Abstract: Sri Lanka has an immense potential for renewable energy given its location near to the equator. Colombo, and a large part of the Western Province, experiences 2620 hours of annual sunlight (approximately 7 hours every day). Furthermore, being a seaside island, it also experiences a fair amount of strong sea breeze on both the west and the east coast. Thus, Green buildings, leveraging renewable energies, have a huge prospect in Sri Lanka. In the long term, green buildings have a deep economic benefit, with lower energy footprint and hence low costs.