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http://dx.doi.org/10.13161/kibim.2017.7.2.016

Improvement of BoQ Documents for the BIM based Quantity Takeoff  

An, Ji-Won (경상대학교 건축공학과)
Yun, Seok-heon (경상대학교 건축공학과)
Publication Information
Journal of KIBIM / v.7, no.2, 2017 , pp. 16-24 More about this Journal
Abstract
It is very important to estimate accurate construction total cost needed early in the project. In the initial phase of the design, the project cost estimates are determined by total quantity from design documents and the variables that affect the calculation of the total cost of the project. In order to determine accurate total construction cost, the contractor has to produce detailed quantity information based on the drawings and specifications. The process of preparing quantification and cost estimation documents is still being worked out manually, and a lot of errors have been occurred in many cases. Recent advances in information technology have led to the BIM based quantity takeoff and cost estimation. However, there are some limits to the extent to which the current specifications for BoQ documents are computed from BIM model. This research analyze the current BoQ cases and analyze how to make quantity takeoff possible through BIM. The study defined five levels of quantity category that could be produced by BIM. Only about 40% or indirectly usable items can be used when information is extracted to BIM modelling. This is very insufficient to fill out the BoQ. The BoQ document structure quantity takeoff specifications should be simplified in order to BIM based cost estimation more efficiently.
Keywords
Preliminary Cost Estimation; Building information modeling (BIM); Bill of Quantity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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