Bought a house with 3 bedrooms andthere were four what do I do?

[Leland James]

Hello bigger pockets! Recently bought a property with 3 bedrooms and it has 4 bedrooms. Its on the mls etc as a 3 bedroom. Here’s the thing the “extra bedroom” is quite smaller compared to the others and doesn’t have electrical outlets on the wall. It does have a window that I assume is e-gress.

Wondering.. do I need to get any permitting or anything to add electrical to the room, flooring, closet, and make a small room? What are the requirements? Process? Hoping no permitting required.