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Early construction cost estimates provide a useful starting point for planning, but their accuracy can vary widely depending on the project’s scope, available information of BIM cost estimating services, and the estimator’s experience. At the earliest stages—such as conceptual or feasibility phases—estimates are often based on broad assumptions, historical data, and limited design details, which can lead to a margin of error ranging from 20% to 40%. As more information becomes available, including detailed drawings, material specifications, and site conditions, these estimates become significantly more precise.