| dc.description.abstract | The quantity takeoff method using the BIM tool is proven to be faster and reliable than the traditional 2D-based method. However,
this is not an automatic process. Some data can be underestimated due to incomplete modeling, while some data can be overestimated due to
overlap modeling. The research objective is to propose BIM modeling guideline for enhancing the accuracy of architectural walls quantity Takeoff with
the case study of one story residence. REVIT 2019 was used in this study. BIM based quantity takeoff results with difference modeling method were compared
with manual quantity takeoff. The results showed that the ways to model the components (walls, structural columns, structural beams and floors) affected the
accuracy of BIM-based quantity takeoff. Inappropriate component modeling, such as no considering of object overlapping, and double count in a material takeoff
report can make the error about -23.46 to 30.65% in quantity takeoff, or -5.08 to 24.01%, or -4,188 to 19,787 Baht in cost estimation, comparing with
actual construction. While, the accuracy of BIM-based quantity takeoff came with appropriate component modeling, such as consistence wall height modeling
with real construction, using the join geometry command, and careful considering in a material takeoff report. Finally, the results showed that BIM-based quantity
takeoff with this BIM modeling guideline give the accuracy architectural wall quantity takeoff with only -2.12 to 4.70% error in quantity and 0.76% or 966 Baht
errors in cost estimation, comparing with 126,898 Baht of second manual quantity takeoff. While, first manual quantity takeoff had a mistake from incomplete
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