In the two-calculation comparison mode, even with the use of BIM technology, the accuracy of project cost planning does not improve. This means that cost analysis remains imprecise within this model. In contrast, the three-calculation comparison cost management model differs significantly in its approach. It manages costs across three key stages: planning, design, and construction. This method offers more precise cost control and management than the two-calculation model. The BIM-based cost management model for three-calculation comparison is illustrated in Figure 1:
This cost management model leverages BIM models to extract and analyze volume data throughout the construction project. By processing this data, relevant cost information can be obtained, enabling more detailed and accurate cost analysis through visualization and model features. During the planning stage, BIM data allows project teams to budget and manage costs according to established cost management systems and procedures. Additionally, they can review building drawings, identify design issues, and optimize the BIM model accordingly. These improvements provide more precise data and insights for cost estimation.
In the design phase, target costs are developed based on the project’s bidding costs and current conditions. BIM models supply essential budget data and resource information, serving as the foundation for preparing target costs. A comprehensive approach is taken by integrating information from various sources to formulate accurate target cost data. Construction control then follows these targets, which are broken down by project phases and further divided into monthly targets to monitor progress closely. The use of BIM also helps correct and optimize construction drawings, providing more reliable data for target cost budgeting.
During construction, cost management becomes more complex due to the variety of expense information involved. The BIM model must be continuously updated and refined based on real-world conditions. This includes making timely adjustments to material consumption and other cost-related processes within the BIM framework. By refining the data in the BIM model, a trustworthy actual cost can be established. Through this three-calculation comparison model, companies can optimize cost management practices across different project stages for better financial control and efficiency.
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