Advice for challenge with building inspector

[Simon Obas]

Hello. Is it legal for the building inspector to not close out a trades permit because another part of the job wasn’t permitted? I’m working on a home and I have not secured a mechanical permit YET. But the plumber did his thing and is ready to close out but the building inspector is saying he won’t do a final plumbing inspection because there wasn’t a mechanical permit taken out. I feel like the inspector is abusing his power. Can he actually do this? What are my rights? Whose his boss, the mayor? Should I get an attorney involved? Any advice is helpful. Thank you.