Cornerstone Building Brands, Inc.
Exterior building products, windows, siding, doors, and metal panels.
Cornerstone Building Brands is the largest manufacturer of exterior building products for the North American residential and commercial construction markets, producing vinyl windows and doors, vinyl and metal siding, manufactured stone, metal roofing, and wall panels. The company was formed through the merger of Ply Gem Holdings and NCI Building Systems, and now operates more than 65 manufacturing facilities across the US and Canada. Its portfolio of brands includes Ply Gem, Simonton Windows, Prime Windows, Royal Building Products, and MBCI metal buildings, serving new construction and remodeling channels.
- Type
- Manufacturer
- Location
- Cary, NC, United States
- Founded
- 1948
- Website
- cornerstonebuildingbrands.com
- Categories
- Building & Construction Materials, Plumbing, HVAC & Fixtures
- Markets
- United States, Canada
Verified facts
- domain-registered (green), checked 2026-08-08 Domain registry record
- lei-active (green), checked 2026-08-23 GLEIF global LEI register (golden copy)
- sanctions-clear (green), checked 2026-08-08 OpenSanctions
- corporate-mail-on-domain (green), checked 2026-08-08 Mail server of the company domain
- debarment-clear (green), checked 2026-08-08 OpenSanctions
Claimed certifications
- ISO 9001, Quality Management IAF CertSearch
Import rules for these goods
- Construction products sold in the EU need a Declaration of Performance and CE marking under the Construction Products Regulation. European Commission (CPR)
- Cement and steel components imported into the EU fall under CBAM (definitive regime from 1 Jan 2026). European Commission (CBAM)