Green building aims to reduce environmental impact and improve occupant health. It incorporates features like energy and water efficiency, better materials, waste management, and indoor air quality. Converting an existing building to green involves adopting green practices during renovation like renewable energy, non-potable water usage, and low-VOC materials. Imperial Heritage is analyzing cost-effective green upgrades like fly ash bricks, double glazing, and rooftop gardens. Certification provides recognition and long-term cost savings through reduced utility bills and maintenance needs.