2015 IRC section 106 speaks to construction documents. In Massachusetts we allow anyone to design 1 & 2 Family homes, under the prescriptive allowance of the code. If the design or structural element fall out side of the prescriptive tables then a RDP needs to deal with those elements.
We have separate licensing provides of those who construct for hire, however we allow the home owner who intends to live in the home to act as the general contractor, assuming responsibility for compliance with the code.
As Mark K sated it would be up to the jurisdiction and laws to amend the code requirements and set licensing of trades persons.
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