Attached Jr ADU Appraisal Question

[Steve V.]

Not sure if this is the correct category. 

I plan to build out an attached Jr ADU from garage in SoCal and I was wondering how does the appraisal work for something that is attached? I have seen people post about not getting the right appraisal because the appraiser didn't know how to appraised a detached ADU that is not part of the house. Has anyone ran into any issue with getting the house appraised with the attached jr ADU? Thanks