Millwork is any type of woodwork that is produced in a mill. This includes doors, cabinet, molding, trim, flooring, wall paneling and crown molding. Millwork is a wooden product that has been produced in a mill. Millwork can be made from common woods such as pine and oak, but it may also include uncommon woods such as fir, poplar, hickory and maple. Millwork products only need nails, screws or adhesives to be installed, which makes using them easy and convenient.