I can PM you my contact down at the housing department who will tell you everything you need to know from advertising your unit to completing the rent assistance inspection.   

Actually, if you are starting out and on a tight budget, it would not be unusual for you to handle the construction administration and project management during the construction phase and employ architect for plans, building department filings and design only.  

I'm currently looking at a property that would work if it had 2 units, and found this on the California Department of Housing's website "ADUs within existing structures must be allowed in all single family residential zones" This has really peaked my interest and I would love to hear what others might know.Thanks!

I deal with the Phoenix building department quite often, so feel free to PM me with any specifics.

Is it the township, and if so, which department usually can help with that? 

The Sonoma and Napa building departments will be overwhelmed with applications and good luck finding a contractor in the next 3 years.So if you're thinking about buying some of these burned out lots - as I am - you need to have substantial capital and be willing to wait possibly 5+ years before you'll have something to sell.Interested to hear other people's takes on the situation.

I am going to be apply to join a couple of different police departments soon.

I have my business license with the city of Aurora codes and zoning department. 

They won't do new construction but would love repairs you are seeking.I found one person by asking the plumbing department guy at Home Depot.

Here's what the US Department of Justice has to say:18.