This study investigates the impact of window glazing, window-to-wall ratio (WWR), and shading on energy efficiency and lighting performance in a case study located in Budapest, Hungary. By utilizing DesignBuilder software for building performance simulation, the research explores various configurations involving triple and double glazing, with and without shading, across WWRs of 10% and 50%. The study evaluates heating, cooling, and lighting energy consumption, comparing the performance of each scenario to identify strategies that optimize both energy efficiency and occupant visual comfort. The findings reveal that triple glazing with automatic shading and a 10% WWR achieves efficient performance, minimizing electricity consumption through effective solar heat gain control and optimized daylighting. In contrast, higher WWRs without shading result in increased cooling demands, lowering overall energy efficiency despite enhanced daylight penetration. The results underscore the critical importance of integrating shading devices with appropriate window designs to mitigate solar heat gain and balancing thermal comfort with lighting needs.