Design Windows & Doors, Inc.


About us

•Family Owned & Operated with over 15 years of experience in the window industry. •Owner is a Vietnam Veteran & ex-LAPD officer (ask for special discounts for Military, Police, and Fire Fighters*) •Licensed Contractor #912367 •We are financially secure and our company continues to grow. We are backed by 2 million in liability insurance and 1 million in workers compensation insurance. •A rated member with the Better Business Bureau and a member of the California League of Homeowners. •We receive a large amount of repeat and referred customers. •Financing offered through several companies.*OAC •Lifetime warranties, most include accidental glass breakage. •All installers are in house, we do not subcontract. Lead Installers are AAMA and RRP Certified. •Personalized service from start to finish. We pride ourselves on being very ethical, efficient, and strive to provide outstanding customer service.

Areas Served

San Bernardino County, Riverside County, Los Angeles County and parts of San Diego County

Consumer Experience Rating

To earn the Exceptional Consumer Satisfaction Diamond, the dealer must have 15 or more reviews and maintain an average of 4.5 stars or higher.
To earn the Showroom Diamond, the dealer must have a showroom with a minimum number of Milgard products on display.
To earn the Web-Site Diamond, the dealer must have their own Web-site with information about the Milgard products and the services they sell.
To earn the AAMA Certified Diamond, the dealer must have an employee on staff that has completed the AAMA Installation Masters training and passed the AAMA Certified Installer test.
To earn the Product Knowledge Diamond, all Dealer Sales Consultants must pass a series of standardized Milgard administered tests demonstrating Milgard product knowledge.


504 S. Mountain Ave.
Ontario, CA 91762
United States



Monday 8:00am - 5:00pm
Tuesday 8:00am - 5:00pm
Wednesday 8:00am - 5:00pm
Thursday 8:00am - 5:00pm
Friday 8:00am - 4:30am
Saturday 9:00am - 4:00pm
Sunday Closed


Consumer financing
Essence Dealer
Free estimates
Has Showroom
New construction
Offers installation
Replacement Specialist


  • Better Business Bureau

The information shown on this page is provided by your local Milgard Certified Dealer which is responsible for the content of and views expressed on this page. Milgard is not responsible for the accuracy of such content, and any views expressed do not necessarily represent the views of Milgard Windows & Doors.

For full dealer information and product availability, please contact your local Milgard Certified Dealer.

Rated 5 out of 5 by This dealer by far has the best customer service! We highly recommend them. We are throughly pleased with our window's from Design Windows & Doors, Inc. ; The worker/employee's are all are professional, yet caring and concerned. We can't believe the difference in our home since the windows were installed. Our home is brighter and appears to be more open. Great investment!!! Many company's gave us estimates not one could compare to this dealer. Yes, we highly recommend this company. You will not be sorry just overjoyed! November 7, 2013
Rated 5 out of 5 by Excellent The salesman, office personnel and installers were all very easy to talk to, very friendly, very professional and always very helpful. Thank you the Windows look great, the job the installers did was awesome. They made sure to leave their work area very clean and the finish product looks great. December 4, 2015
Rated 5 out of 5 by Couldn't have had a better experience I am so happy that I went with Design Windows for my Milgard windows!! Any questions were answered promptly and service by the salesman and installers was excellent.. Thank You DESIGN WINDOWS November 23, 2015
Rated 5 out of 5 by Best windows ever! You guys were on time and worked very hard to install 3 new windows where there were none before. Professional and courteous all the way through. Your prices were excellent as well. When we decide to install more windows in our home, I'm gonna be calling you guys back. August 26, 2015
Rated 4 out of 5 by Got what I paid for The windows that I purchased were Tuscany Milgard. There were 13 windows. They were purchased for reduction of sound coming from the freeway. The back bedroom windows are heavier and thicker than the rest of the windows. It has cut down the sound from the freeway by 50%. I could have gone higher, but the triple window would looked strange. I am most pleased with the type of windows in style. They open and close much easier than the old windows did, and the security features along with the lack of temperature change from the windows will provide a much more energy efficient home. There are photos of what the home use to look like to what it looks like now. Very impressive! I wish to thank Design Windows and Doors for making this project a success. August 8, 2015
Rated 5 out of 5 by Great company, great insurance policy, great install crew. We love our new windows! And just in time as two days of monsoon rains showed us that there were no leaks. The HERO program works well for us as we need the write off in our retirement. The crew was knowledgeable and able to modify the garden window so that it looks great! We notice that our rooms are cooler as a result of the new windows which replaced our old single pane windows. July 20, 2015
Rated 5 out of 5 by Fantastic The crew provided did an excellent job! They were very professional. Arrived a little earlier than expected, and that was fine with me. I would not hesitate to give them an "A" one referral! July 3, 2015
Rated 5 out of 5 by Professional Sales, Support & Install From day of sitting with sales rep to the day the job was done, Design Windows & Doors provided professional help every step of the way. We were told exactly what we could expect at the time of signing & it all came true. We are delighted with the 14 new windows & the professional way by which they were installed. We highly recommend this company for anyone interested in Milgard windows. July 1, 2015
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