The project creates a test arena where public organizations, academia and companies can collaborate in the development, testing and implementation of new processes and organizational solutions for circular construction and reuse of building materials. It will contribute to solutions that promote the transition of industry to a circular economy in the construction and real estate sector. In Sweden, the sector accounts for about 30% of Sweden's total waste and 20% of domestic carbon dioxide emissions. The goal is to prevent and reduce waste and to reduce the environmental and climate impact by creating local and regional forms of cooperation for increased reuse of building materials. The project will show solutions and activities that lead to both reducing resource extraction and the use of natural resources. The desired end state is increased competitiveness and reduced environmental impact in Jämtland County. Through the development, testing and demonstration of new business models, we support the transition to a circular economy.