Standard window sizes, rough openings, frame sizes, egress needs and how to measure so replacement windows fit.
Window size is described by width and height, and the numbers can mean different things. The frame size is the window itself. The rough opening is the hole in the wall, a little larger to allow for shims and foam. For inserts, the pocket in the existing frame is what matters. Standard sizes exist, but many older homes have openings that are slightly different, and a custom size may be a better fit than forcing a standard one.
Measuring needs care. Measure the width and height at several points, since old frames are often out of square, and use the smallest number. Note the depth, the sill slope and any obstructions. Bedrooms may need an escape-friendly opening, which has minimum sizes under local codes, so check the requirement. In Nashville, we measure every opening ourselves before anything is ordered, and give you the numbers in writing, because a small error can cost a lot.
The size of the window itself.
The hole in the wall.
The space inside an existing frame.
Common sizes that are often available.
Escape-friendly openings for bedrooms.
Made to fit unusual openings.
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No. Older homes often have unusual openings, and custom sizes may fit better.
It means an opening large enough to escape through in an emergency. Check local requirements for bedrooms.
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