>>2413264
>What are the chances I get into any trouble once I go to sell this place in a few years?
Pretty good.
If you don't disclose the lack of permits, you've opened yourself up to lawsuits, and being forced to retroactively get a permit, and pay to bring it to code. (you're further fucked if code changes by then.) You won't go to jail, but it's going to cost you WAY more than doing it now.
If you dislose it, and it's listed with "unpermitted bathroom", you just lost a huge chunk of the pool of buyers, because they won't get approval for financing, or insurance. You'll have to sell "as is" and that's poison on the housing market. You may only be able to sell it buy getting a retroactive permit or tearing down the addition.
Just get the permits. it's not that complicated.