Why Cornerstone Windows & Patio Doors
All we do is replace windows & doors!
Installing high-quality replacement windows and patio doors improves your home’s beauty, minimize outside noise, and reduce heating and air conditioning bills.
Here’s why Cornerstone is different:
- Serving the South Bay since 1999
- Owner, Tony Szik, has over 40 years of contracting experience
- Fully licensed, bonded, and insured
- NO subcontractors – only Cornerstone employees
- Products are purchased directly from the manufacturer – no middlemen
- All windows & doors are custom manufactured to fit your home
- Practicing all Covid -19 health and safety protocols required by the CDC and local health departments, including social distancing, masks, gloves, and sanitizing procedures
We offer a large selection of high-performance products in the following categories:
- Vinyl Windows
- Fiberglass Windows
- Aluminum Windows
- Exterior Doors
- Patio Doors – swinging & sliding
Our commitment spans from everything to the value of our products to the craftsmanship of installation.