Due to the COVID-19 concerns, we will be offering virtual meetings as well as in-home meetings. Simply fill out a form or call (909) 377-4447 to get started.
128 reviews

In with the new, energy efficient, quiet, clean

With the impetus of a broken window and recommendations from two friends, we contacted Design Windows & Doors. Joe came out that Saturday wrote up the order and put it in place at the end of November. By the end of January our 12 Milguard windows and 2 sliders were installed; creating a warmer, quieter, energy efficient, more secure, less dusty home! The professional, capable installers, Edgar, Sal and Umberto arrived promptly, worked quickly and efficiently individually and as a team. We were impressed with their attention to detail, craftsmanship and ability to create and work in an organized workspace. We recommend Design Windows Doors, Inc. without hesitation.

Amazing Job and Customer Service

Design Windows's staff and crew did an amazing job. We were impressed with everyone who took part in this project--from the sales presentation Bill presented to us, and Ray's great customer service, to the final phase of installing the beautiful sliding glass door. Arthur Garcia and Oscar Cosió did their job with great skill and care. They made sure that every single detail met our expectations. The electrical job was a bit of a challenge, but they got it done! I love my new-outdoor light fixture. It was a pleasure meeting with Oscar and Arthur today. They were very professional, prompt and friendly. I would recommend them and Design Windows to anyone who is looking for a great team to do their windows. Thank you so much! It's always a nice day when you make new friends.


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.


Installation was same day, the workers were tidy and cleaned up when they finished. Standing back and looking at the windows they are AWESOME! The color for the outside (brown) matched the painted trim on the existing house and the crisp look of the installation on the inside of the house makes me smile! No mess, just hang my curtains and enjoy! Thank you for a GREAT process.

Great job/

Sal and Edgar did a great job on the installation. They did 9 windows (1 was a patio door) very quickly and professionally. They were courteous and friendly. The cleaned the job site very well. We are extremely pleased. Dealing with the management staff was a breeze. We recommend Design Windows for all you window needs.

Game Changer...

My experience with Design Windows and Doors was stellar... from sales to measurements to order to delivery to installation... Impressive, knowledgeable, professional, clean and very detailed oriented team. Martha was instrumental in keeping me informed on the entire process; communication is key to any project. In terms of quality, Milgard is the standard I'll be sure to endorse in the future... The only challenge I have is that these sliding doors and windows are soooo good, I'll have to spend more money to finish the remainder of my home!

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!

Choose Design Windows!

After getting quotes from several window companies I decided to go with Design Windows and Doors. The initial meeting with Billy from the sales department was friendly and informative, which is expected, but Billy’s approach was so down to earth and without pressure I felt like this was the right company to work with. Martha the project manager stayed in touch with me throughout the process and kept everything moving and on time. Their pricing is very reasonable and I would gladly refer them to anyone looking to upgrade their home!

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. 😊

Let’s Get You A Free Quote

Get Started Now

Request appointment?

4.9 out of 5
based on 128 Reviews
Logo Installation Master
Logo Milgard

Design Windows and Doors - Office Design Windows And Doors

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