Window Replacement Experts
Window Replacement Experts
All products expertly installed
Cornerstone Windows has been servicing South Bay homes for over 25 years, specializing in retrofitting windows into existing frames with no dry wall or stucco damage. Most projects take only one day. We do not use subcontractors and are licensed, bonded and insured.
New windows and patio doors also offer noise reduction, increased security, and improved insulation. Dual pane, energy efficient, low-e glass reduces ultra violet rays from entering your home, reducing heat in the summer, and adding extra insulation in the winter.
Cornerstone Windows is proud to install vinyl and fiberglass replacement windows, patio doors, and french doors from the industry’s premier suppliers, Simonton, Win-Dor, and Milgard. Ask for warranty details.
Owner Tony Szik Explains The Difference And Highlight Features Of Double Hung And Single Hung Windows!
Cornerstone uses only full-time employees. There are no sub-contractors. This maintains a high level of quality control and a seamless installation process. Most jobs are completed in one day!
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.