscape and urban planning.