A digital 3D model of a building that contains detailed information used for designing, building, and managing the structure.
Building Information Modeling is a digital process and technology platform in which a three-dimensional, data-rich model of a building is created and shared among project team members throughout design, construction, and operations. BIM models contain not just geometric information but also data about materials, costs, schedules, and systems, enabling clash detection, quantity takeoffs, and coordination among disciplines. BIM use is increasingly required by owners and mandated by government agencies on large projects.
BIM lets estimators pull model-based quantity takeoffs directly from the design, cutting manual measuring time and reducing the errors that lead to mispriced bids. When an owner mandates BIM, it also signals coordination expectations that affect a GC's labor and software costs, so estimators must price the modeling and clash-detection effort into the bid rather than treating it as overhead.
Before bidding a hospital expansion, the GC's estimator imports the architect's BIM model into takeoff software to extract concrete and steel quantities, then flags a duct-versus-beam clash that would have cost roughly $40,000 in field rework if priced as designed.
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