also: べっとう
separate building; outbuilding; outhouse
Refers to a building that is physically detached from the main building on the same property. Can be used for annexes, sheds, or separate wings. The gloss 'outhouse' here means a separate small building, not necessarily a toilet.
Please use the meeting room in the separate building, not the main building.
この旅館には別棟の露天風呂がある。
This inn has an open-air bath in a separate building.
We built a separate building in the garden and made it a study.
This inn is divided into a main building and a separate annex.
My grandfather lives in the separate building.