The building sector is responsible for more than 60% of the resource use in Europe with more than 30-50 % of material use taking place in the housing construction sector. The sector also generates about one third of all waste in the EU. Thus, increasing resource efficiency in the housing sector is of great importance for a sustainable society. Currently, the trend is to improve recycling of building materials from demolition waste. This often leads to downcycling in the shape of reducing the use value of materials (e.g. concrete from buildings being converted to aggregate for foundations of roads). A circular economy promotes optimal reuse of building materials at at least an equivalent value (e.g. bricks reused as bricks). CHARM develops and implements an asset management approach that prevents downcycling of materials in renovation and construction of social rented dwellings by creating: - circular building strategies tested in demonstration examplers; - guidelines for a circular procurement strategy for social housing organisations; - material exchange platforms to enable circular flows of materials and building components in the social rented sector. The project output will be jointly generated by social housing organisations from 4 countries in the InterregNWE region (Belgium, France, the Netherlands, United Kingdom), in co-creation with supply chain partners and knowledge institutes. The housing organisations are front runners in different aspects that are crucial to circular asset management strategies. The CHARM building strategies lead to 36% of materials being prevented from downcycling, compared to the current maximum of 10%, being equivalent to 40.000 tonnes annual material recovery by the project partners alone. Dissemination and uptake of the results in the social rented sector in the NWE region will be achieved through the involvement of European as well as national innovation exchange platforms.