The relationship between the thermal transmittance and solar heat gain coefficient has been studied in the following analysis and impact has been presented. For the purpose of analysis, the U values and SHGC of different fenestration of glazing are considered whilst the rest of the inputs are kept identical in all cases.Solar heat gain coefficient (SHGC): The ratio of the solar heat gain entering the space through the fenestration area to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation, which is then re-radiated, conducted, or convicted into space.Façade orientation should influence WWR. A north facing façade receives the least solar exposure and should have the largest glazing area. ASHRAE energy modelling guidelines penalise the building (by reduction of energy savings) if WWR percentage is more than 40 per cent. Hence, WWR should not exceed more than 40 per cent.Reduction of U value and SHGC plays a significant role in the reduction of the overall energy and thermal energy and likewise similar increase could have an adverse effect on the building energy consumption.India is the second most populated country in the world with nearly a fifth of the world’s population. According to the 2017 revision of the World Population Prospects, the population stood at 1.339 billion. Infrastructure and industries tend to increase by meeting population demand and growth, which will considerably increase the energy demand.