The well known countries are facing adverse energy catastrophe that directly affects their economic condition. Day by day there is also boost in carbon emission which needs to reduce as early as possible. Retrofitting is one of the solutions to overcome th is problem. Retrofitting of already constructed building aids to lessen the energy consumption as it uses energy efficient materials and techniques. This paper involves the study and analysis of energy consumption of existing base building and retrofitted building. The results illustrate that yearly huge amount of energy can be saved by doing slight amendment in base building. The various advanced methods for retrofitting are explained to guide the tenants of other existing base buildings so that they can move towards energy saving practices. https://www.ijiert.org/paper-details?paper_id=140911