So to do anything on the island (eg: build a house, create a road, build an underground bunker...) he would need to get permission from the Maui County governme

So to do anything on the island (eg: build a house, create a road, build an underground bunker...) he would need to get permission from the Maui County government? Thanks for the info re: Maui, I skipped over the part where it's part of the united states.