Croatia leads on legal frameworks, Italy on digital tools, and Czechia on circular design principles, while Hungary bridges policy with practical implementation. The network is further strengthened by Poland’s work on market demand, Germany’s R&D in innovative materials, and Austria’s development of training programs. Slovakia adds a crucial layer by fostering industrial symbiosis for resource exchange. Seamlessly coordinated by the Slovenian hub, this interconnected structure is the key outcome of the ReBuilt partnership. It enables a targeted yet synergistic approach, ensuring that knowledge and solutions are co-created and shared across borders. This powerful network stands as a testament to what can be achieved through transnational cooperation, paving the way for a sustainable construction future in Central Europe.