NBSINFRA plans to establish five representative European regions, each with an equal number of “City Labs.” These labs will assess the cost-effectiveness of NBS in safeguarding local infrastructure and aim to maximize impact through solutions owned and co-created by citizens, end-users, managers, and civil society. NBSINFRA intends to provide a practical toolkit for various stakeholders and society as a whole, enabling them to compare and select the most effective NBS for protecting local critical infrastructures. The overarching goal is to support the enhancement of local urban critical infrastructure protection against threats through collaborative efforts in NBS design, monitoring, and creation, thereby fostering a sustainable and resilient society.