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The Influence of Building Compactness on Energy Performance

Abstract

Building compactness is an important characteristic in architectural design because it influences the relationship between a building's enclosed volume and its external surface area. The form and degree of compactness of a building can affect heat transfer, solar exposure, ventilation, daylighting, and energy demand. As the construction sector increasingly emphasizes energy efficiency and sustainable building practices, understanding how building geometry influences energy performance has become increasingly important. Appropriate consideration of compactness during the early design stages can help reduce unnecessary energy consumption while maintaining functional and comfortable interior environments. This study examines the influence of building compactness on energy performance, focusing on how variations in building form, surface-to-volume ratio, floor arrangement, and overall geometry affect energy demand. It considers compact and less compact building configurations and evaluates their potential implications for heating, cooling, lighting, and ventilation requirements. The study also explores how compactness interacts with other architectural characteristics, including building orientation, envelope design, window-to-wall ratio, shading, and climatic conditions. A highly compact building generally has a smaller external surface area relative to its enclosed volume, which can reduce the area through which heat is transferred between the indoor and outdoor environments. This characteristic may contribute to lower thermal loads under certain climatic conditions. However, increased compactness can also influence daylight availability, natural ventilation, and access to external spaces. The relationship between compactness and energy performance is therefore not solely dependent on building size but also on the arrangement of spaces, openings, envelope materials, and environmental conditions. Climate is an important factor in determining the energy implications of building compactness. In warm climates, building forms that minimize excessive solar exposure while supporting effective shading and natural ventilation may help reduce cooling demand. In other climatic conditions, greater compactness may reduce unwanted heat loss through the building envelope. The study therefore considers the importance of developing climate-responsive forms rather than applying a single compactness strategy universally. Building orientation, roof configuration, façade design, and surrounding environmental conditions are also considered in evaluating overall performance. Several challenges may arise when compactness is prioritized in architectural design. Highly compact forms may restrict opportunities for courtyards, cross-ventilation, daylight penetration, outdoor connections, and flexible spatial arrangements. Conversely, highly articulated forms may increase envelope area and potentially increase thermal exchange and construction complexity. These competing considerations demonstrate the need to balance compactness with other passive design strategies. Energy performance should therefore be assessed holistically rather than treating compactness as an isolated design variable. The study aims to provide a clearer understanding of how building compactness influences energy performance and how this relationship can inform energy-efficient architectural design. The findings are expected to assist architects, building designers, engineers, and planners in evaluating building forms during the early design process. By integrating compactness analysis with orientation, envelope performance, daylighting, ventilation, shading, and climatic considerations, designers can develop building forms that achieve improved energy efficiency while maintaining functional and environmental quality.

Keywords: Building compactness, Energy performance, Building form, Surface-to-volume ratio, Energy efficiency, Building geometry, Thermal performance, Cooling demand, Building envelope, Passive design, Climate-responsive architecture, Solar exposure, Sustainable architecture, Energy-efficient buildings.