Re: How to delete/remove foundations in the Sims 4?
You can't delete a foundation altogether. Even when the base of the building is flat or even with the ground outside, the foundation is still there. But you can raise and lower the foundation using the big double-sided arrow in the center of a room. Just click on a room and grab the arrow and drag down until the house floor is even with the ground outside. You probably don't have to go all the way down, just low enough that there are no stairs.
Hope this helps.
