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I am very sorry to hear about this situation.
Yes, someone in your situation may have a case. NC has a law that new homes are built to be habitable and constructed in a workmanlike manner. The owner has 8 years to bring suit against the builder for defective or unsafe construction.
So yes, there may be a case. The hard part is tracking down the party.
If they never had a corporation, then the person himself/herself may be sued outright.
If they had a corporation but simply walked away from it (and the corporation was then voided by the state for non-payment of taxes or filing of proper yearly paperwork), then the person himself/herself may be sued outright under the doctrine of piercing the corporate veil.
If they had a corporation and properly "wound it up" (meaning closed it), then (a) the corporation may be reopened to be sued possibly depending on when they closed it, and (b) the person behind it may be sued still possibly and/or any assets that can be traced back to having been belonging to the corporation may be attached to judgment.
I would talk to counsel face to face. It is definitely worth exploring.
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