noun
A simple building used for storing farm equipment, tools, or goods; not a livestock barn.
農家の納屋には古い農具がしまってある。
Old farm tools are stored in the farmer's shed.
納屋を片付けて物置に使っている。
We cleaned out the outbuilding and use it as a storeroom.
Compound of 納 (storage) and 屋 (building). The exact historical derivation is straightforward; the word has been used for storage sheds since at least the Edo period.