The increase in world’s population, rapidly social and economic developments and environmental changes are some of the most significant reasons that are leading to water crises. Governments have encouraged appropriate strategy for sustainable water management especially for building since buildings are responsible for 13% of water consumption. Therefore, designing and constructing water efficient buildings gained importance recently. This paper aims to explore the latest methods for improving water sustainability in buildings and show the benefits via case study. Recent successful experiences indicate that green buildings can reduce water consumption up to 40 % as proved in the case study.  Keywords: innovative wastewater technology, sustainable building design, water conservation.