European cities face a pressing challenge to provide economic prosperity and social cohesion while achieving environmental sustainability. This has forced us to rethink how we do research. This has led to the ‘living labs’ concept. Living labs are not sterile and removed from daily life: in fact, living labs seek to design, test, and learn from social and technical innovation from real living spaces in real time. Living labs are a fantastic way of doing research because they reflect the realities lived by ordinary people. However, not enough has been done to understand how living labs work across national contexts, and how their successes can be scaled up to have an impact across Europe. Gust is a project which seeks to do exactly that. An important goal of this project is to learn about the impacts of urban living labs in a systematic way across urban and national contexts. GUST brings together leading European research partners and practitioners in order to investigate urban living labs and how they can be enhanced so that they can contribute towards sustainability transitions.