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HOW TO CHOOSE THE RIGHT WINDOW SIZE

On most windows installation projects that we work on, determining the replacement windows’ sizes merely requires an accurate measure of existing window openings. Our replacement windows are custom-built to fit the original openings, after all. Once in a while, though, a homeowner may want to resize their windows during remodeling. In these cases we often get asked if there are rules on choosing replacement window sizes.

How To Choose The Right Window Size

While there isn’t a one- and-done rule for this, the following guidelines may help you determine the appropriate window size.

Window Sill Height

The International Residential Code (IRC) states that sills on operable windows should be at least 24 inches from the floor. Ideally, you should be able to see out while sitting down on a chair or on the bed. If the design calls for a much lower sill, your choices will be limited to non-operable windows like picture windows or floor-to-ceiling windows.

Window Head Height

There aren’t rules governing how tall windows should be, and in many cases, it’s a subjective design choice. Too much space between the window head and the ceiling would result in less natural light – not an ideal design if you’re planning on buying energy-efficient windows. That is, unless you’re planning on installing clerestory window to complement them. Too little space leaves little room for window treatments.

Width-to-Height Proportion

Coming up with the width in relation to height is another subjective design choice, and sometimes the architectural style comes into play. For instance, continuous windows are common in modern architecture but would look out of place in traditional architecture. Grilles can also be a factor on traditional windows: grilles that are taller than they are wide generally are best, especially on wide windows.

Once you have selected the right window proportion, keep it consistent across all windows in the house for a cohesive look; inconsistent window sizes are not easy on the eyes. If you’re unfamiliar with building codes, our expert consultants are well-versed with it and will tell you if your design is compliant. Set your expectations early on that the window design won’t be exactly the same as you planned it once these factors are applied.

Renewal by Andersen® of St. Louis serves St Charles, MO and nearby areas. If you need help with finding the right window sizes or styles such as casement windows, call us today at (314) 208-3911 or fill out our contact form to schedule a free in-home consultation with our expert consultants.

Reviews

"We had a large picture window and two side windows replaced. Everyone from the person who took our order to the installers were top notch. We got exactly what we wanted. Granted, we had to wait a few months, just like you do for everything these days, but we were told that up front. The windows were well worth the wait. We've replaced windows before by going to home maintenance stores. Don't waste your money on those. Our Renewal by Andersen windows look great, they operate like a dream, and are worth every penny. Quality through and through."

C. Roberts Owens | RbA of St. Louis, MO - Maryland Heights

"Extremely satisfied, definitely will use again, worth every penny!"

B. Huggins | RbA of St. Louis, MO - Maryland Heights

"They did exactly what they promised. They showed up on the day they were scheduled put in the doors and window we ordered. The installers were friendly, efficient and cleaned up as promised. We were happy with the entire process!"

R. Daw | RbA of St. Louis, MO - Maryland Heights

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