Automated Quantity Takeoff and Life-Cycle Costing in Construction Projects Using an OpenBIM–IFC Approach

Abstract: BIM-based cost estimation often relies on proprietary solutions and ad-hoc mappings to external cost databases, limiting interoperability and auditability. This paper presents an openBIM workflow that enriches material definitions with standardized Canadian-specific cost items and automatically generates element-level quantity takeoff and capital cost breakdowns. A case study demonstrates automated cost extraction with material, labor, and equipment components, plus structured inputs for a maintenance-and-replacement-oriented life-cycle cost view. The approach automatically enriches BIM models with cost information, links quantities to standardized cost data, and provides life-cycle cost estimates in accordance with the openBIM interoperability standard.