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.