Welcome to the Window Designer
How to measure your window
Measure the opening in at least 3 places across the width, top, middle & bottom, take the smallest measurement & Deduct 10mm, this will be the width of the window. Measure the height of the opening at least 3 times left, middle & right, take the smallest measurement & deduct 10mm this is the height of your window. Check the opening is square.
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