Hi, they dont live indoors , i just fetch them in for an hour or so to play in the kitchen while i am in there, i have heard people say they have had success with litter training them when they live in the house.
I couldnt have them inside all the time as my husband had an allergy to them , well i suppose he could live in the shed & i could move the ferrets in the house ,he may mend the leaking roof on the shed if he had to sleep in there & got wet