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. 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. As of patch 81, a stilted foundation was introduced in the game.
The Sims 2
In The Sims 2, the foundation spans to the very low depths of the lot, as it can be seen when lowering terrain or creating a pond around the structure.
|Foundation||§4||This is where it all begins. With a strong foundation, you can build a home that will last your Sims for generations.|
|Diagonal Foundation||§4||The same strong foundation with a slant, create angles never before thought possible.|
|Latticed Deck||§3||The Perfect solution for all your deck needs. Create an exciting entry way patio or extend a deck off of your second story!|
|Diagonal Latticed Deck||§3||For classic corners and amazing angles, this is the way to go.|
|Column Deck||§2||Sturdy wooden columns support this beautiful deck that your family can enjoy for years to come.|
|Diagonal Column Deck||§2||With this new diagonal marvel, it's easy to build a deck around the angles of any house.|
|confirmation needed]||Split-Level Interior Foundations||§5||Take your interior design to the next level with split-level interior foundations. Step up to the challenge!|
|confirmation needed]||Diagonal Split-Level Interior Foundations||§5||Much like the interior foundations, but now with more possibilities and angles.|