Presentation and overview of 3C cluster (Circular materials and solutions for construction). This cluster is coordinated by Turku Science Park. The C3 Cluster is an activity within the CleanTurku spearhead at Turku Science Park Ltd. CleanTurku promotes the growth of companies in the fields of cleantech, circular economy and bioeconomy. The vision of the 3C cluster is to boost the transition of the companies and industry from linear to the circular economy through innovation and collaboration. The C3 Cluster brings together companies, universities, educational institutes and public players in the field of construction materials.