What is building orientation and energy efficiency?

Building orientation refers to the positioning of a building on its site relative to the sun, wind, and surrounding environment and it has a profound impact on energy efficiency, thermal comfort, and natural ventilation.

How Orientation Affects Energy Efficiency

• Solar Heat Gain: South-facing facades (in the Northern Hemisphere) receive maximum winter sun. In India (tropical climate), minimising east and west-facing glazing reduces unwanted heat gain
• Natural Ventilation: Aligning openings with prevailing wind directions promotes cross-ventilation, cooling buildings without air conditioning
• Shadow and Shading: Strategic placement creates self-shading or allows adjacent structures to provide shade

Best Practices in Indian Climate

• Orient the building's long axis east-west to minimise direct sun exposure on larger facades
• Use deep overhangs, chajjas, or louvres on south-facing facades
• Minimise west-facing glazing, which receives harsh afternoon sun
• Orient living and working spaces to capture cooling breezes

Building orientation is a zero-cost design decision that pays lifelong dividends in energy savings and comfort.