Turning a SFR into a duplex

[Chris John]

I was curious to know what goes into turning a SFR into a duplex in terms of zoning, etc? Can you just put up drywall and add a kitchen? Do you need to get the city involved, etc.? Does the house have to be zoned R2 already or does it even matter? I'd love to know some strategies, feedback, stories, etc. if you're willing to share them. Sorry if this is in the wrong section.

Thank you!