outhouse

puusee, kuivakäymälä, puucee, ulkohuussi, ulkorakennus puhekieltä An outbuilding—typically permanent—containing a toilet or seat over a cesspit.
puhekieltä any Any outbuilding: any small structure located apart from a main building.
(RQ:Orwell Animal Farm)

(..) plenty of sand and cement had been found in one of the outhouses