Design estimation refers to the process of predicting the construction costs of a project during the design phase. This task is typically carried out by the design team or cost consulting units, relying on preliminary design drawings and budgetary quotas. At this stage, the focus is on what is known as “post-graph cost.” Traditionally, engineering cost management has failed to effectively control costs during the design phase due to several key issues:
1) There is no effective link between the design estimate and the cost budget solution. Design budgets are primarily based on national or local budget quotas, which are updated very slowly and suffer from limitations such as outdated information, poor timeliness, limited comparability, and broad classification categories. These shortcomings make it difficult to keep up with rapid market changes, causing a disconnect between the design budget and actual project costs. As a result, designers cannot access real-time, detailed cost data for each design element during the design process. Relying solely on budget data makes true cost control at the design stage impossible.
2) The design drawings and data generated through 2D computer-aided drafting software during the design phase, along with their associated estimates, cannot be automatically linked to the data required for cost management. This lack of integration hinders the use of design data for cost management in later construction phases and prevents data sharing throughout the entire project lifecycle.
The Building Information Modeling (BIM) approach addresses these challenges by integrating engineering data such as 3D models, quantities, costs, prices, and business information into a unified platform. This integration significantly enhances the ability to control costs during both design and subsequent phases.
First, BIM-based design estimation enables real-time cost simulation and calculation, which can also support project management after the design phase. All parties involved in the construction process can collaborate during the design stage, making it easier and more efficient to predict project costs and schedules. This collaborative approach helps overcome issues such as professional silos during design and disconnected project phases, while reducing frequent design changes and the disconnect between design, cost control, and construction.
Second, BIM empowers architects and engineers to analyze and understand project performance digitally before construction begins. It allows for the development and evaluation of multiple design options, enabling architects and designers to make informed, sustainable design decisions through easy comparisons.
In summary, BIM-based management during the design phase effectively solves cost control challenges. Leveraging BIM’s computational capabilities, project quantities can be quickly analyzed. By integrating historical BIM data, cost analysis indicators provide faster and more accurate design estimates, greatly improving the precision of cost predictions during the design phase.
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