Like many of Wright's Usonian style buildings, the floor plan of the Tonkens House mimics the shape of a polliwog. The tail of the polliwog is represented by the bedroom wing, with each bedroom opening off into a long, narrow hallway. The hallway leads into 'the body' of the house, which consists of a bright and expansive living room or Great Room, alongside a kitchen and foyer. The configuration allowed for additional rooms to be added to the bedroom wing in the future. The Great Room was designed as a large, warm and welcoming space, a room in which the family and their guests could gather throughout the day and night.