Whenever I hear people talking about replacing the foundation, I usually hear about the expense of jacking the house up costing an extra ten thousand or thereabouts. I've wondered why it's not possible to replace the foundation walls 1 or 2 at a time and replace the floor with the last wall? Wouldn't this eliminate the need for the ten thousand dollar expense of jacking the house up? From my understanding, when a wall is being replaced, they put support jacks under the beams to hold the house up then demolish and build a new wall with new footings. Is that correct? Is there a risk in the foundation not being level by doing it this way? Am I missing something?