GCS Glass & Mirror where Quality Matters. Our company was built on the idea that customers deserve a quality product that is individualized to fit their style and needs. When dealing with shower doors and custom glass it’s important to pay attention to the details and that exactly what our team has been trained to do. GCS utilizes every team member to develop new products and advance existing ones. Founded in 2013 by Brandon Nicastro GCS has had a tremendous amount of success. This is due to our “Can Do It” attitude along with our innovative approach to every aspect of business. Our reviews have proven that GCS is an Elite supplier/installer of any glass products. Formerly Grand Canyon State Glass Design. WE ARE GCS!