I would just do it,they tend to be pretty full of themselves but the reality is that private property is still private,don’t let them bully you.It’s when you go to sell that they get their digs in,forcing you to remove un-permitted items before allowing title transfer.
I'll provide a slightly different context.
We bought a house five years ago. While the house is 25 years old, the PO finished the basement and did some other work, apparently without pulling any permits.
Shortly after we moved in, I discovered that the PO had replaced the original NG water heater with a larger one. In doing so, he screwed up the draft (as in, we weren't getting any) and the heater was dumping CO and combustion byproducts into the basement.
I went to the town hall and requested all of the house records. What I got was a folder with the original building plan and that was it. I wonder if my wood stove permit made it into the jacket.
No permit was pulled on the hot water heater replacement. If there had been, I might have been able to get the PO or the installer to fix the problem at their cost. Instead, I had to cover the cost of fixing the problem...and opted to go for an indirect unit at a higher expense.
The upside was that I learned, via the original building plan, is that our lot line is 41' from the house foundation rather than the 14' shown on the mortgage paperwork. That was a win.