SIRCULAR intends to create digital tools, technological solutions and non-technical services for the decarbonisation of the built environment, as well as a ready-to-use methodology for assessing the circularity of a given building capable of evaluating the impact of the developed construction technologies in the demos. These features are intended to improve access to information on decarbonisation for end users who are not experts in these fields, as well as to provide professionals working in the construction sector with tools capable of easily evaluating and improving the circularity of this area. The SIRCULAR solutions will take a multidisciplinary approach, integrating technical, economic, and social approaches with a focus on social and policy innovation, delivering valuable information to policymakers and establishing a solid foundation for the promotion of developed decarbonisation methods. The project will also be distinguished by an overall people-centric approach that prioritizes the needs, ambitions, and well-being of individuals and communities as critical players in the decarbonization of the construction industry. SIRCULAR will prioritize active participation, inclusion, and ethical concerns to ensure that the project's achievements directly benefit society as a whole. The project will also make special efforts to engage the whole supply chain engaged in all phases of the building's life cycle, with the goal of increasing the circularity and sustainability of each of them. SIRCULAR plans to consider four national clusters to promote a circular and sustainable construction sector using a value chain approach. The clusters will focus on Estonia and Spain, followed by Germany and Greece. The clusters will involve construction companies, housing companies, universities, and local administrative entities, and will include buildings owned or occupied by fragile population groups, in line with the SIRCULAR just and affordable transition approach.