Water scarcity has become one of the most pressing global challenges. Climate change is exacerbating this stress, especially in very sensitive areas, such as mountain environment. In this framework, human activities are play an important role in adding anthropic pressure and instability, due to resident depopulation coupled with overtourism phenomena. In this framework, Nature-based Solutions (NBS) can provide multiple benefits in terms of resource management and biodiversity preservation. This thesis aims to develop a customizable design for a stand-alone living wall for greywater (i.e. domestic wastewater excluding toilet flush) treatment purposes. The designed structure integrates with the built environment and meet both architectural and ecological requirements.