Design Windows & Doors, Inc.

Diamond Rating

To earn the Exceptional Consumer Satisfaction Diamond, the dealer must have 5 or more reviews within the last year on 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 dealers must have at least one member from each of their installation crews complete the AAMA Installation Masters training and pass the AAMA Certified Install 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

Store Hours

Monday8:00am - 5:00pm
Tuesday8:00am - 5:00pm
Wednesday8:00am - 5:00pm
Thursday8:00am - 5:00pm
Friday8:00am - 4:30pm
Saturday9:00am - 4:00pm

Services Offered

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

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.

Awards Received

  • Better Business Bureau

Areas Served

San Bernardino County, Riverside County, Los Angeles County, Agoura Hills, Alhambra, Arcadia, Artesia, Azusa, Baldwin Park, Bell, Bellflower, Bell Gardens, Beverly Hills, Bradbury, Burbank, Cerritos, Claremont, Compton, Covina, Culver City, Diamond Bar, Downey, Duarte, El Monte, El Segundo, Gardena, Glendale, Glendora, Hawaiian Gardens, Hawthorne, Hermosa Beach, Huntington Park, Industry, Inglewood, Irwindale, La Canada Flintridge, La Habra Heights, Lakewood, La Mirada, Lancaster, La Puente, La Verne, Lawndale, Lomita, Long Beach, Los Angeles, Lynwood, Manhattan Beach, Maywood, Monrovia, Montebello, Monterey Park, Norwalk, Palmdale, Palos Verdes Estates, Paramount, Pasadena, Pico Rivera, Pomona, Rancho Palos Verdes, Redondo Beach, Rolling Hills, Rolling Hills Estates, Rosemead, San Dimas, San Fernando, San Gabriel, San Marino, Santa Fe Springs, Santa Monica, Sierra Madre, Signal Hill, South El Monte, South Gate, South Pasadena, Temple City, Torrance, Vernon, Walnut, West Covina, WhittierAliso Viejo, Anaheim, Brea, Buena Park, Costa Mesa, Cypress, Dana Point, Fountain Valley, Fullerton, Garden Grove, Huntington Beach, Irvine, Laguna Beach, Laguna Hills, Laguna Niguel, Laguna Woods, La Habra, Lake Forest, La Palma, Los Alamitos, Mission Viejo, Newport Beach, Orange, Placentia, Rancho Santa Margarita, San Clemente, San Juan Capistrano, Santa Ana, Seal Beach, Stanton, Tustin, Villa Park, Westminster, Yorba Linda,Banning, Beaumont,, Calimesa, Canyon Lake, Cathedral City, Coachella, Corona, Desert Hot Springs, Eastvale, Hemet, Indian Wells, Indio, Jurupa Valley, Lake Elsinore, La Quinta, Menifee, Moreno Valley, Murrieta, Norco, Palm Desert, Palm Springs, Perris, Rancho Mirage, Riverside, San Jacinto, Temecula, Wildomar, Adelanto, Apple Valley, Barstow, Big Bear Lake, Chino, Chino Hills, Colton, Fontana, Grand Terrace, Hesperia, Highland, Loma Linda, Montclair, Needles, Ontario, Rancho Cucamonga, Redlands, Rialto, San Bernardino, Twentynine Palms, Upland, Victorville, Yucaipa, Yucca Valley


Design Windows & Doors, Inc.

See All Reviews
Design Windows & Doors, Inc. is rated 4.9 out of 5 by 61.
Rated 5 out of 5 by from Very pleased What a wonderful crew- because our house is block and the old windows had steel frames it took them 12 hours but they still cleaned up beautifully and were respectful of our space . I loved walking around and easily opening our new windows because our old crank windows were ......cranky!
Date published: 2019-09-12
Rated 5 out of 5 by from Had to get more windows!! I was only replacing the windows that needed to be replaced. After the transformation I order the rest of the windows for my house. I have a custom Log home in Big Bear Lake. All the log trim is hand carved around the windows and doors. I was very worried about the installation, but David came to my rescue!!! David installed my windows like a millwright pro!! Amazing workmanship!! It went so great I felt it time to do all the windows and David is our installer or no deal! Thank you Design Windows !! We love our New Millard windows!!
Date published: 2019-08-01
Rated 5 out of 5 by from EXELENT WORK AND COMUNNICATION! Design windows & doors highly recommend them. VERY professional and so helpful. I am beyond pleased by the work and the staff they ALL did an amazing job. My neighbor is also having Design windows install windows in her home after she saw how great they looked in my home.
Date published: 2019-07-18
Rated 5 out of 5 by from Amazing windows Our windows got installed yesterday, very nice the house looks completely different Beautiful Milgard brand excellent quality so happy with the service
Date published: 2019-07-18
Rated 5 out of 5 by from So Pleased I had my windows and doors replaced by Design Windows & Doors. The Salesman, office staff and the installers were so helpful and knowledgeable and all my questions were answered. They kept my informed and up to date on the progress of my project. I absolutely love my windows! It has made a huge difference. I would highly recommend Design Windows and Milgard to my friends.
Date published: 2019-07-18
Rated 5 out of 5 by from Amazing Windows! Design Windows & Doors have a clean and professional staff. I'm very satisfied with the quality of the windows and the price. I highly recommended them.
Date published: 2019-07-10
Rated 5 out of 5 by from Top-Notch Contractor I’ve ordered various windows and slider doors from Millard through Design Windows and am surprised with their speedy and honest customer service. 5/5 stars.
Date published: 2019-06-27
Rated 5 out of 5 by from Excellent Product Amazing Install and Service Just had my home beautified with new Milgard Tuscany windows and could not be happier the entire process from the office to the installers!!’ Will definitely recommend
Date published: 2019-06-27
Rated 5 out of 5 by from Great window and door had a window and door installed at our house what a difference we are seeing cuts down the heat in the summer
Date published: 2019-06-27
Rated 5 out of 5 by from Beginning with Mike and ending with Pete and Sean the installers my experience with Design Windows and Doors was great! I can't say enough about the professional quality of this company. Everyone I dealt with with was knowledgeable, willing to listen to my concerns and answer all my questions. The timeline described to me was followed and the installation went quicker than I expected. I tend to worry about the small things, but Pete and Sean put my mind at ease and did a great job installing my beautiful windows. Can't wait for the next phase!
Date published: 2017-12-08
Rated 5 out of 5 by from Good Job Design Windows and Doors did a nice job on replacing all the windows in our house even though it was a long way from Ontario
Date published: 2017-06-09
Rated 5 out of 5 by from Awesome job!!!!!! The sales person right down the line to the installers were courteous and professional. Very pleased with everything and would strongly recommend to anyone looking for Windows and doors..... Robert Paprocki
Date published: 2016-12-09
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
Rated 5 out of 5 by from Great experience. Had French sliding door and an entry door installed. Great experience. Quick, on time. Workers very friendly. Cleaned everything up, no mess. My neighbor is contacting you this week.
Date published: 2016-06-14
Rated 5 out of 5 by from 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.
Date published: 2015-12-04
Rated 5 out of 5 by from 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
Date published: 2015-11-24
Rated 5 out of 5 by from 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.
Date published: 2015-08-26
Rated 4 out of 5 by from 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.
Date published: 2015-08-08
Rated 5 out of 5 by from 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.
Date published: 2015-07-20
Rated 5 out of 5 by from 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!
Date published: 2015-07-03
Rated 5 out of 5 by from 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.
Date published: 2015-07-01
Rated 5 out of 5 by from sales order number 1635638 This latest project was my second with Design windows, and doors. they came through, as usual, on all fronts. Very professional, on time, courteous, competitive pricing, and all items were completed successfully, per our agreement. I hope to use them again on future projects. The personnel are excellent, personable, from Fausto, Michelle, Tina, Leah et al.
Date published: 2015-06-25
Rated 4 out of 5 by from Great Installers I just got 10 Windows and 2 sliding doors installed in my condo. The installers were very nice and they got it all done within 2 days. The Windows look awesome, they appear to be sealed very well. They were good about cleaning up after themselves and communicated very well. I'm happy with everything and would recommend Design Windows.
Date published: 2015-06-11
Rated 5 out of 5 by from The overall experience from the assessment to installation was excellent. My experience with design windows and doors from start to finish was a good one. The initial assessment was thorough and professional, the engineer was courteous and informative, the process wasn't time consuming. The installation crew was 45 minutes early completely skilled and knowledgeable and efficient and the windows are fantastic.
Date published: 2015-05-14
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