A changed climate will expose European cities to environmental pressures. The SUDPLAN project - Sustainable Urban Development Planner for Climate Change Adaptation - aims at developing a web-based planning, prediction and training tool to support decisions in long term urban planning. This will help to assure population´s health, comfort, safety and life quality as well as sustainability of investments in utilities and infrastructures within a changing climate. With it´s open nature and architectural design, SUDPLAN will contribute to a shared information space in Europe.