German barn conversion by Thomas Kroger Architekt, photo by Thomas Heimann | Remodelista. The brick-paved great hall is cathedral-size in scope with two stories of rooms around it. Explains Kröger: "The space is designed so that the great hall is unheated and surrounded by an enclosed and heated body of rooms. So for the cold season, only the smaller and more sociable areas of the house can be used, like birds' nests."