Who makes doors and window-frames?

Doors and window frames are typically made by manufacturers specializing in construction materials, including woodworking companies, metal fabricators, and plastic extruders. These manufacturers may produce a variety of styles and materials, such as wood, fiberglass, vinyl, or aluminum. Additionally, some carpenters and builders may custom-make doors and window frames on-site to meet specific design requirements. Major brands in the industry often provide a range of standardized products for residential and commercial use.