Permit to replace rotten wood in balcony

[Shiv Panda]

This is my first time in BP and forum. Thanks to BP for having such a forum available for this community. 

I own a multi-family property with seven units, and the building features a wooden balcony. Recently acquired, the balcony is in poor condition, characterized by aged and rotted wood. My intention is to address this issue by replacing all the deteriorated wood with water-treated alternatives. The necessary repair work is confined to the balcony floor.

Upon consulting with the town inspection department, it was advised that a permit is required for this project, and it must be obtained through a licensed contractor. Subsequently, I obtained estimates from licensed contractors, but the costs were significantly higher—3 to 4 times more—than those provided by non-licensed carpenters. I recognize that others may have faced similar challenges in this regard and would appreciate any recommendations or insights you can offer. Thank you in advance for your assistance!