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November 29, 2017

MBEst A Technical Report on Standardization of Model-Based Estimating

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Project cost estimating is an important part of construction project management. Traditionally, estimators use project drawings and specifications to create quantity takeoffs (QTO) and subsequently calculate sub/total costs based on their judgments and historical cost information.During the past decade, BIM practitioners in academia and industry have aimed to leverage BIM capabilities for cost estimating to overcome the current challenges. The result is BIM-enabled methods for QTO and cost estimation also known as Model-Based Estimating (MBEst). However, the effectiveness of MBEst has been limited mainly due to a lack of standard MBEst workflows and a lack of integration between design development and cost estimating processes. In response, the intent of this technical report is to make a comprehensive review of model-based QTO/estimating and to provide a standard method for BIM experts to adopt and implement MBEst.