The BIM-based construction cost control process involves establishing a BIM team led by the project manager. From the construction preparation stage through to project completion and settlement, BIM technology and data are used to manage and control project costs based on the construction workflow and BIM application points. The detailed process is outlined below:
1. Selecting the BIM Platform. Choose a BIM platform suitable for the construction phase—one that integrates multiple disciplines, emphasizes data, and prioritizes practical application. Currently, platforms are mainly categorized into design-focused BIM platforms like Revit, and domestic software platforms such as Luban. The following steps use the Luban BIM platform as an example.
2. Establishing the BIM Model. Begin by clarifying the model type: either a budget model or a construction model. A budget model is created based on finalized drawings reviewed and approved by the design institute, officially submitted to the construction team. These drawings are more developed than tender drawings and generally have minimal changes unless special circumstances arise. Therefore, models based on these drawings provide valuable engineering quantity data and construction guidance. Construction models are updated versions reflecting actual on-site changes. Once the model type is determined, develop modeling standards and inspection criteria to complete the model creation. After building the model, thoroughly check it and upload it if it meets requirements. If issues are found, revise the model accordingly before uploading it to the platform.
3. Preemptive Corrections. Utilize BIM technology to address potential cost-impacting issues early on, such as clash detection, net height verification, and site layout planning. This proactive approach reduces rework and saves costs. Ideally, these corrections should be made during the construction preparation phase—specifically during excavation. At this stage, the project team structure is generally complete, the workload is manageable, and there is sufficient time and personnel to identify drawing issues and optimize site layout, thereby avoiding rework and unnecessary transport.
4. Preparing the Cost Plan and Defining Cost Targets. Establish both overall and sub-target costs. Once the cost targets are set, corresponding schedule targets and plans should be developed to align with these goals.
5. Ongoing Corrections During Construction. This involves two key aspects: identifying problems as they arise through a problem detection and resolution system, and linking quantity and cost data to model components via the completed BIM model. This creates a dynamic 5D time-and-cost plan curve within the Management Client (MC). Regularly compare on-site material quantities with planned amounts to determine if discrepancies are due to progress delays or management oversights. Similarly, compare planned versus actual costs over specific periods to detect deviations. If discrepancies occur, investigate the causes and apply timely corrections. If corrections are not feasible, revise the project goals accordingly.
6. Recording Cost Data and Conducting Dynamic Feedback Loops. Continuously document cost data and implement iterative processes to refine cost control throughout the project lifecycle.
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