Research shows that health, comfort and outputof employees in office are improved by a well-ventilated environment and access to natural light. These benefits are usually provided by strategically-placed windows.However, windows also invite unwanted heat loss/gain and condensation. Therefore, the concept of smart windows has evolved in recent years and has played a major role in reducing the cost of developing and maintaining commercial buildings.This exciting, cutting-edge window technology allows consumers to block either all light or just some by simply turning a knob or pressing a button. This type of light control could potentially save billions of dollars on heating, cooling and lighting costs. These high performance windows reduce energy consumption, minimise pollution sources, offer lower heat loss,and leak less air compared to traditional windows. Sometimes they also offer fire resistance which is an additional benefit. A typical window glazing system comprises of structural frames, sealants, glass panes and spacers.Factors like visuals(privacy, viewand glare), sun control, ultraviolet control, and lighting during the day can be controlled to some extent by optimally designing and implementing the glazing system of a commercial building.