84 Lumber is an operated American building materials supply company. Founded in 1956 by Joseph Hardy, it derives its name from the unincorporated village of Eighty Four, Pennsylvania, a census-designated place 20 miles south of Pittsburgh, where its headquarters are located. In 1992, Joe Hardy's daughter, Maggie Hardy Knox, took over as president of the company. Within her first year as president, the company reached $1 billion in revenue for the first time in history.
As of June 2020, 84 Lumber owns and operates over 250 stores in 30 states throughout the country; the company has more than 5,600 employees and generates in excess of $3.9 billion in annual revenue. Today, it is the largest privately held supplier of building materials to the construction industry.
The company operates components plants, door shops, installation centers and wood products shops. In 2020, it expanded to kitchen and bath design services with the opening of more than 30 design studios within its existing stores. The company's stores carry a variety of materials including siding, decking, windows and trim, roofing and trusses.