Free Quote

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 2005, 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, Simonton, 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

Free Pro-Solar Shade Window Upgrade

Enjoy a free upgrade to Simonton Pro Solar shade windows with your replacement window purchase.

Get Started Now

Request appointment?

Marvin Windows and Doors
Milgard Windows and Doors
Simonton Windows and Doors