Ontario Replacement Windows and Doors

Palm trees, mountain views, and reliably pleasant weather are some of the best things about living in Ontario. Whether you live in a charming bungalow, a Spanish Mediterranean home, or a vintage Craftsman stunner, you can count on Design Windows and Doors to provide stylish replacement windows and doors that offer the look you want and the high performance you deserve.

Since 2005, we’ve been offering the best products and expert installation services to local homeowners. That commitment to quality has earned us accreditation with the Better Business Bureau and countless positive reviews from past customers. We offer:

  • Replacement Windows
  • Replacement Doors

High-Performance Ontario Replacement Windows

There are many good reasons to update your Ontario house windows, including refreshing its exterior style, enhancing energy efficiency, and improving security. When you choose Design Windows and Doors, you’ll enjoy all of these benefits—and more. That’s because we only install Ontario replacement windows from trusted manufacturers like Marvin, Milgard, and .

Every window meets our strict standards for durability, performance, and style. Speaking of style, we offer a comprehensive selection of Ontario vinyl windows, wood windows, and fiberglass windows including:

  • Awning Windows
  • Bay Windows
  • Bow Windows
  • Double Hung Windows
  • Hopper Windows
  • Slider Windows
  • Casement Windows
  • Picture Windows

... and more!

Ontario Door Replacement Products from Top Brands

Updated entry and patio doors are the other specialty of our family-owned business. We’ll help you choose from a large selection of Ontario door replacement products to get the style that complements your home along with the features that are most important to you.

Welcome family and friends with an entry door or make the most of your outdoor space with an updated patio door—either way, you can count on expert installation and industry-leading warranties.

Learn More About Ontario Window and Door Replacements

Update your Ontario home with quality windows and doors from our highly rated home improvement specialists. Call Design Windows and Doors today or fill out our online form now to schedule a free, in-home design consultation and estimate. 

12 Months - Zero Down - 0% APR

Design Windows and Doors makes it easy for you to enjoy all the benefits of the exceptional quality products by offering flexible financing.

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5.0 out of 5
based on 188 Reviews
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Design Windows And Doors Reviews


I had my two homes installed.  The response was very quickly to set up a presentation. The sales rep came out with samples and choices.   The crew was fast, courtesy and efficient. I highly recommend this company.

Marvin Windows and Doors
Milgard Windows and Doors