Circularity passports have been developed by the EU-funded BAMB (Buildings as Material Banks) project. They consist of datasets containing the characteristics of materials in building products with the purpose of generating value by mapping their recovery, reuse and recycling potential at different levels and making them available to the right parties at the right time. Circularity passports can be requested and used by a wide range of stakeholders, ranging from product manufacturers, through building (system) owners and users to dismantlers, urban miners and material suppliers. Different levels of information provide a safe way of sharing data across the entire construction value chain. Over the duration of the BAMB project, more than 300 materials passports for various products, components or materials were developed.