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Windows Built for life®

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Beautiful, Lasting Fiberglass Windows for Your Quad Cities Home

If your current windows are drafty, difficult to operate, or driving up your energy bills, it’s time for an upgrade. Infinity® by Marvin® fiberglass windows solve the problems that plague ordinary vinyl windows—delivering superior performance, stunning aesthetics, and worry-free ownership for decades to come.

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Local Expertise, National Brand

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Factory-Certified Installation

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Direct Manufacturer Support

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Limited Lifetime Warranty

Trust What Our Window Replacement Customers Have To Say

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"This company exceeds every expectation in every category. Highly recommended for their commitment to customer satisfaction and honesty."

Michael D.

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I have used Mainstream to replace windows in two residences that I have owned over the last 20 years and always they did an excellent job.

Jay & Kate F.

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