Foundation

Foundation is an architectural object in The Sims 2, The Sims 3 and The Sims 4.

Foundations are used to raise the level of the main floor and can be used over uneven terrain. In The Sims 2, unpatched versions of The Sims 3 base game, and The Sims 3 for console, foundations are required for the construction of basements.

The foundation tool is used by clicking and dragging an a square area on the terrain. There is also a diagonal foundation tool.

Players can choose either a decking foundation, a patio fandation, an elevated foundation, a foundation for a stage or a brick foundation. With the Late Night patch of The Sims 3, a new platform tool is introduced. It allows a player to create a flat elevated by a half-inch floor surface for Sims to step on. Unlike the foundation tool, it doesn't confine a space and define it as a room.

The Sims 4
In The Sims 4, buildings that aren't connected to each other can have different foundation heights, or no foundation at all.

To adjust foundation height, simply select any room and dragging the widget in the center.