How to Measure Windows

Measuring for new construction windows or replacement windows is easier than you think. And to make it even easier, we share some industry trade secrets in the video below. The same steps apply whether you are ordering standard replacement windows or ECOstorm® hurricane impact windows. Precise measurements matter most in code zones, where the window has to be installed per its product approval.

1. From the outside of the home measure the width of the opening at top, middle, and bottom.
2. Take the narrowest measurement and subtract ¼ inch. This will be the width of the window you order.
3. Measure the height of the opening at left side, middle, right side.
4. Take the shortest measurement and subtract ¼ inch. This will be the height of the window you order.
5. Repeat for each opening.

Download our helpful measure sheet

If you still have questions on how to measure your windows or if you believe you have brick moulding please feel free to call us at 855-290-6366, and we’ll walk you through the process!!

Windows in Wood Siding, Hardie® Siding, Vinyl Siding, or Stucco*

1. From the inside of the home measure the width of the opening at top, middle, and bottom.
2. Take the narrowest measurement and subtract 1/8 inch to 1/4 inch. This will be the width of the window you order.
3. Measure the height of the opening at left side, middle, right side.
4. Take the shortest measurement and subtract 1/8 inch to 1/4 inch. This will be the height of the window you order.
5. Repeat for each opening.

Download our helpful measure sheet

* If you are planning on using a retrofit window installation technique with a stucco flange for stucco application please call us and we’ll walk you through the measuring process.  It’s super easy.

If you still have questions on how to measure your windows or if you believe you have exterior brick moulding trim, or you have old builder’s grade vinyl windows please feel free to call us at 855-290-6366, and we’ll walk you through the measuring process!!