Quick Answer: How to Measure Windows?
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Do you measure windows from the inside or outside?

Run a tape measure from the outside of the frame to the inside and take the measurement from edge to edge of the window frame.

How do I measure rough opening for Windows?

Measure the width across the bottom of your window opening between the inside faces of the framing on each side. Measure the height of the opening between the bottom of the header and the top of the sill on the left, right, and center of the opening. Measure the thickness of the flashing needed.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.

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