Our buildings have an enormous impact on the wordwide CO2 emissions, resource depletion and creation of waste, not only by the operational energy of buildings but also by the use of building materials. The transition to a circular and CO2 neutral economy asks drastical efforts to increase the environmental performance and circularity of our buildings (by re-using building materials, installation of geo- or biobased materials,  application of low-impact materials, creating smart renovation strategies, etc.)