A prototype system is developed based on Autodesk Revit through Revit Application Programming Interface. As a result, the explicitly extracted quantities are converted by the preloaded formulas to the required format for the purpose of ordering and purchasing. Besides this, the unique classification information, along with formulas for derivedquantities, is front-loaded into the Excel Sheet database. The main concept is to pre-load the unique classification information into the BIM model such that the quantity of materials in a given BIM model can be extracted and stored into a database (Excel Sheet) automatically in according with the preloaded classification system. This study thus exploits a methodology which allows construction practitioners to obtain quantity takeoff in an automatic manner. This is partially due to the fact that incorporating cost breakdown structure formulated according to industry companies’ classification system into BIM still remains a challenge. However, this process in current practice involves massive manual interventions, which is extremely time consuming and highly error-prone. Quantity takeoff, serving as a foundation for the downstream tasks in the construction management, is a repetitive work.
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