This chapter reveals the architectural remains recovered at Fort St. Joseph. Unlike other colonial settlements, no detailed maps, drawings, or descriptions have come to light to illuminate the physical appearance of the fort. Here, we trace the origins of French colonial architectural styles and how they were adapted to the New World. We then employ archaeological and documentary sources to ascertain the types of buildings that may have existed at Fort St. Joseph, their functions, and what they may have looked like. This information will help in our interpretations of the function, construction techniques, and materials used to construct buildings as revealed through the architectural remains and associated structural materials found at Fort St. Joseph. This examination of eighteenth-century buildings in New France provides a better appreciation and understanding of colonial architecture and the conservative nature of French building practices.