Materials lose much of their value after they are used in buildings because there is usually no way to reuse them at the same level of quality. However, materials can be redesigned so buildings are assets instead of liabilities. Buildings are like banks but instead of banking money they bank materials. The quality of materials can be improved at every stage; planning, construction, maintenance, and for products that move through a building during operations and maintenance. The BAMB project is implementing the concept. Key is to improve the value of materials used in buildings, by engaging all stakeholders to enhance knowledge about design methods and specified products. This is achieved by developing and integrating two complementary value adding frameworks: materials passports and reversible building design. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 642384.