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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) 310-3636 or fill out our contact form to schedule a free in-home consultation with our expert consultants.

Reviews

"This was one of the best experiences I've ever had with a company. I ordered the windows in November and was told they wouldn't be here until July. That kind of delay the new norm so I wasn't a bit upset with the timeline. I was given an early present when they called to say the windows would be in at the beginning of May. We agreed on the week of May 16th to do the installation, there were 30 windows and a sliding door to install. They arrived promptly on their scheduled install date, and got straight to work. By the end of day one, they had all the upstairs windows complete and their work was incredible. Day two came with more of the same, the crew showed up promptly, got straight to work, and when they left they had every window downstairs installed. The third day they again arrived on-time, and got to work installing the door. The door and windows are perfectly installed. The two lads that did the installation did a phenomenal job, and were friendly to boot. I would give them more business if I had any :) The service I received from the company was great. They kept me abreast of anything that was going on with my order. I appreciate my concierge, Christina, she was good at communicating timelines and getting everything scheduled."

Lane Maxwell
Jun 28, 2022

"The two installers were great! They were polite and hard working and they cleaned up all the outside and inside. It was like they were never here. As for the windows, I love them, not only looks great, they are efficient. Now every window in my home has Renewal by Anderson."

Mark Palsgrove
Jun 23, 2022

"We had the pleasure recently of having Andersen replace all of our windows. From the very first interaction with the office personnel through the completion of the project, they have been nothing but professional. From Brian our sales rep to Christina the appointment scheduler, they were a pleasure to interact with. Installers Keith, John, and Evan were fantastic to work with. They went above and beyond to repair an area which was slightly damaged during the removal of a window...caulked and painted it. They took extra precaution to ensure the floors were covered while working inside and cleaned up each day inside and out. We love the look of our new windows and can't wait to enjoy the savings in utilities they'll provide. Thanks so much Renewal by Andersen!!"

Kevin Corrigan
Jun 15, 2022

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