One of the steps in reducing CO2 emissions during the construction of future buildings, is to create insight into the use of materials and products in the buildings. Bosman Bedrijven uses the Madaster platform to produce a materials and product database of 3D construction models, which is also known as a ‘materials passport’.As this passport includes the location and the release of products, they can be reused for designing and building new buildings. This could be direct reuse, reuse after overhaul or recycling. These steps prevent the use of virgin materials, and exhausting the existing materials reserves and the corresponding CO2 emissions. More and more clients are making use of the Madaster compulsory for new constructions. With this concept, Bosman Bedrijven won a VINCI Environment Award in the Circular Economy category.