It is not required and the price varies by how far away you are from a fault line.
And yes, it is cost prohibitive, most people do not carry it.
Our construction requires everything to be pretty solid, so very few people actually ever have any damage.
I am building a house right now, and I swear, if there was anyway to disconnect it from the foundation (impossible!) it would roll down the mountain completely intact! Everything is bolted, welded, and then bolted some more. I also have 2 35 foot tall heavy steel beams in the front.
Fire is a bigger threat in CA then earthquakes.
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