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How to Measure

How to Measure

Measuring for your new construction or vinyl replacement windows is easy.
You’ll need:

  • A tape measure
  • A way to note the measurements (notepad and pencil, Notes app on phone, etc.)
  • A ladder if the window is too tall to reach easily
  • It can also be helpful and save time to have an assistant to spot the ladder or write down measurements

Measure the Window Opening

To get the correct measurement for your window opening, you’ll measure three variables: width, height and depth.

Measure the Width

The window jambs are the vertical sides of the window. Measure from jamb to jamb, across the top, middle and bottom of the window opening. If you’re replacing old windows, ignore any trim strips in your old window opening and measure right to the jamb.

Use the smallest of these three measurements for your order.

Measure the Height

The window sills are the horizontal pieces across the top and bottom of the window. Measure from the sill to sill, taking three measurements, one at the left side, one at the center and one at the right side. As with your previous measurement, if you’re replacing old windows, ignore any trim strips in your old window opening and measure right to the jamb.

Use the smallest of these three measurements for your order.

Measure the Depth

Measure from the front of the jamb to the window on each side. Take the same measurement from the sills, as well.

If you’re ordering a vinyl replacement window, ignore any pulleys or trim strips when measuring for depth; they'll be removed when the replacement windows are installed.

Order Your Windows

If you order your windows through our online store , deduct the following:

  • 1/2-inch from the width
  • 1/2-inch from the height

If you request a quote or order through our toll-free number, give our friendly window expert the opening size but don’t deduct the extra ½-inch.

Need Help Installing a Window You Already Bought?

Whether you bought new construction windows or vinyl replacement windows, our downloadable, printable instruction sheets will make installation simple. You can also watch our installation videos .

Install New Construction Windows

Install Vinyl Replacement Windows