They ended up billing me $200 a month for several months before I realized what they had done.My wife's a Realtor and we flipped a couple houses that she found for us.

I have a couple of people that this has happened to, and you need to have it in writing and tied to the property to make it work. 

I find this option best if you are on a tight time frame and need to save a couple of weeks.  

This is something that I have really come to realize over the last couple of months as I've been learning.I came into this expecting it to be complicated, and I am not disappointed!

Can you send me a couple addresses of projects that someone completed that fit your model?

Hey, Jaycee, I've only been running it for a couple of months now since I closed but it's been doing about $6000/month in gross rents so far, this month will very likely be closer to $4500-ish since it's by far the worst month of the year for rentals in that area. 

and even if you aren't going to do an inspection, can you walk it with a couple contractors?

I've had a couple OOS investors ask about ADU potential in our market... not sure what hurdles there might be with the city (permitting, zoning, or otherwise).

Married Adults + 2 kidsWhat if there is 1 samll dog/cat added to each of the scanarios above?

The GC is likely at least a couple of more thousand dollars.