
Go to the ground floor level above the basement and select the stairs you want. You add this by going to the foundation level and dragging out the basement shape.Ģ. Use the Basement tool in the build mode for your house to add the basement. The ground floor level - the level your sims walk around on.ġ. The foundation level - the area which looks like grass under your house.ģ. The basement level - created using the Basement tool in build mode for your house.Ģ.

Hopefully this will save some of the rest of you the hassle.īefore we start it's important to talk about the three levels.ġ. I eventually discovered how to do this correctly using just two steps. This proved immensely counter intuitive - with articles on the net talking about cheats or small steps down to foundation level.

My daughter and I had recently been struggling with how to put a basement into an existing house with a foundation - and more specifically putting in the stairs.
