ADU construction help

[Jerry Akop]

I have the opportunity to build am Adu in sun valley, ca on my 4 unit property. I have a 4 car garage in the back with alley access. Plans to do do a 2 story above garage 1080sqf 3 bedroom 2 bath unit.

Projected rent Aprox 3500-3800 a month

1. Is it worth it? Aprox cost around 300k ish

2. I dont want to hire a contractor. I have all the contacts. Can i get my own insurence to cover me during construction. Workers comp and all other aspects.