How to Measure Basement Windows

Measuring for basement windows, whether they are hoppers, sliders or any other style is just like measuring for more common window types like double hungs. When ordering windows, most suppliers ask for rough opening or exact size. The process outlined below is for obtaining the rough opening. If you are ordering windows through our site, you need to take your own deductions when entering your size. Most people deduct anywhere from .25-.75" from the rough opening to get the exact size of the window needed. In general it is always better to be too small rather than too big because it is much easier to fill gaps than enlarge an opening.

Detailed Video On Measuring

Measure For Replacement Windows: In this 1 Minute video, courtesy of Jeld-Wen, goes through how to measure for replacement windows. If you need more help, contact us, and we’d be happy to guide you through the process.

Step 1

Measure the Width of the Window Opening First

Measure the width in three places:

  1. Top Width
  2. Middle Width
  3. Bottom Width

After you are done measuring the Top | Middle | Bottom parts of the Window Opening, take the smallest measurement and circle it

Step 2

Next we'll measure the Height of the Window Opening

Measure the height in three places

  1. Top Height
  2. Middle Height
  3. Bottom Height

After you are done measuring the Top | Middle | Bottom parts of the Window Opening, take the smallest measurement and circle it.

Step 3

Measure the Depth of the the Jamb at the deepest section of your window.

  • Our Windows are made with a Standard Window Frame Depth of 3.25".
  • This Size will Fit Most Window Openings. If you need something other than this Frame Width, please contact our support team to discuss.