121 reviews

Exactly as described

Just replaced the kitchen window and slider, but what a difference! Glad to be rid of the 1980's look. Nice/polite/quiet installer did a great job.

Seamless Installation

The installation crew used by Design Windows was amazing! I had some of my windows cut down to make them a little bigger and had some concerns about how that would go since I have an older home. The crew did a beautiful job reframing the windows and making them look perfect! I was also surprised at how quickly the whole job was completed. Call Design Windows and you will not be disappointed!

New look

Our project from design windows was Amazing!!! The project Manager keep me updates all the time since the 1st day. Windows, patio slide door and shutters installation crew were so polite, careful with our furniture and most of all NO mess after the job was done!!!! I'm totally in love with the new look of my house. 😊


I was in the process of selling my house , and one the buyers final request was to have 5 windows replaced. We had very old windows and very little time to remedy the problem. Thankfully JR from Design windows came to the rescue and in a period of a week . He was able to ordered new windows and they where installed right by the time that escrow closed. Everything was done on time and work was professionally done.

Amazing Windows

We love our new windows and the process from start to finish was a breeze. We recently purchased our home and the original windows were in desperate need of replacing. We were nervous about the process because as first time home buyers we have absolutely zero experience with replacing windows. But from day one we felt taken care of and confident that everything would come out great. Design Windows kept us updated through the entire process and installation was prompt and stress free. Now every time we come home we are immensely pleased because the new windows completely changed the look and feel of our home.

Love our new windows!

From start to finish getting our new windows was a breeze. The day of installation was timely and done in a prompt manner. We highly recommend Design Windows Inc. for all of your window needs.

Great New Slider

I had my sliding glass door replaced. Had a wonderful time with the estimator, the installation crew was excellent (clean, neat, professional) and the office personal were kind and easy to work with. Great experience, great price, great door. Thank you!


My overall experience was great! We love our new windows and slider. I was very surprised at how fast the whole experience was. From the moment a representative came to give us an estimate to completion it surpassed our expectations.

Great Job

Everyone we dealt with was professional and courteous. The installers took their time and kept everything clean. The windows are beautiful much better than the ones we purchased prior from another company. If we had more to do would definitely go back to Design Windows and Doors.

New slider!

After a rocky start (estimator missed my appointment) we were able to come together and agree on a replacement sliding glass door. All of the staff are kind, considerate and true professionals.Everything went as well as possible. I highly recommend this company.

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4.9 out of 5
based on 121 Reviews
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Design Windows and Doors - Office Design Windows And Doors

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