As the story goes, kitchens burned down a lot and it was easier to rebuild your kitchen than your whole house. While fear of fire may have influenced some people, if it were the main reason for building separate kitchens, how come only the people living in southern colonies feared fire? Separate kitchens were not a common feature in northern colonies; they were very common in the south.
Actual reasons have more to do with the heat and odors from the kitchen fire, which in the south would not have been welcome most months of the year. Early on, many southern houses had basement kitchens. Hugh Jones, a mathematics teacher at the College of William and Mary noted in 1724 in his book, The Present State of Virginia, that planters often kept their “kitchen apart from the dwelling house, because of the smell of victuals, offensive in hot weather.” Another reason was the desire to segregate kitchen slaves from the family’s main living space. Cooks and other kitchen slaves often lived above the kitchen and worked there all day.