The company began in Windsor Heights, Iowa, hence the name Windsor Windows & Doors. Windsor remained a regional window company until 1987 when it was purchased by Woodgrain Millwork of Fruitland, Idaho. Woodgrain Millwork is the largest manufacturer in the U.S. of prefinished mouldings and interior pine doors. It has operations in 17 plants in 13 states and South America. Windsor is now one of four Woodgrain divisions.
Woodgrain Millwork launched Windsor into the national manufacturer of windows and doors that it is today. In 1992, Windsor took another step toward expansion with the purchase of a window plant in Monroe, North Carolina. The Iowa plant now serves customers west of the Ohio River and the North Carolina plant serves customers in the eastern and southeastern United States.