In tropical climates, façade design plays a crucial role in striking a balance between daylighting performance and thermal control, thereby enhancing energy efficiency and occupant comfort. This study explores the parametric relationship between facade envelope ratio and daylighting performance in high-rise office buildings, focusing on optimizing the Window-to-Wall Ratio (WWR) to meet both visual comfort and energy-saving goals. While façade aesthetics are often prioritized, the functional integration of passive design strategies remains underexplored, particularly about minimizing Envelope Thermal Transfer Value (ETTV) in tropical conditions. Using IESVE simulation software, the research evaluates various facade configurations to determine their impact on indoor illuminance levels and energy performance. Results show that a façade envelope ratio of 80–90% with a setback depth of 1.5 meters and a WWR of approximately 70% yields optimal daylight distribution, maintaining acceptable indoor illuminance levels between 230 lx and 300 lx. These configurations also contribute to lowering ETTV, aligning with sustainable design standards for tropical regions. The findings demonstrate that parametric facade design can effectively inform passive design strategies, guiding architects toward achieving enhanced daylighting, reduced thermal gain, and improved energy performance. This study proposes a performance-based design framework that leverages facade-envelope-to-window ratios to support sustainability goals in high-rise office buildings.

High-Rise Office, Parametric of Facade Envelope, Window to Wall Ratio, Thermal Performance