About Us

When homeowners who are lucky enough to live in the beautiful Southern California need exceptional replacement doors and windows, they can always call on the trusted services of Design Windows and Doors. Since 2006, we’ve provided high-performance products from the industry’s top manufacturers, and all of our services are delivered by fully licensed, experienced professionals.

All you need to know about Design Windows and Doors can be found in the many glowing reviews and testimonials from our past customers, and much of our work comes from referrals and repeat business. We cater to homeowners throughout the Southern California, from the cutest two-bedder to the palatial mansion. Every member of our team is committed to providing a pleasant experience from start to finish and a final result that will exceed your expectations.

Southern California Replacement Doors and Windows

Doors and windows impact the style, value, and energy efficiency of your home. When it’s time to upgrade, our family-owned business offers an impressive selection sourced from brands including Jeld-Wen, Milgard, and Marvin. In addition to top-rated products, there are other benefits of working with Design Windows and Doors, including:

  • Free design consultations and estimates.
  • Lead installers who are AAMA- and RRP-certified.
  • Exceptional work ethic and courteous service.
  • Accreditation by the Better Business Bureau.
  • Four-year labor warranty in addition to any manufacturers’ warranties.

From start to finish, you’ll notice the difference in service provided by our courteous, knowledgeable staff. Some home improvement companies just want to close the sale, but we want to take the time to educate our customers so they can make informed decisions about what is best for their homes.

Get In Touch for Beautiful, Top-Quality Doors and Windows Today

If you need new windows or doors, contact us to schedule a free, in-home estimate and to enjoy the award-winning service that has made us a top choice for home improvements in Southern California. Call Design Windows and Doors today or fill out our online form now to get started. 

Design Windows and Doors - Office Design Windows And Doors

  • 504 S Mountain Ave Ontario, CA 91762
  • (909) 377-4447

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