Do I need permits to convert a single unit to duplex?

[Jake Miller]

I have a 4 unit property that is separated into three buildings. One of the buildings is a three bed two bath that was converted from two 1 bed/1 bath units. I was considering turning it back into two units as that would generate more income than I would be able to get from the one unit.

I was curious if I need any kind of permits to change the construction of my property?

Also, I know it may depends on what my plan is (hold vs sell) but also possible advantages and disadvantages of converting it from a 4 to 5 unit. Obviously, I would be able to generate more income but it may also be more challenging to sell a 5 units as I'm reducing my potential buyers.

Thanks!