Abstract: In building electrical design, load statistics has long been plagued by high labor input, low efficiency, error-prone processes, and poor traceability of results. To address these challenges, this study adopts a BIM-forward design approach and develops an automated solution through secondary development on the Revit platform. A special plug-in for embedded Revit environment is developed by calling Revit API through C # language. The plug-in has the functions of automatic extraction of building room parameters, intelligent generation of standard electrical space and partition, flexible configuration of load density index and dynamic management of statistical rules. The method is verified in a financial construction project with a construction area of about 14 000 m2. Results show that, compared to the traditional method relying on 2D CAD and spreadsheets, the proposed approach significantly improves design efficiency when dealing with frequent design changes. It also achieves traceability of statistical results and provides a structured data base for subsequent design stages. This research contributes to a paradigm shift in load statistics—from manual and approximate to automated and precise—and offers a reusable technical route for deeper integration of BIM technology in building electrical engineering.