outbuilding

US /ˈaʊtˌbɪl.dɪŋ/
UK /ˈaʊtˌbɪl.dɪŋ/
"outbuilding" picture
1.

a building separate from a main house

:
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The property includes a main house and several outbuildings.
•
They converted the old outbuilding into a guest cottage.
:
annexshedbarngarageouthouse