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How to Measure Windows & Doors

Step 1: Begin by measuring the inside width of the old window frame, jamb-to-jamb, in 3 places: across the top, the middle, and along the bottom. Write down the smallest of the three measurements.

Step 2: Measure the window height from the top of the inside frame to the bottom of the frame in 3 places: at the left jamb, in the middle, and at the right. Again, write down the smallest of the three measurements.