The preliminary stage of a residential real estate project is of great importance but also is known to be with poor efficiency. However, residential real estate project contains numerous built standard units such as dwelling units and floors. By introducing BIM, this research tapped the full potential of this advantage to improve the performance of the preliminary plan modeling in residential real estate projects. This research proposed a standard-unit-based modeling approach which contains 3 main steps: 1) standard unit management, 2) rapid plan modeling and 3) in-time estimation. By integrating functions such as intelligent standard unit boundary revision, sun analysis, multi-level and information-based model visualization, a prototype system was developed based on this approach, and was applied to a real estate project in Xian, China. The results indicate that this approach has the potential to improve the efficiency and quality of preliminary plan.
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