Living Labs in Architecture constitute an innovative tool towards a holistic approach of teaching sustainability, using a real built environment for user-centred research and the creation of a collaborative learning platform at a university campus. LOW3 is the 2010 Solar Decathlon Europe solar house of UPC-Barcelona Tech, which since 2011 serves as Living Lab at the ETSAV campus at Sant Cugat. As a Net Zero Energy Building (NZEB), Living Lab LOW3 fosters active teaching, research and innovation activities in the field of sustainable architecture and life style. The growing participation of stakeholders, and first results of the related teaching and dissemination activities show that after 2 years the project has contributed significantly to a holistic sustainability education at UPC. Dissemination activities like open doors days and guided visits showed an interesting potential for education of the general public with special focus on the local community of Sant Cugat.