Harold:
You're opening a can of worms.
HO of a single family, owner occupied dwelling can do plumb & elec. It's their responsibility. However the CO or appropriate subcode can request 'information' relative to the proposed work; per UCC 5:23-2.15(a)5. And, if anyone (AHJ) wants to push the envelope to the legal limits; the HO that signs the tech card and more importantly the folder certification section (C3/C4) false statement clause; that is a criminal action.
I will add that HO inspections are a pita. False claims, 'he/she' said it was OK; out & out lies; 'I paid him good money'; etc.
IMHO, worse that HO permitted work....is 'As-Built' situations...basement finishes, etc. But that's another topic
