gradbeno dovoljenje

I've actually dealt with something similar during a renovation project, so maybe my experience helps here.

Yes, you can change things mid-construction but removing plumbing isn't something you can just quietly skip. It's not like changing a paint color. When the original approved plans show a shower with all its pipes, and you decide to remove it, that's a real change to what the inspector is going to look for at the end. If the finished building doesn't match the approved drawings, you're going to have a problem at final inspection and those problems are way more stressful to fix after the fact than before.

What you should do is go to your local building office and tell them exactly what changed. I know that sounds like extra work, but honestly they're usually pretty easy to deal with when you come to them first rather than them finding out at inspection. You'll probably just need an updated drawing showing the plumbing is removed and a licensed plumber to confirm the remaining pipes are capped properly and up to code.

The part most people don't think about is insurance. If there's ever a water issue in that part of the house years down the line, insurance companies dig into the permit history. Unpermitted plumbing changes even removals can give them a reason to deny a claim. Not worth the risk.

I've seen this cause real headaches in older cities especially. Where I'm from in the US, properties with undocumented plumbing changes are a constant issue. The folks handling emergency plumbing Baltimore work run into this regularly they show up for an emergency call and find pipes that were modified years ago with no record of it anywhere, which makes diagnosing and fixing the actual problem twice as complicated.

Just get the revision documented now. It's honestly not a big deal if you do it proactively it only becomes a big deal if you don't.