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INSERT VS. FULL-FRAME WINDOW INSTALLATION: WHICH IS BETTER?

Proper installation is key to long-term window performance. But apart from proficiency, the very replacement method used matters, too. There are many ways to replace windows, but the most common kinds are insert and full-frame window installation. The former only involves setting new units into the existing frames whereas the latter requires the replacement of the entire window.

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We discuss both below.

Which One Makes More Sense?

In Renewal by Andersen® of St. Louis’s book, the use of the insert is the more attractive choice since it’s less disruptive and costly. However, it may not apply to your situation when your old window sill and frame are no longer square, solid  and in good repair.

Sometimes, the existing construction doesn’t lend itself to insert windows installation because it’s excessively leaky. When the damage to the old frame is beyond repair, full-frame replacement is necessary to guarantee structural integrity and prevent air infiltration.

But then again, structurally sound, old frames don’t necessarily qualify for insert window installation. If the size of your existing wall openings doesn’t meet the latest fire egress codes, full-frame replacement is required.

What to Expect From Renewal by Andersen®?

Count on us to install your double-hung, bay, bow, picture, sliding, specialty  and casement windows properly. During your in-home consultation, our representative will evaluate your existing units and assess the condition of their frames, sashes, casing  and trim. We’ll look for visible structural issues and note unforeseen ones to prepare our installers.

Two of our experienced specialists (design consultant and project technician) will inspect your existing openings thoroughly. With our proven local reputation, you can bank on our strong attention to detail for the appropriate window installation method for your project.

At Renewal by Andersen of St. Louis, our precise evaluation and installation processes ensure your energy efficient windows will perform as expected for a lifetime. Let’s get your project rolling. To discuss your Missouri window replacement, call us at (314) 310-3636 to schedule your FREE, in-home consultation in St. Charles, MO, at your convenience.

Reviews

"Have nothing but great things to say about the window installation done today by John Hutchinson with Renewal by Andersen! He was friendly, personable and professional and did a great job installing. He did a great job of putting down roller pads and tarps with next to zero clean up. Would highly recommend them for any window replacement needed!"

Mark V.
Jun 26, 2025

"We had our new Renewal by Andersen windows installed on June 5th & 6th, 2025 and we LOVE them! The quality, beauty, and functionality are best-in-class! The whole experience from dinner presentation at Lazy River Grill, the initial in-home sales consultation and measurement, the regular communications from the salesman and concierge, and the installation team’s professionalism and skills made the process so seamless. This is the second home we have opted for Renewal windows and doors and have been delighted both times! Thank you Renewal by Andersen STL! "

Jeff C.
Jun 7, 2025

"I had an excellent experience with RbA STL. Our designer, Courtney, was great and the finished product is awesome. The installation was easy and the gentlemen left our home cleaner than they found it upon entering. I would recommend RbA STL - you’ll get tired from their constant contacts, and that’s a GOOD thing!"

Jeramy D
Jun 3, 2025

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