Fiber‑reinforced strengthening systems, whether based on fiber‑reinforced polymer (FRP) composites or on fabric‑reinforced cementitious matrices (FRCM/TRM), are widely adopted to enhance the load‑carrying capacity and ductility of concrete and masonry elements. Within the SAFER‑REBUILT project (“Sustainable Approaches for Earthquake‑Resistant Rehabilitation Solutions for the Built Environment”), funded by the University of Bari Aldo Moro, this paper presents preliminary experimental and numerical results on bond deterioration and the sustainable recycling of FRP applied to masonry and concrete specimens. The experimental program and accompanying finite‑element analyses investigate the cyclic bond behavior and assess an innovative bio‑leaching and anaerobic‑digestion process for eco‑efficient recycling of strengthening systems once they are removed at end‑of‑life.