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The demand for buildings that can deal with current challenges such as environmental conservation, climate change, and sustainability etc., has increased as cities have grown more rapidly. Retrofitting of existing buildings utilizing ideas such as sustainability can enhance the energy performance of new and existing infrastructure while taking economic and cultural issues into account. Buildings account for over 40% of global power demand as well as 40% of CO2 emissions. This paper presents a thorough analysis of thermal performance parameters for composite building walls, including thermal transmittance. Renewable energy sources provide an endless supply of power. Solar energy can be used passively or actively to complement a building’s energy demands. It is possible to minimize energy consumption for a building’s heating, cooling, and lighting needs by using a climate-sensitive strategy in the design of architectural elements such as static sunshades, walls, and roofs. It has been observed that the basecase consumes 93134.4 kWh, whereas the proposed-case consumes 68317.7 kWh. There is a huge 26.65% reduction in the annual energy consumption by adopting passive design strategies.