Cornerstone Windows

Replacement Experts

  • Reduce Energy Bills

  • Improve Security

  • Reduce Outside Noise

  • No Dry Wall or Stucco Damage

  • Torrance, CA Showroom

Cornerstone Windows

Replacement Experts

  • Reduce Energy Bills
  • Improve Security
  • Reduce Outside Noise
  • No Dry Wall or Stucco Damage
  • Torrance, CA Showroom
Cornerstone Windows banner - Serving the South Bay for 25 years

Window & Door Replacement Experts

Your home is a family’s biggest financial investment. Replacement windows, entry doors, french doors, and sliding and swinging glass patio doors are proven and cost effective way to improve your home’s value, beauty, energy efficiency, security and reduce outside noise.

Cornerstone Windows features a wide selection of replacement windows, patio doors, entry doors, and french doors from the industry’s premier companies, including Milgard, Simonton, and Masonite. All products are expertly installed and include exceptional warranties, including a double lifetime warranty. Please ask for more details.

Cornerstone Windows has been in business since 1999 and developed an installation system allowing our installers to complete projects with no drywall or stucco damage. Additionally, most jobs are completed in one day. Protecting your home and furniture during the entire installation process is always a priority.

Cornerstone offers a free, in-home, no pressure consultation.

Our Projects

cornerstone windows employees unload a window from their truck
brand new windows installed

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 are proud to be voted a South Bay Favorite for Windows & Doors in 2022, 2021 and 2020 by readers of the Daily Breeze!

Cornerstone Windows & Patio Doors - 2022 Daily Breeze South Bay's Favorite Window Door Company
Cornerstone Windows & Patio Doors - 2021 Daily Breeze South Bay's Favorite Window Door Company
Cornerstone Windows & Patio Doors - 2020 Daily Breeze South Bay's Favorite Window Door Company

cornerstonewindows

Loading the next set of instagram posts...
Tony Szik's Cornerstone Doors & Windows, Inc., Door Installation, Torrance, CA

Transform your home with new windows & Doors!
Call now or contact us today for a FREE in-home estimate

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