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Assessment of the Relationship Between Room Depth and Daylight Penetration in Office Buildings

Abstract

Daylight is an important component of office building design because adequate natural illumination can improve visual comfort, occupant wellbeing, productivity, and energy efficiency. However, the penetration of daylight into an interior space is strongly influenced by room depth. As the distance from a window increases, the availability and intensity of natural light generally change, potentially creating differences in illumination between perimeter and deeper areas of office spaces. Understanding the relationship between room depth and daylight penetration is therefore essential for designing office environments that make effective use of natural lighting. This study assesses the relationship between room depth and daylight penetration in office buildings by examining variations in natural illumination at different distances from external openings. The assessment considers room dimensions, window position, window size, window-to-wall ratio, ceiling height, and façade orientation. Daylight levels at different points within office spaces are examined to determine how increasing room depth affects the availability and distribution of useful natural light. Particular attention is given to the influence of window configuration and room geometry on daylight penetration. Shallow office spaces may allow daylight to reach a greater proportion of the occupied floor area, while deeper spaces may experience reduced illumination away from external windows. The study therefore examines how room depth interacts with window height, glazing area, window placement, and ceiling configuration to influence daylight distribution. The effect of external obstructions and surrounding buildings is also considered where relevant. Interior surface characteristics can further influence the distribution of daylight within office spaces. Wall, ceiling, and floor reflectance can help redirect natural light toward areas that are located farther from windows, while dark or highly absorptive finishes may reduce effective daylight penetration. The study therefore considers material reflectance alongside room depth and window characteristics to provide a broader understanding of factors affecting indoor daylight quality. Insufficient daylight in deeper office areas may increase dependence on artificial lighting and contribute to uneven visual conditions across workspaces. At the same time, excessive daylight near windows can create glare and unwanted solar heat gain, particularly where large glazed areas are used. Effective office design therefore requires a balance between adequate daylight penetration, visual comfort, solar control, and thermal performance. Understanding the relationship between room depth and daylight can support more effective spatial planning and daylighting strategies. The study aims to establish how room depth influences daylight penetration in office buildings and identify architectural strategies for improving the distribution of natural light. The findings are expected to support decisions concerning appropriate room proportions, window dimensions, façade design, interior finishes, and daylighting systems. The research can contribute to office environments that achieve more balanced daylight conditions, improved visual comfort, reduced artificial lighting demand, and enhanced overall environmental performance.

Keywords: Room depth, Daylight penetration, Office buildings, Natural lighting, Daylight distribution, Visual comfort, Window design, Window-to-wall ratio, Interior reflectance, Glazing, Solar exposure, Spatial configuration, Energy efficiency, Sustainable office design.