My guess is the banks and insurance companies will be the driving force to get the inspection and the builder will be responsible for hiring their own inspector who can sign off on their project. I really doubt rural counties will start doing inspections without any mandate or funding from the state.
ICC certifications can't hurt anyway, (except monetarily) but then it will be good marketing info.

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002