Outbuilding
/ˈaʊtbɪldɪŋ/
Definition 1 of 1
Pro Tip 1/3Physical Separation
Outbuildings are not physically connected to the main house or structure. 
The gardener stores tools in the outbuilding behind the main villa.
Pro Tip 2/3Functional Use
Outbuildings often have a specific use, such as storage or housing animals. 
Their outbuilding serves as a greenhouse for orchids.
Pro Tip 3/3Varied Sizes
Outbuildings come in various sizes, from small sheds to large barns. 
The large outbuilding on the farm can hold all the tractors.