Abstract: In light of growing global concerns about climate change, reducing greenhouse gas emissions has become a critical focus. Taiwan has pledged to achieve net-zero emissions by the middle of the century, highlighting the construction sector's vital role in this effort. This study integrates Building Information Modeling (BIM) with Life Cycle Assessment (LCA) to develop effective strategies for reducing embodied carbon in building structures. Traditional LCA approaches face challenges due to inconsistent data sources, varied methodologies, and intensive labor requirements. By reviewing international carbon assessment standards, this research identifies a locally appropriate carbon database and builds an automated evaluation system using Autodesk Revit and Dynamo. The system enhances efficiency, reduces human error, and minimizes time and labor costs. A case study involving an activity center evaluates the carbon reduction potential of two commonly used structural materials in Taiwan—reinforced concrete and steel structures. The analysis also incorporates a carbon pricing mechanism, converting emissions reductions into economic terms for clearer decision-making. Results demonstrate the system’s effectiveness in rapidly assessing carbon performance and cost benefits, offering practical support for low-carbon material selection and policy planning in the early design phase.