Michiel Ritzen leads the sustainability evaluation expertise center at VITO (Flemish Institute for Technological Research), while Carolin Spirinckx is a research leader within the group focused on the built environment. Together, they highlight how we can develop innovative designs and materials today that remain sustainable in the long term. They approach this from a multi-cyclical and circular perspective, with insights from leading European research projects such as Demo-BLog, Drastic, and DISCOVER.