Our Services

Replacement Windows & Patio Doors

Cornerstone is proud to install vinyl and fiberglass replacement windows and patio doors from the industry’s premier suppliers, Simonton and Milgard. Both companies have exceptional warranties, including a double lifetime warranty. Please ask for more details.

Custom Entry Doors

Cornerstone offers a wide selection of custom entry doors. Whether you prefer the elegance of a classic design, the vintage feel of a craftsman or the the clean lines of a modern, Cornerstone helps homeowners achieve the look they want for the front of the home.

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

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

Cornerstone Windows banner - Serving the South Bay for 25 years

We’re happy to report that due to a large backload of installations, we’re unable to contract any new business until late April 2024. We will start returning emails and phone calls on April 29th.

If you’re a current customer with an installation date, please leave a short message and someone will return your call promptly.

Cornerstone Windows & Patio Doors

Request a Callback

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