Permit for room and bathroom addition Bloomfield Anh

Hi all

I just bought my first house hacking property in bloomfiled NJ. It is a single family home in a legal 2 family zone with 2 floors and an attic. I plan to live on first floor and rent out the second Fl and attic . Second floor only has bedrooms so I want to do 1) an extension on the second floor and 2) add a bathroom and potentially a 3) kitchen.

I called town office and was told to submit an original survey and a drawing of new layout plus $40 processing fees. 

My questions are

1) how much does it cost to pull permit to a) add room b) add kitchen c) add bathroom? 

    —-any recommendations on an affordable handyman/ contractor ? I was quoted 12000 by a contractor nearby which is way over my budget of 3k for a bathroom

2) should I must as well convert it to a two family home? - will prop tax be significantly higher ( I already am paying 9500 per year) 

Thank you so much for your help in advance! 

Heather