Water scarcity is a growing concern, with over 40% of the world’s population living in areas where water demand exceeds supply. Cities must adopt sustainable practices to ensure resource availability for future generations. Achieving water neutrality, where water demand is balanced by water savings, has become a critical objective for urban areas facing population growth and environmental pressures. While numerous methods exist to achieve this balance, from advanced water recycling to greywater systems, residential buildings remain a crucial starting point. This thesis focuses on two key strategies: Rainwater Harvesting Systems (RWH) and the use of water-efficient appliances in existing buildings. The thesis adopts a systematic approach to evaluate how RWH and efficient appliances can contribute to water savings in Turin's residential sector.