In Europe, the existing building stock has been constructed according to design criteria that are now obsolete, often resulting in poor seismic performance and energy efficiency. Combined retrofit solutions are more effective than uncoupled ones, since they can improve both performance and efficiency in a coupled manner. Nevertheless, the assessment of seismic and energy performance occurs separately in most cases, highlighting the need for a more integrated approach. BIM based approaches support this integration due to interoperable disciplinary models (architectural, structural, MEP) running in different simulation environments (calculation, modeling, and management). Therefore, a method is proposed for the concurrent assessment of the energy and structural performance of a building. It is divided in four phases: data collection, model development, performance analysis and outcomes interpretation. This method was developed applying a unified approach: a single BIM model was built in Autodesk Revit, and structural and energy simulation models were derived from it. The structural analysis was conducted in Autodesk Robot and the energy one in ACCA TerMus. Based on the analyses, the results were interpreted in an integrated perspective, by adopting the energy and seismic performance classes proposed by the Italian regulation. Finally, different combined retrofit solutions are proposed, coherently with the structural vulnerabilities and energy inefficiencies identified in the assessment phase. The application to a case study of a reinforced concrete school building, located in the municipality of Padua (Veneto, Italy) is herein presented.