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(BIM-1348) Validating a Quantity Takeoff Generated by a Building Information Model

Primary Author: Ms Tamera L. McCuen

Audience Focus: Advanced
Application Type: Research
Venue: 2013 AACE International Annual Meeting, Washington, DC, USA

Abstract: Validating the quantity takeoff (QTO) is an important step in any cost estimating process however it may be even more important when the QTO was generated automatically from a building information model (BIM). Generating a QTO as an export from a BIM is as simple as ‘pushing the button’ or selecting the feature from a menu. Validating the BIM QTO for accuracy and completeness is proving to be more of a challenge. In the traditional process the cost estimator is responsible for each of the activities in the process from QTO generation through validation. Validating a QTO exported from a BIM is much different because the cost estimator receives the QTO as a dataset generated from a design model. In this paper the author reviews some of the current practices used by professional cost estimators in the construction industry. In addition to reviewing current practices, the author discusses next practices and makes some recommendations for validating a quantity takeoff generated by a BIM.