As climate change intensifies coastal hazards, hybrid nature-based infrastructure, such as dune dike systems, offers a promising pathway to enhance resilience while supporting ecological and social value. However, assessing the sustainability of these blue-grey solutions integrating engineered structures with dynamic, vegetated systems remains challenging due to the lack of tailored, quantifiable evaluation frameworks. This research focuses on operationalizing a rating system for blue-grey coastal infrastructure developed under the DuneFront project by translating qualitative sustainability criteria into measurable impact categories. The framework is demonstrated through its application to the Katwijk coastal protection project in the Netherlands, a hybrid dune-dike system, providing a practical case to test and validate the methodology. This work details the method for aligning project indicators, such as material sourcing, biodiversity integration, and design adaptability, with standardized impact metrics from life cycle assessment (LCA) and ecosystem evaluation protocols. The proposed approach enables a cross-scalar evaluation from cement material choice to ecosystem function, bridging laboratory innovation and real-world infrastructure implementation. It supports a comparative assessment of nature-based solutions across different sites and scenarios, aligning with emerging policy tools for sustainable activity. Integrating material innovation with system-level evaluation offers a reproducible framework for assessing and comparing nature-based coastal solutions, advancing performance-driven design and policy alignment in the field of regenerative infrastructure.