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 from 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!
Date published: 2013-11-08
Rated 5 out of 5 by from Top notch service in all areas I love my Milgard Windows . I chose the French Window and Sliding glass doors . My home looks years younger with the new Windows .
Date published: 2016-11-18
Rated 5 out of 5 by from Awesome Job We had new windows installed by Design Window and Doors. They did a great job and were very professional. It went smooth and looks great. They did a great job.
Date published: 2016-10-14
Rated 5 out of 5 by from Totally AMAZED! I had many estimates and Decided to go with Design Windows & Doors. Our rep Bill was very informative and professional and so were the 2 installers that came to complete the job. I also very much enjoyed working with the office gals as they kept me up to date on the work in progress. I highly recommend this company.
Date published: 2016-10-14
Date published: 2016-09-15
Rated 5 out of 5 by from my dealer was very polite and helpful I was very happy with my windows. the 2 guys sent, were very polite, on time, neat, and made sure that I was satisfied with the job.
Date published: 2016-09-08
Rated 5 out of 5 by from Beautiful! We had our windows installed a week ago. I really love them We went with Milgard Tuscany. The installers were great. They were hard working and very professional. We couldn't be happier. I would highly recommend Design Windows and Doors!
Date published: 2016-08-14
Rated 4 out of 5 by from Great job! I love my new windows! The process was smooth and easy from the day I sat down with the sales representative to the day of installation. They even called me to follow up and make sure I was pleased with everything even though I initialed all the checklists that the installers provided. This being my first time buying windows I didn't know much at all so I had plenty of questions for the sales rep and he answered them all. I decided to go with the Milgard Tuscany series windows primarily because of the lower price and high end features that it offered. During installation I immediately noticed the difference in sound. I was trying to talk to one of the installer through a closed window he was working on and he couldn't even hear me, whereas before I could have full conversations, hear all the neighborhood noises and wind through my old rattling aluminum frame windows. The installers were cleaner than I had originally anticipated, thought I would have a lot of dirt left around on furniture pieces close to windows afterwards but it wasn't bad at all. They did a really clean finish around the outside of the windows. The windows have really brought the feel of my 1978 home into the 21st century inside and out. I went to sleep with all the windows resting on the vent locks that night which I think have become my favorite feature of the windows because it still allows me to set the alarm! So if your looking to save on your energy bill, reduce noise, and get a great install with excellent customer service without breaking the bank, Milgard is a nice window and Design Windows & Doors installs them very well.
Date published: 2016-07-22
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