You could ask the inspector to explain how he interprets the code to require this.. Maybe the head of inspections might be able to better explain the requirement or tell you that it isnt required. But most likely your town has at some time passed an ordinance that requires the RPZ. They are within their rights to pass an ordinance and make you comply even if it isnt in the state code book. Different inspection jurisdictions have different rules due to local ordinances (thats one thing that makes working in different counties and cities extra fun!). First place I would go is to the inspection department and ask a few questions.