Permit scenario in San Diego

[Phil Reason]

Hey my friends, looking for your thoughts on this scenario

I just purchased a property here in SD with an addition on it. No permits but it’s been there for about 20yrs. 

Sdge is doing a utility project in the area, and is requiring me to make a change to my electrical panel. A city inspector is going to have to come out and look at the electrical work when it’s done. 

Nervous about having an inspector here, since I know there’s an unpermitted addition on the property. You guys think it’s likely this will turn into a massive headache? Anything I should think about ahead of time? 

Thanks!