outbuilding
US /ˈaʊtˌbɪl.dɪŋ/
UK /ˈaʊtˌbɪl.dɪŋ/

1.
dependencia, anexo
a building separate from a main house
:
•
The property includes a main house and several outbuildings.
La propiedad incluye una casa principal y varias dependencias.
•
They converted the old outbuilding into a guest cottage.
Convirtieron la antigua dependencia en una casa de huéspedes.