ADU San Francisco Bay Area (San Jose)

[Sayantan Satpati]

Hi,

I wan't to build a detached ADU in our backyard. This would be my first home building/addition project. I was looking for suggestions on:

1. Total Cost & Cost per sq / ft 
2. Project timeline
3. Suggestions on contractors
4. Can I have tenants in the house when we build the ADU?
5. Can I additionally convert my garage in to junior ADU?
6. Can I expect comparable rent from ADU (per sqft) as from the main home?
7. Any other tips/suggestions? 

My objective is to rent out the home and ADU separately