The Solar Decathlon is one of the largest university-based competitions bringing forth innovative and inspiring ideas for sustainable building and living. At the Solar Decathlon Europe 21/22 in Wuppertal, Germany, 16 teams of different nationalities exhibited their eco-friendly house concepts. The German team coLLab, from the University of Applied Sciences in Stuttgart, developed a modular extension project for a building on their campus and presented a 1:1 scale model consisting of 4 units. As the main element of their creation, the students imagine a kind of double skin covering both the extension and the existing building and which integrates ASCA® solar modules.