In Plain English
Quick Answer
A digital 3D model of a building that contains detailed information used for designing, building, and managing the structure.
Definition
Definition
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.
Context
Why It Matters in Bidding
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.
Example
Example
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.
See Also
Related Terms
FAQ
Questions Contractors Ask
How does BIM affect a construction bid price?
BIM-driven takeoffs sharpen quantity accuracy, which tightens contingency on materials. It also adds modeling, coordination, and software labor that the estimator must price explicitly. On BIM-mandated jobs, expect those coordination hours and licensing costs to appear as distinct line items rather than buried in general conditions.
Can estimators trust quantities pulled from a BIM model for bidding?
Only after verifying the model's level of development. Early-stage models may carry placeholder geometry or missing systems, so quantities can be incomplete. Estimators should cross-check model takeoffs against drawings and specs, confirm what scope the model actually covers, and apply judgment before committing those numbers to a competitive bid.
Is BIM required to submit a construction bid?
Not generally. Many projects still bid from 2D drawings and specs. However, owners and public agencies increasingly require BIM deliverables on large or complex jobs, spelling out the obligation in the contract documents. When mandated, contractors must demonstrate BIM capability or the bid risks being deemed nonresponsive.
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