About Dominion Building Products Dominion Building Products provides Assembled Commercial Doors, Aluminum Windows, Canopies and related accessories to the pre-engineered building industry. Whether the building has Metal Walls, Masonry or Partial Masonry, Composites, or other; we not only have the products specifically designed for the wall type, but also the framing and mounting systems for secure and efficient installation. In addition we have fire rated doors and our newest addition, tested and labeled Wind Rated doors for Metal Walls - the first of their kind. Dominion Building Products continually sets the standard for excellence in the industry because Dominion is the only door and window manufacturer that is dedicated solely to this industry. We are the preferred single source supplier of preassembled and knock down door systems for Metal Buildings; but we go beyond by providing any special door, frame, or hardware component necessary to complete the metal building project. We also provide a similar benefit with windows. Both thermal break or non thermal break windows can be supplied in a preassembled or knock down fashion with sizes, types, and options too numerous to mention. We are truly your Partner for Excellence. What does opening a door mean to you?