It's 2,000 square feet so I had a two bedroom apartment built. The apartment also has a full kitchen, living room, dining room and full bath. Then there is also a door leading off the apartment leading into the furnace room. In the furnace room is the furnace, oil tank, hot water heater, water softner unit, the 5 zone heat control levers and the main utility box. Also a workbench and some tools.
My reference library, a bunch of my wife's craft stuff, a "tool room" full of junk (and some tools), our laundry room, a bathroom, some camping gear, and, most importantly this time of year here, Storm Shelter Supplies (some bottled water, flashlights and radios with good batteries, first aid kit, etc.)
I wish I had a basement, they are too lazy here in Ireland to dig the hole in the ground so all we get are feck' attics to deal with. Can you believe that our water tanks are in the attic? I would love love love to have a basement.