How do I measure for bay window valances? How do I measure for bay window valances?
In order to measure for bay window valances, you will need a tape measure, a piece of paper, and a pen. Take your tape measure and use it to get the exact dimensions of the window frame. You need to know the distance across the window and how tall you want the valance to go up the window. Draw a diagram of the window on your piece of paper. When you get a dimension, write it down on your diagram so that you know exactly which dimension is which. Then you can take the paper with you when you purchased the valance.