This Social Design project aims to improve the performance and ergonomics of the Banco de Bens Doados—in short BBD (can be translated as Bank of Donated Goods)—by proposing new wayfinding and taxonomy systems, which together optimize the user experience and reduce errors. This study used a systematic method to assess the current state of the institution, the wayfinding signage and the needs of users, including staff and volunteers. The analysis revealed several challenges resulting from inadequate signage, unclear paths and a lack of consistency, which impacted the efficiency of the space, task identification and organization. In response, the project proposes a new signage system, which incorporates clear visual cues, standardized colour coding, and intuitive symbols. We conclude that the new system developed competes to improve the efficiency of the institution and increases staff and volunteer intuitiveness and ease in the studied aspects related to the usage of space, workflow and individual and group performance.