It includes lumber and other building materials dealers and paint, glass, and wallpaper stores selling to the general public, even if sales to construction contractors account for a larger proportion of total sales. These establishments are known as retail in the trade. Establishments primarily selling these products for use exclusively by businesses or to other wholesalers are classified in Wholesale Trade.

Establishments primarily selling plumbing, heating, and air-conditioning equipment and electrical supplies are classified in Wholesale Trade.