How to do a 2nd Story addition

[Dan Perez]

Hello Investors!

I am an aspiring RE investor from the Orange County, CA area.

Hoping to get some insight on the procedures I should follow in order to get permission to build a 2nd story addition.

I've been debating whether to build up or build out for an ADU that is on my lot. The unit is rather small roughly 400sqft so I would like to expand the space. The unit is actually under the same rough as my house if that makes a difference. Would the 2nd story be drastically more expensive? The unit has plumbing, electricity, etc, I would just like to add more living space.

Any feedback is helpful, Thanks!