Water consumption in buildings is a significant contributor to global freshwater utilization, yet research on the consequences of water usage has been limited. This study aims to evaluate the environmental implications of life-cycle water consumption in a multi-family residential building located in Doha, Qatar, using a comprehensive life cycle assessment (LCA). The analysis of the building was conducted using Building Information Modelling (BIM) as the primary tool. The LCA results revealed substantial impacts during the raw water treatment phase in Doha, which is characterized by energy-intensive thermal desalination. The water usage phase accounted for nearly half of the total impact observed. Throughout the life cycle of the modeled building, the cumulative annual emission reached 59,440 kg of CO2. This research provides valuable insights for water authorities and the building research community, facilitating the development of more sustainable water usage policies tailored to specific regions or countries. By understanding the environmental ramifications of water consumption in buildings, policymakers can make informed decisions to reduce the ecological footprint associated with water usage. Overall, this study underscores the importance of considering the life-cycle perspective in assessing the environmental impact of water consumption in buildings. It emphasizes the need for sustainable water management practices and encourages the adoption of efficient technologies and policies to mitigate the environmental consequences of water usage in residential structures.