Urbanization has generated an exceptional need for constructing new buildings. The integration of these new structures with existing ones has amplified energy consumption, resulting in sharp greenhouse gas (GHG) emissions. In India, the buildings sector, which includes both residential and commercial buildings, accounts for 33% of the country’s total electricity consumption. Therefore, energy efficiency is one of the important parameters for the design of a building. In this work, a commercial building is modeled for a composite climate zone and then the building’s parameters such as window-to-wall ratio (WWR), wall insulation, roof insulation, air changes per hour (ACH), and shading are optimized to obtain improved energy efficiency than the baseline ECBC (Energy Conservation Building Code), ECBC PLUS, and SUPER ECBC Model. The results confirm minimization of energy consumption while maintaining a low Predicted Percentage of Dissatisfied (PPD) in composite climatic zone. The results are important to quantify various parameters to design energy-efficient buildings for sectors including residential and commercial.