Staircase

Staircases are Build mode objects which allow Sims to travel between different floors on residential or community lots. A basic straight staircase is one square wide, five squares long on the lower level, and four squares long on the upper level. These spaces must be left clear both above and below. The first square on the lower level and the fourth square on the upper level is reserved for the landing, and players may place a floor covering on these squares.

The Sims: Unleashed, The Sims: Makin Magic, and The Sims 2: Apartment Life add spiral staircases. They have a 2x2 footprint on both levels, along with an extra square on each level that's reserved for the landing. This saves space, and allows players to add upper floors to smaller houses.

Superstar and The Sims: Makin' Magic have sweeping staircases, which go through a 90-degree curve from top to bottom.

In The Sims: House Party, there is also the Anti-Heisenberg Teleporter, which serves the same purpose, but has a one-square footprint. Players with Unleashed or a compilation which includes it should note that dogs and cats cannot use this object or objects based on it.

The Sims 2: Open for Business allows players to add elevators to lots.

In addition to the basic staircases, The Sims 2 adds porch stairs with matching side railings. Porch stairs can be used on uneven terrain at almost any height, though their normal height is the same as that of the foundation. Three porch stairs equals the height of one staircase.

In The Sims, only one Sim at a time can use a staircase. though there are hacked staircases that get around this. It is not unheard of for staircases in The Sims to get "stuck", and become unusable because the game considers them to be in use. The way to fix that is to use the move_objects cheat to delete the stairs, and then to buy new stairs. In The Sims 2, several Sims can use a staircase at the same time, though it appears that there are still some limits.