@Brandon Brown if you are serious about the ADU, then you will want to talk to an architect before embarking on this journey.

I currently have a site plan, rough drawings & have architects, contractors & planners working through this process. 

I definitely recommend doing your own research but our architect helped us through the regulation and permitting process. 

any info on the architect or design of the building too? 

Call one of your architects to do the research for you, noone in BP will have all your answers, they are too specific, your architect and the building department will know the answer to those questions. your firm should be able to get quotes from builders mentioned on your profile.

Hello @Jorge LeeAs an Architect and Developer for my clients, I will answer the questions I am most familiar with. 1.)

The costs involved are about $100.000 all in (permits, engineering, architects labor , materials ) - I’m thinking that would be a better long term Investment than another SFH . 

This is an engineer/architect/ building dept questionOnce the rehab is complete would you be able to refi the debt all in one loan?

Aaron Vanderpool - Architect/Investor

I got local expeditors, who are also architects do a walkthrough for $150 some years ago to discuss all the issues.