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Replacement Windows

Discover replacement windows from Renewal by Andersen Polar Block Sales, engineered with our proprietary, low-maintenance materials for lasting durability and superior home energy efficiency.

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AcclaimTM Windows for Every Home

The Renewal by Andersen Polar Block Sales team makes customization simple for homeowners across Illinois and Iowa. We guide you through all your options—from interior wood tones to exterior colors, hardware finishes, and grille patterns—to create your home's perfect style.

Double-Hung Windows

Combining a classic aesthetic with modern functionality, our double-hung replacement windows offer versatile top and bottom sash ventilation and extensive design choices.

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Why Fibrex® is Superior

Why Fibrex® is Superior

Unlike many competitors who are limited to offering fiberglass or vinyl, Renewal by Andersen created Fibrex®, an exclusive composite material that consistently outperforms traditional options. This unique blend combines the incredible stability and structural strength of wood with the low-maintenance advantages of vinyl, making it well suited for Illinois and Iowa's changing seasons. Fibrex® is measurably two times stronger than vinyl and offers 700 times better insulation than aluminum.

The innate strength of Fibrex® allows our designers to create sleeker, narrower frames, maximizing your glass area for larger, more beautiful views. Plus, its heat-defying properties mean you can choose deep, dark exterior colors like black, navy, or brown without concern for warping during hot Midwest summers.

Window Replacement Before and Afters

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Explore Our Replacement Entry & Patio Doors

If your project involves more than just windows, Renewal by Andersen Polar Block Sales also offers a full line of custom-built replacement doors.

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Replacement Entry Doors

Our selection of secure, high-quality replacement entry doors includes durable, low-maintenance fiberglass options designed to perform through Midwest weather.

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Replacement Patio Doors

Effortlessly open your living area and blur the line between indoor comfort and outdoor space with our highly functional replacement patio doors.

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Your Local Illinois and Iowa Experts

Proudly serving homeowners across the Central Illinois, Greater Des Moines and Quad Cities regions and surrounding communities.

Please enter in your zip code to find information about an RBA store near you, or call the number below for more information.

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To contact us, call: (800) 320-4440

Frequently Asked Questions

Fibrex® is an exclusive composite material created by Renewal by Andersen that combines the structural strength of wood with the maintenance-free properties of vinyl. Unlike competitors limited to standard vinyl or fiberglass, Fibrex® is measurably twice as strong as vinyl and offers 700 times better insulation than aluminum—without ever needing to be scraped, painted, or replaced. It also contains 40% reclaimed wood fiber, making it a more environmentally conscious choice.

Polar Block Sales offers a comprehensive range of replacement window styles to suit virtually any home and opening. These include double-hung, casement, sliding and gliding, awning, picture, bay and bow, and custom specialty windows in 16 geometric shapes. Each style is available in 48 color combinations with 11 hardware finishes and a variety of grille options.

Our Polar Block Sales team offers multiple high-performance glass packages specifically calibrated for the four-season climate of Des Moines, the Quad Cities, and Central Illinois. During your consultation, we review the metrics that matter most for your home: solar heat gain, visible light transmittance, overall thermal efficiency, and UV protection—so you get the right glass for both winter heating demands and summer cooling needs.

Renewal by Andersen Polar Block Sales serves the Greater Des Moines, Quad Cities, and Central Illinois areas. Our local design consultants provide in-home consultations and custom quotes at no cost.

The process starts with a free in-home consultation, where one of our local project consultants measures your openings, walks you through all style, color, glass, and hardware options, and provides a custom quote. Once you move forward, your windows are custom-built to order and installed by our Certified Master Installers.

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