How Can I Ensure I Measure My Window Openings Correctly?

How Can I Ensure I Measure My Window Openings Correctly?

Measuring a window seems easy at first glance. Just grab the height and width, and you’re set! But the reality is that there are countless window sizes out there. Each one is tailored to fit its designated space perfectly. Getting it right is crucial. Even a slight mistake in measurement can disrupt the installation and influence the window's performance.

To help you avoid these pitfalls, here are some handy tips for accurate window measurements.

Measuring your window:

While it's correct that height and width are the only dimensions you need, taking just two measurements isn't enough for precision. You should actually take six measurements to ensure accuracy. To determine the width, measure from the left jamb to the right jamb.

Make sure to do this at the top, middle, and bottom of the jambs to gather three width measurements. For height, measure from the top down to the windowsill on both sides and in the center.


Refresh your knowledge of window anatomy to ensure you're measuring correctly. If you accidentally measure only to the sash stops instead of the jambs, or if you stop at the interior trim of the sill when checking height, your new window may end up being too small.

On the other hand, if you go beyond the jambs, head, or sill, your next window could be too large for the opening. Many homes have a combination of window styles, and your measuring approach might need to change based on the window type or trim:

  • For windows without headers- measure from the drywall at the top to the sill at the bottom. If there’s no trim on the windowsill, measure from drywall to drywall.
  • For windows with sliding sashes- be sure to take your measurements at the center where the two sashes meet.
  • Once you’ve taken six measurements- write down the shortest height and width rather than the average or middle measurement. There’s often more to the window frame than you can see, so it’s wise to err on the side of caution when ordering replacement windows.

What to Consider for Your Replacement Window Sizing


The initial step in the window replacement process involves obtaining a rough estimate of the dimensions of one or all of your windows. In addition to measuring the height and width of each window, it is advisable to consider several other factors to aid in the estimation:

  • The style of the window
  • The placement and orientation of the window
  • The room in which the window is located
  • Any issues or challenges encountered with the window

With this information, a window specialist can provide more than just a cost estimate for your replacement project. They can offer informed recommendations regarding which windows will best suit your aesthetic and functional requirements.

An in-home consultation would further enhance this process (pellabranch.com/new-england.) During such a consultation, a window expert can evaluate and address any performance issues you may have with your current windows, ensuring that these concerns are taken into account during the replacement.

They will also present a variety of samples, allowing you to visualize how different options will integrate with your home’s interior design. And they will take precise measurements of your windows once more.


Professional Window Measurements are extremely important

Accurate measurements are essential for major home improvement projects such as countertops, cabinets, decks, and flooring. Prior to commencing any work, it is advisable to have a professional conduct these measurements. This aligns with the adage, “Measure twice. Cut once.”

Professionals and contractors aim for precision to ensure that the final results meet your expectations and that the installed products function correctly. Even a slight deviation in measurement can result in significant issues and expenses, including:

  • Windows that fail to open, close, or lock properly
  • Drafty conditions around windows
  • Decreased energy efficiency
  • Potential water damage, mold, or rot due to leaks and cracks
  • Window condensation problems
  • Safety hazards

On the other hand, a professional window measurement is provided at no charge, as it is a standard component of a free consultation. While you may measure windows independently to estimate your needs and project costs, a professional measurement guarantees a flawless fit. Go to: pellabranch.com/new-england and have a trained Pella representative do it for FREE!

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