On 25 August, key stakeholders of the construction and demolition sector met with government officials and researchers. This time the aim was to get to grips with key questions and challenges of urban mining for the building and demolition sector. They further aimed to identify research questions that could be taken up in the following labs and possible trial projects. The challenges were manifold: from mere technical and logistic issues, to legal and financial brain twisters and a call for new and different business models.