It's pretty rare to have a house, or a building, build on bedrock in the Bay Area. As a contractor with a foundation that settled it's nerve racking. That sai

It's pretty rare to have a house, or a building, build on bedrock in the Bay Area. As a contractor with a foundation that settled it's nerve racking. That said, very few foundations that settle need to be repaired. The average homeowner thinks the opposite though. I stopped my settling by draining mine, and the neighbor's roof downspouts to the street. Even without that fix, I doubt my house would have settled further. It's true that most buildings/houses settle.