/diy/ - Do It Yourself

I'm adding a completely new bathroom to the addition on the back of my house. I gather I should have probably pulled a permit as I'm moving/adding a bunch of plumbing, gas and electrical. I'm also adding a couple interior walls in addition to drilling through exterior walls to add ventilation.

What are the chances I get into any trouble once I go to sell this place in a few years? I live in a major city so it's not like a house going up for sale with one more bathroom than it had the last time it was listed is going to catch anyone's attention. Does anyone actually pay attention to things like that?