The thickness of the glass is proportional to the insulation from weather elements. It also determines the durability, security, and noise resistance. Apart from this, it can also improve the aesthetic appeal. However, the thickness of uPVC windows depends upon structural needs, weight, manufacturer’s specifications, performance required, and individual requirements. In general, glasses with a thickness of 4-6mm are used for homes. There is a variant called double glazing, which has 2 layers of glass, each with a thickness of 4-6mm, and the gap is generally filled with inert gas. In triple glazing, there are 3 layers of glass, each with a thickness of 4-6mm, and the gap is filled with inert gas. These are the factors to be noted while analyzing the thickness of glass.