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. Stairs, generally modular, need stairs attached to allow access for Sims and pets.

Players can choose either a decking foundation, a patio foundation, 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 require stairs. It may or may not create and define contained content on it as within a "room".

In The Sims 4, foundations can be dragged to any height. Buildings that aren't connected to each other can have different foundation heights, or no foundation at all. To adjust foundation height, one can simply select any room and drag the widget in the center.