Abstract
Recently, Buildings have been ordered larger, more complicated, and free form design. So the adoption of BIM technology is in creasing the demand for large and complex construction of information for efficient management and utilization. Properties of BI M model can be used to automatically calculate quantities information in estimates field. This characteristic is expected to have a significant effect for the accuracy and reliability of the construction Cost estimates. This research is to develop a data model for Open BIM-based estimates to ensure accuracy and reliability, and improve interoperability of information. So studies of the overv iew of BIM-based QTO and estimates were researched. Also domestic and foreign BIM-based QTO and estimates case research were analyzed to draw out the implications to find a solution to the problems. Necessary properties requirements were drawn out by analyzing IDM and IFC spec was drawn out by analyzing MVD. Through these a method for Open BIM-based estimates wa s proposed. Also, to increase the application of the construction information classification system, domestic and foreign application of construction information classification systems were researched and analyzed. From the domestic research utilization the constr uction type classification of Public Procurement Service was selected as the most effective classification system and was applied. In addition "Code Generator" was developed and Pilot test model was applied to verify the data model and the availability of req uirements was reviewed. With the variety of construction information classification systems that exist in the domestic constructio n industry, the method from this research can be applied into the domestic practical field.