The RE4 project has been honoured with the Hans Sauer Award 2020 in the category "Tools | Materials | Methods"! This category honours tools, materials or methods which bringcircularity to the built environment: Circular materials and techniques which deal with existing constructions and / or structures and improve processes with smaller scaled hacks and innovations. The jury chose RE4, together with six other winners in three categories, from over 70 submissions from Germany and the Netherlands.