Who is Michigan Barndominiums? Michigan Barndominiums is a division of Trademark Building Company Inc. A custom home building company located in Troy Michigan. Our goal is to provide high quality design- build services to clients who want to realize their vision of a custom home. What are Barndominiums? A barndominium is an open concept building that combines living space and a working area. The term can be used to describe any structure from a simple one story to a large, luxurious home.