- 3W Companies
 - Diversified group of national firms that offer commercial construction services, environmental testing and remediation, medical facilities development and financing, and commercial/retail glass services. - Abbe Window
- Manufacturer and exporter of windows, shutters, shower enclosures, sliding glass doors, and more.
- Accu-Weld
- Manufacturers of vinyl replacement windows and doors with distribution throughout the U.S.
- AMSCO Windows
- Offers a wide selection of premium vinyl, aluminium, and wood fibre composite windows and doors.
- Andersen Corporation
- Makers of windows and patio doors.
- Builders Prime Window & Supply
- Provides Pennsylvania, Delaware, and New Jersey area homeowners and contractors with windows, doors, roofing, decking, and more.
- Caradco
- Champion Aluminum Windows
- Manufacturers of thermally broken aluminium windows.
- Columbia Glass & Window
- A window manufacturer of aluminium and vinyl windows, storm doors and windows, patio doors and more.
- Cossins Windows
- Manufactures vinyl, aluminium clad, and wood windows in both standard and custom sizes, plus exterior doors, patio doors, skylites, and sunrooms.
- Gilkey Window Company, Inc.
- Making custom wood and vinyl replacement windows as well as textured steel and fibreglass doors.
- Gorell Windows and Doors
- Manufactures custom windows and doors, including oroducts for lower home energy costs.
- Harvey Industries
- Manufacturer of wood and vinyl windows and distributor of roofing, siding, and decking materials.
- Hy-Lite Block Windows
- An alternative to glass block, prefabricated windows of lightweight acrylic blocks.
- International Window Corporation
- Manufacturer of residential windows and doors constructed of aluminium, wood or vinyl, insulated windows, tub and shower enclosures.
- Kasson and Keller
- Offering a line of replacement and new construction windows.
- Midstate Millwork
- Offers Heartland vinyl, aluminium, and wood windows.
- Milgard Windows
- Manufactures vinyl, aluminium, and wood windows.
- Pihla-ikkunat
- Manufacturer of windows. In Finnish.
- Polaris Technologies
- Manufacturers of high performance glass, doors, solariums, Victorian images gazebos, and more.
- Reynolds Building Products
- Offering a total line of siding, windows, shutters, raincarrier systems, accents, and accessories.
- Sol-A-Trol Products
- Manufacturers of heavy commercial windows.
- Traco
- Manufactures aluminium, vinyl, and composite windows for residential and commercial applications.
- TRYBA
- Manufactures and sells PVC, wooden, and aluminium windows as well as roller shutters and doors.
- Windsor Windows and Doors
- Manufactures wood and vinyl products, as well as sash replacement kits.
- Winstrom Manufacturing
- Producers of commercial and residential, vinyl and aluminium, architectural windows, vinyl replacement windows, speciality windows, storm windows, and storm doors.
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