How To Measure For Replacement Windows

Measuring the Window Opening

Measure Width:

First you need to measure between the jambs of the existing window at three points: the top, middle and bottom of the window opening. Measure from the surface of the jambs, not from the trim strips or parting beads in your old window opening. Use the smallest of these three measurements to order the window.

Measure Height:

The next step you are going to measure from the high point of the sill of your window (the surface closest to the inside of the window) to the top of the window opening. Again you are going to make three measurements: one at the left side, one at the center and one at the right side of the window. Use the smallest of these three height measurements to order the window.

Measure Depth:

Ignore parting strips and pulleys when you are measuring for the depth dimensions, as they will be removed for the replacement window installation. There must be at least 3 1/4 inches of opening depth between the inside window trim and the outside blind stop strip. This much area is necessary to accept the depth of the replacement window.

Purchasing Your Replacement:

With the measurements you are ready to go to your local Hardware store, Lowe's or Home Depot. Most manufacturers will automatically deduct 1/4" from your measurements and cut to nearest 1/8" for both height and width for an easy fit.

If you are not confident in your measurements, it is always recommended that you seek help from a professional, there is nothing worse than having to wait two to three weeks for your window to arrive at the store and only for it not to fit, causing you to have to wait an additional number of weeks for a new order.

Tools needed: (click on tool for brand we recommend)

Measuring Tape

Pencil

Notepad

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