Well the easiest way to measure is with a tape measure across the deck.
If you are talking a normal walk through door they are max 36"
if the deck is off the tractor it will fit through any door easily standing it on its side.
Now getting the tractor through the door is a whole different ball game.
But I'd be more concerned getting it down the basement steps!
Might be easier to get a small portable outside tarp shed.
Shelter logic at tractor supply makes nice ones inexpensively
