First, you go to build mode. Then you click the icon on the far left in the first row. It looks like a staircase. Then, you chose the type of staircase you would like, and place it in your sims' house wherever you want it to go. Just make sure that it fits before you place it!
Chat with our AI personalities
Unfortunately, you can't actually build stairs/upstairs for the sims on ps2 :'( get the sims 3 or the sims 2 (computer version(s)) to do this. Both work on pc, but only sims 3 works on mac :)
You can get stairs in the sims 2 for the PC! :]
well i think you cant because i have neverseen a two story house on the sims three so you cant build stairs
go to the build mode and when you do the base of the house, there should be a small picture of stairs, if you click on that, it will bring up the stairs.
you buy elevators in the build section where you buy the stairs.