Cornerstone Building Brands Headquarters & Corporate Office

About Cornerstone Building Brands

Cornerstone Building Brands, Inc. is one of the largest manufacturers of exterior building products in North America. The modern company was created through the November 2018 merger of NCI Building Systems, a major commercial building-products manufacturer, and Ply Gem, a large residential exterior-products company. The combined organization brought together well-established operations in windows, siding, roofing, metal buildings, stone veneer, wall systems, accessories, and other building-envelope products. In 2019, the combined company adopted the Cornerstone Building Brands name to represent its broader residential and commercial building-products portfolio.

Today, Cornerstone Building Brands serves residential and low-rise non-residential construction markets through new construction and repair-and-remodel channels. Its portfolio includes vinyl windows, doors, vinyl siding, manufactured stone veneer, metal roofing, metal wall systems, gutters, trim, shutters, fencing, railing, metal buildings, and related accessories. The company operates through a large collection of established brands, including Ply Gem, Simonton Windows & Doors, Mastic by Ply Gem, Variform, MBCI, Mueller, American Building Components, and other product lines. Current company information describes more than 18,800 team members working across manufacturing, distribution, and office locations throughout North America.

Cornerstone Building Brands underwent a major ownership change in July 2022 when funds affiliated with Clayton, Dubilier & Rice completed the acquisition of the company and took it private. Cornerstone’s shares ceased trading on the New York Stock Exchange following the transaction. The company nevertheless continues to file certain regulatory reports because of outstanding debt securities. Current October 2026 SEC filings continue to identify 5020 Weston Parkway, Suite 400 in Cary, North Carolina as the principal executive office, confirming that Cary remains the company’s headquarters under CD&R ownership.

Cornerstone Building Brands Headquarters & Corporate Office Address

Current Headquarters

Cornerstone Building Brands, Inc.
5020 Weston Parkway, Suite 400
Cary, NC 27513
United States

Current 2026 SEC filings identify this Cary address as Cornerstone Building Brands’ principal executive office. It remains the correct headquarters address following the company’s transition from a publicly traded corporation to private ownership.

Corporate Office

5020 Weston Parkway, Suite 400
Cary, NC 27513
United States

The Cary corporate office supports executive leadership, finance, legal, strategy, human resources, marketing, information technology, corporate communications, product management, procurement, and other enterprise functions.

Mailing Address

Cornerstone Building Brands, Inc.
5020 Weston Parkway, Suite 400
Cary, NC 27513
United States

Current regulatory filings use the same Cary address for the company’s principal corporate office. Product-specific warranty and customer-service correspondence may use different addresses associated with individual brands.

Other Important Address

Cornerstone Building Brands operates a large network of manufacturing plants, distribution facilities, branch locations, and offices throughout the United States, Canada, and Mexico. Customers with warranty, product, delivery, or installation issues should normally contact the specific brand or business unit responsible for the product.

Quick Information

Corporate Phone Number

866-419-0042

This is the current verified telephone number listed with Cornerstone Building Brands’ principal executive office in its 2026 SEC filings.

Customer Service Number

Public verified universal customer-service number not available.

Cornerstone Building Brands operates numerous brands and product divisions, and customer support is generally handled through the specific window, siding, metal, stone, or other brand involved.

Corporate Office Address

5020 Weston Parkway, Suite 400, Cary, NC 27513, United States.

Headquarters Address

5020 Weston Parkway, Suite 400, Cary, NC 27513, United States.

Email

response@cornerstone-bb.com

This address is currently published for Cornerstone Building Brands corporate communications. Product and warranty matters should use the customer-service channel for the applicable brand.

Industry

Exterior building products, windows, siding, roofing, metal building systems, stone veneer, doors, construction products, and manufacturing.

Founded

Cornerstone Building Brands was created from the 2018 merger of NCI Building Systems and Ply Gem and adopted its current corporate name in 2019.

Number of Employees

More than 18,800 team members across manufacturing, distribution, and office locations in North America.

Ownership

Cornerstone Building Brands has been privately owned by Clayton, Dubilier & Rice affiliated funds since July 2022.

Corporate Office Hours

Public visitor hours for the Cary headquarters are not prominently published. Customer-service hours vary by brand and product division.

Website

https://www.cornerstonebuildingbrands.com/

Careers Page

https://www.cornerstonebuildingbrands.com/careers

Cornerstone Building Brands is privately held and no longer maintains a traditional public-equity Investor Relations function.

Cornerstone Building Brands Products & Services

Vinyl Windows

Cornerstone Building Brands manufactures vinyl replacement and new-construction windows through brands such as Ply Gem and Simonton. Products are designed for residential construction, renovation, energy efficiency, and different architectural styles.

Patio Doors

The company’s residential portfolio includes sliding patio doors and related door systems. Available materials, glass packages, finishes, and efficiency options vary by brand and product series.

Vinyl Siding

Cornerstone is a major North American manufacturer of vinyl siding through brands including Mastic by Ply Gem and Variform. Products are offered in numerous profiles, textures, colors, and performance levels.

Stone Veneer

The company provides manufactured stone veneer for residential and commercial exterior applications. Stone products are designed to provide architectural appearance without the structural requirements of full-depth natural stone.

Metal Roofing

Cornerstone manufactures metal roofing systems for commercial, industrial, agricultural, and residential applications. Products include exposed-fastener and standing-seam systems in multiple profiles and finishes.

Metal Wall Systems

Commercial building customers can purchase insulated and non-insulated metal wall panels used in warehouses, industrial buildings, retail properties, institutional facilities, and other structures.

Metal Building Systems

Cornerstone’s commercial brands provide engineered metal building systems for warehouses, manufacturing facilities, agricultural structures, retail properties, and other low-rise buildings.

Metal Accessories

The company manufactures roof and wall accessories, trims, flashings, components, coils, closures, and related products that support complete metal building-envelope systems.

Fence and Railing

Ply Gem branded exterior solutions include vinyl fencing and railing products intended for residential outdoor spaces, porches, decks, and property boundaries.

Gutters and Gutter Accessories

Cornerstone offers gutter systems, gutter coil, downspouts, and accessories through its exterior-products portfolio. Products are distributed to contractors, builders, and remodeling professionals.

Shutters and Exterior Accents

Decorative shutters, vents, trim, mouldings, and exterior accents are available through Ply Gem and related brands to coordinate with siding and window products.

Builder and Contractor Solutions

Cornerstone supports builders, remodelers, architects, dealers, distributors, and contractors with product specification, estimating, technical documentation, installation resources, and project support.

Cornerstone Building Brands Corporate Phone Numbers

Corporate Phone Number

866-419-0042

This is the verified current telephone number listed with Cornerstone Building Brands’ Cary principal executive office.

Corporate Headquarters Number

866-419-0042

The same number is associated with the company’s headquarters at 5020 Weston Parkway, Suite 400.

Headquarters Number

866-419-0042

Corporate and business callers can use this number when they do not already have a division-specific contact.

Corporate Office Number

866-419-0042

This is the strongest current verified general corporate-office number for Cornerstone Building Brands.

Customer Service Number

Public verified universal number not available.

Customers should contact the specific Cornerstone brand that manufactured or supplied their product because warranty and technical-support systems differ by business unit.

Customer Support Number

Varies by brand and product.

Ply Gem, Simonton, Mastic, MBCI, Mueller, and other Cornerstone brands maintain separate sales, technical, warranty, and service processes.

Sales Number

Varies by business unit.

Residential dealers, builders, distributors, and commercial customers normally work with specialized regional or brand sales teams rather than one national sales call center.

Warranty Support Number

Varies by product brand.

Window, siding, roofing, metal-building, and stone products have different warranties and claim procedures. Customers should identify the brand and product before beginning a warranty request.

Media / Press Number

Public verified universal media telephone number not prominently available.

Cornerstone currently directs corporate communications through response@cornerstone-bb.com.

Human Resources Number

Public verified universal HR number not prominently available.

Job applicants should use the company’s current careers portal and the contact information provided with the relevant job application.

Investor Relations Number

Not applicable for public shareholders.

Cornerstone Building Brands became privately held in July 2022 and its common stock no longer trades on a public stock exchange.

Emergency / After-Hours Number

Public verified company-wide emergency number not available.

Facility-specific emergencies should be handled through the applicable plant, branch, contractor, emergency service, or local authority depending on the situation.

How to Reach a Real Person at Cornerstone Building Brands

For a product, warranty, delivery, installation, or technical problem, first identify the exact Cornerstone Building Brands product involved. Look for the brand name, product series, model, purchase documentation, installation contractor, distributor, and warranty information. A Simonton window complaint, for example, should normally be handled through Simonton’s support process rather than by calling Cornerstone’s corporate office.

For general corporate matters, 866-419-0042 is the strongest current verified headquarters telephone number. Before calling, have the company or project name, product brand, order information, manufacturing facility if known, and previous support-case information available so the issue can be routed efficiently.

Contractors, dealers, builders, and distributors should generally use their existing sales or account contacts because these teams can access pricing, orders, delivery schedules, specifications, and project documentation more directly than the corporate headquarters.

How to File a Complaint Against Cornerstone Building Brands

Complaints can involve product defects, warranties, windows, siding, roofing, delivery, installation, commercial projects, contractor support, billing, or customer service. Before escalating, gather purchase records, product labels, photographs, installation information, warranty documentation, invoices, and previous correspondence.

Step 1: Contact Customer Service

Begin with the customer-service or warranty department of the specific Cornerstone brand involved. Provide the product model, purchase date, installation date, photographs, and dealer or contractor information.

Step 2: Contact the Relevant Department

Warranty complaints should remain with the applicable warranty team, while commercial project, metal-building, dealer, billing, or delivery issues should go to the business unit responsible for that product or account.

Step 3: Request Supervisor or Management Review

If the first representative cannot resolve the complaint, request a supervisor, warranty manager, regional sales manager, or appropriate business-unit leader. Keep the original case number and explain what remains unresolved.

Step 4: Use the Company’s Written Complaint Channel

Submit the complaint through the relevant brand’s written contact process or Cornerstone Building Brands’ corporate Contact Us form. Include supporting photographs, receipts, warranty documents, and the requested resolution.

Step 5: Contact Corporate Headquarters

Serious unresolved matters can be directed to Cornerstone Building Brands, Inc., 5020 Weston Parkway, Suite 400, Cary, NC 27513. Include previous case numbers and identify the exact product brand.

Step 6: Use the Specialized Complaint or Dispute Department

Product safety, warranty, commercial contract, privacy, employment, and legal disputes may require specialized review by technical, legal, compliance, or business-unit management.

Step 7: File With the Appropriate Regulator

Building-product safety concerns may involve the U.S. Consumer Product Safety Commission, state building authorities, local code officials, or other regulators depending on the product and issue.

Step 8: Use Consumer Protection or Financial Dispute Options

Homeowners with unresolved product or warranty complaints may contact their state attorney general or consumer-protection agency. Contractor and commercial disputes may instead be governed by construction contracts and state law.

Step 9: Consider Formal Legal or Arbitration Procedures

For substantial property damage, construction defects, warranty losses, commercial disputes, or personal injury, preserve the product, photographs, inspection reports, invoices, warranties, and all communications. Review the applicable warranty or contract and seek qualified legal advice where necessary.