Looking to Convert a Detached Garage/Backyard Storage into an ADU

[Jawei Kuo]

The property is a residential property situated on a 1 acre lot in Sacramento County, California. It includes a primary residence, as well as a detached garage/storage area in the backyard that I am looking to convert into an ADU (Accessory Dwelling Unit). The building itself contains a bathroom with fully functioning plumbing, electrical, and an HVAC system in place already. In terms of the building requirements and ordinances, the property is located in Sacramento County, in an unincorporated area of the county and to the best of my knowledge under the jurisdiction of Sacramento County. If someone could confirm this that would be greatly appreciated. I have several question regarding this situation, mainly just looking for a rough roadmap of where to proceed from here and to learn some more information to get a better understanding of the process. Any and all advice/input is welcome I'd love to hear what this community has to offer.

Questions:
1. How would I go about the process of converting this detached garage/storage area into a legal and permitted ADU?

2. As far as I'm aware, there are no permits for the initial construction of this structure, where can I look to verify this and if there are indeed none, how much of an impact would this have on converting the property into an ADU?

3. Is an address required for this ADU? The City of Sacramento requires an address for an ADU as does the surrounding cities around me, however I was unable to find information regarding Sacramento County. Who would I contact for this information?

4. To what extent will California Title 24 affect the construction/conversion of the ADU?