Abstract：
The water-saving index of “water resource utilization” in green building design determines the incremental cost of construction. This paper analyzed the structure and assessment standard for water-saving incremental cost in green residential building; proposed the direct incremental cost formula for the design phase; defined various concepts, such as water-saving index cost coefficient, scoring efficiency and cost characteristics, etc. The incremental cost formula was used to calculate and analyze the incremental cost in water-saving design of several engineering cases, and relevant conclusion was reached.
