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Many conventional estimating techniques, which rely on two-dimensional drawing measurements, have substantial potential for ambiguity, inefficiency and error. A three-dimensional project model removes the ambiguity and potential inconsistencies in project quantity estimations.
The fifth dimension (5D) is cost, which is brought into the virtual building life cycle.
A 5D estimate is a BIM linked to construction cost estimation through material quantities that are automatically generated from the data within the model. 5D Estimation improves budgeting, provides cost loaded schedules, and multiple interactive forecasts to make agile comparisons. Additionally, when the design is changed, the impact in costs can be calculated in real time, enabling general contractors to help the owner improve design and value-engineering decisions.