Customer Reviews

Hear from Our Satisfied Clients

Hear from Our Satisfied Clients

At Cornerstone Windows & Patio Doors, we combine the best window and door products with superior service.

With more than 3 decades of construction expertise, we’ve developed an installation system that eliminates damage to stucco and drywall. Our expert, in-house installers go to great lengths to protect your floors and furniture as they work. Most projects are completed in a single day.

Customers often compliment our installers. We thrive on these wonderful business relationships while serving residents throughout the South Bay and West Los Angeles areas.

Google Reviews

“My wife and I were so impressed with the service and friendly staff that gave us exactly what we asked for. Their helpful professional input and easy demeanor gave us confidence that the job will be done right. The work was done within budget and schedule. We couldn’t be happier! Thank you Cornerstone!”

Tony Szik's Cornerstone Doors & Windows, Inc., Door Installation, Torrance, CA

Transform your home with new windows & Doors!
Contact us today for a FREE estimate

Simonton offers on windows and patio door rebates
Cornerstone Windows banner - Serving the South Bay for 25 years

Cornerstone Windows & Patio Doors

Request a Callback

Cornerstone Windows will be in touch as soon as possible to discuss your project