What measurement is used to measure the width of a window?

Answer 1

Windows are measured in the usual units of the country, whether metric (millimetres or metres) or imperial (feet and inches).

The part of the window that is being measured needs to be specified. It could be:

* the rough opening - the width of the hole in the wall into which the window will be fitted * the frame size - the width between outer parts of the window frame * the inside reveal to inside reveal width- the width between the timber trim around the window on the inside of the wall

* the daylight opening - the unobscured glass width * the sash dimension - the dimension of the opening part of the frame All these measurements have different uses and by, for example specifying only the rough opening width, the exact type of window frame does not need to be specified.