Rezoning from a single to multifamily

[Bryan Cress]

I have two deals in my market that are zoned as single family homes. One has an ADU that the listing specifically states it will have to be rezoned. The other is a upper economy unit that is pictured, but not mentioned in the listing.

Is it likely that these additions are not permitted? Do I have to rezone the duplex? What is a typical cost to rezone, or is it highly local?

Note: small communities/rural communities