Smart windows are capable of varying their visible light transmittance (VLT) in response to changing environmentalconditions. The VLT variability of architectural windows is highly valuable because it enables indoor lighting and energy environmentsto align with external changes. However, challenges such as high installation costs and assurance of glass visibility have prompted theexploration of alternative solutions, including models incorporating partially applied smart windows., Prior research focused on usefuldaylight illuminance (UDI) analysis for south-facing office buildings, pointing out suitable areas for smart-window implementation toenhance lighting control. In this study, we broadened this scope by determining optimal smart-window application zones underchanging building orientation. Furthermore, we studied the correlation between building orientation and smart-window deployment areas.