Contact Cornerstone Windows

To Our Valued Customers:

Effective immediately, Cornerstone Windows is complying with the statewide mandate to temporarily close all non-essential businesses until further notice, currently scheduled for 4/20/20.

On behalf of myself & all Cornerstone employees, Thank You for your understanding during this unprecedented period in our country’s history. Cornerstone values every customer and we look forward to getting back to work soon.

Stay healthy. Stay Safe.

Tony Szik-Owner, Cornerstone Windows

Our Showroom

Cornerstone transforms homes with our large selection of:

  • Windows: High quality vinyl and fiberglass replacement windows
  • Sliding and swinging patio doors
  • Exterior Entry Doors

Our Cornerstone Showroom is Open

  • Monday-Friday: 9:00 a.m. – 5:00 p.m.
  • Saturday: By appointment only
  • Sunday: Closed

Contact Us for a Free In-Home Estimate

At Cornerstone, our expert estimators, office personnel, and installers are committed to providing skilled and satisfying service. We feature competitive pricing on all of our highly crafted products.  Increase the beauty, value, security and improve energy efficiency of your home with new windows & doors. Please submit your contact form for a free, in-home estimate. We’re also available on weekends by appointment only.

Location: 3545 Lomita Blvd, Unit A, Torrance, CA 90505

Cornerstone Windows Patio Doors - 3545 Lomita Blvd Unit A, Torrance, CA 90505 - Truck Fleet









Tony Szik's Cornerstone Doors & Windows, Inc., Door Installation, Torrance, CA
Cornerstone Windows - 2019 Daily Breeze South Bay's Favorite Window Door Company