Serving South Bay homes since 1999, Cornerstone specializes in retrofitting windows into existing frames with no drywall or stucco damage. Most projects take only one day.
Vinyl and fiberglass windows retrofitted into your existing frames. Dual-pane, low-E glass reduces ultraviolet rays entering your home, cuts heat in the summer and adds insulation in the winter.
Sliding and swinging glass patio doors and french doors that brighten your home, improve security and reduce outside noise.
Open an entire wall to the outdoors with folding and multislide patio door systems, precisely measured and expertly installed.
No pressure, in your home or at our Torrance showroom — with a free visual estimate.
We measure every opening so your new windows and doors retrofit cleanly into the existing frames.
Our own full-time crews complete most projects in one day, protecting your home and furniture throughout.
Products include exceptional warranties — including a double lifetime warranty. Ask for details.
Cornerstone’s installation system retrofits new windows and doors into your existing openings, so there is no drywall or stucco repair to schedule afterward. New windows and patio doors also offer noise reduction, increased security and improved insulation.
Most projects are completed in only one day, with no drywall or stucco damage.
Cornerstone 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.
No. Cornerstone uses only full-time employees. This maintains a high level of quality control and a seamless installation process.
Contact us today for a FREE estimate.
