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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[TS2][TS3]. 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, an elevated foundation, or a brick foundation.