109 reviews

Nice Job

It was great

We love our new windows

Design Windows and Doors performed as expected. The installers were very professional and clean. We purchased 21 windows and 2 sliders. Milgard Tuscany windows in white are beautiful. These windows are high quality. Our 23 year old house is more quite and dust free and we’ll save energy too.

Job Done Right

The guys from Design Windows came yesterday and installed my new sliding glass door. They were on time and worked very efficiently. The were thoughtful and thorough. I am very pleased with the service I got at Design Windows.

Window Replacement

Great job! Spent one and half day for tenderly replacement of all windows. Clean-up after job that was excellent. All staffs are polite. Totally recommendable company!


My experience with Design Windows and Doors was a very positive one. The company staff and installers were very professional and they made sure that everything was cleaned up after the installation was completed. Also, the company followup with a phone call after the job was completed. I would recommend this company to my family and friends.

Installer & Customer Service

As the product met my expectations so did the installer. Actually Luis and Tony were very exceptional as professionals, knowledgeable and consumer satisfaction. They ran into problems the house presented, informed me ,gave solutions and worked to perfection to resolve the issue. Pre delivery and completion follow up processes were absolutely reassuring that Design Windows took pride in their “commitment to excellence “.

Slider door & windows

Very pleased with the work they do and very satisfied when the job is completed. I also gave them In-N-Burger for lunch and it great joy to see the smile on their face.

Slider Patio Door

The installer was very good and did a nice job. Everyone I dealt with at Design Windows and Doors was very helpful. Love my new door!!!

Slider door

I had a new slider put in and the installer was ver good and courtesy. All the people I dealt with were very nice. Only thing not informed about was that wood trim was being used around trim of slider inside of house and needed to be painted.Other than that great job.

Very pleased!

Our single pane windows from 1952 replaced with wonderful double pane windows. Amy was the one who called me and was so open and scheduled everything. Doors and windows are tricky to replace in old houses and I was concerned! Amy arranged a meeting for me with the owner who was very knowledgeable and he educated us. We did run into some issues with french doors, but it was taken care of no matter how many times it took the crew to pay us a visit. The windows and 2 doors were completed in 2 days! We have a mid century house with 35% windows of all shapes and weird sizes. Very pleased with the result! We did have few more estimates however we realized have we gone with any other company although they were less, but we surely would end up paying more due to change orders. Highly recommend Design Windows & Doors.

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Design Windows and Doors - Office Design Windows And Doors

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