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The Experts Weigh In: Are There Standard Window Sizes?

Did you know that there is no such thing as standard window sizes? Many home improvement manufacturers list common window sizes in their catalogs, which can result in homeowners assuming their window measurements must fit within those size standards. But assuming can lead to ordering a window that is not quite the right fit – costing more time, money and headaches for all involved.
Do standard window sizes exist?
So, if there aren’t standard window sizes, how do you know what window type and size is going to be the perfect fit for your home? Simonton recommends having replacement windows custom sized and built for each opening to ensure the window will perform the way it’s intended. While standard window widths and lengths are often used for new construction, standard sizes aren’t necessarily right for replacement windows.

Why your home doesn’t have standard window sizes.

To maintain the comfort and safety of your home, windows must fit properly and be free of any gaps letting in unwanted air or moisture. Replacement window sizes range based on a number of factors, such as:

  • The time period your home was built. Depending on when your home was constructed, you may have odd or unique window sizes that were stylish or common at the time, but are no longer commonly used.
  • Age of your home. As homes age, windows, framing and your home’s siding begin to weather over time, which can also affect the size of the opening.
  • The style and region of your home. Do you live in a classic brick home, or does your residence have a more modern style? Depending on where your residence is located inside of the United States, your home could have an average window size that differs from your neighbors in the next state. Regional design elements and the overall style of your home play an important role in the size of your window openings.
  • New construction vs. replacement windows. New construction windows are built differently than replacement windows, also affecting the window dimensions. As you’re faced with replacing your old or worn-out windows, you’ll need an accurate measurement of your window dimensions to ensure you get the perfect fit, the first time around.

What this means for your window replacement project.

Why standard window sizes are a myth.Buying a custom window for your home will save a lot of headaches and unnecessary work when compared with trying to buy a “standard” or “common” window size. With a custom window, you will be sure that the window will fit perfectly to your home.
The term “custom” can sometimes mean it costs more. But that’s not the case with Simonton Windows & Doors. All of our windows are crafted specifically for each customer, and we guarantee it will seamlessly fit with the openings in your home. 

If you’re going the project alone (without a contractor), it is imperative that the measurements are exact. Home Depot recommends following these steps when measuring your windows:

  • To Measure Window Height: 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. 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.
  • To Measure Window Width: Measure between the jambs at three points: 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.
  • To Measure Window Depth: Ignore all pulleys and parting strips when measuring for depth dimensions, as they’ll be removed for 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.

You have your window measurements, now what?

Step One: First things first, you’ll need to decide what type of replacement window you need for your home. Thinking about adding a garden window to your kitchen to let in more light? Or are you considering replacing a few double hung windows on the front of your home? Either way, Simonton has a huge selection of replacement windows that will fit your home improvement needs.
Step Two: Next, you’ll need to choose the type of material for your replacement windows. At Simonton Windows & Doors, we’re proud to offer vinyl replacement windows to better blend with your design style and budget. Below, we’ve weighed the pros and cons of the three main types of replacement window materials so you can decide what’s best for your home.

  • Vinyl windows: Vinyl windows perform similarly to wood windows when comparing energy efficiency, but are significantly less expensive and require less maintenance. This makes vinyl windows the best alternative to wood windows.
  • Aluminum windows: Aluminum windows are the least expensive and are low-maintenance, but they also offer the least amount of energy efficiency of any window material available.

Step Three: Now it’s time to choose the customization. Simonton offers a wide variety of color, grid, hardware and energy efficiency options to accent inside whatever space you’re incorporating your replacement windows. Need some inspiration? Browse through our gallery and find a style that speaks to you.

Ready to get started?

Now that we’ve blasted the myth of standard window dimensions, we know you’re itching to replace those windows you’ve been thinking about. Contact a pro in your area today to get started.


home depot measuring windows standard window sizes vinyl windows window measurements window sizes
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