Do everything yourself and it never touches commercial regulations on licensing, inspection, and and building plans. I recorded a sworn affidavit with the county I was building it myself on my own property for purely personal residential use and then they issued me a permit explicitly stating I did not need to submit building plans or inspections.

Since the house was built without any compensation and not used for any commercial purpose, it bypasses "commerce" which was the auspice under which housing was regulated. When I was done I literally just sent the county a picture of a house and they closed the permit and that was that.