How do you add a stroey to your house on sims 1?

Answer:
Go up a story via the button at the bottom menu, add walls on top of the bottom floor walls, add a floor, and make sure to have stair or a teleporter to get up there.
First answer by SmileBunni. Last edit by SmileBunni. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 2 [recommend question].