A friend of mine is a retired LEO.. When he was building his house, he was still on the force.. The building inspector came out to his place and gave him grief because he didn't like the way the front yard drained.. It didn't drain toward the house, of course, but the guy wanted all the drainage to run out to the ditch by the road.. Problem was, the road was uphill of the house...like, by several feet, albeit over a fairly long run. What the owner had done was put a very shallow swale in the middle of the front yard, way out from the house, that would drain heavy rain away from the house and toward a neighbor's pond. There was no problem, per se...the inspector just didn't like it. So, he insisted that the drainage needed to be changed to make it drain into the ditch by the road.
My buddy informed the guy that he couldn't make water run uphill, so the only way to get water to drain up there would be to raise the house and add several feet to the front yard...and that he *definitely was NOT* going to do that. So the guy said "Well, then you're not getting a C/O." So my buddy said "Well, then get the h*ll off my property." The inspector didn't like that and insisted that he wasn't leaving and that there was nothing my buddy could do about it.
My buddy reminded the guy that he'd been asked to leave private property and had refused, which meant he was officially trespassing, and that if he didn't leave RIGHT THEN, he'd take him for a ride downtown, book him, and let him explain himself to a judge. He told me that he pointed to his cruiser in the driveway and said "And I won't even have to call anybody!" The inspector got lippy again so my buddy started toward him with every intention of putting him in the cruiser -- and trust me when I tell you that he WOULD have done it..
The guy high-tailed it to his car and my buddy moved into his house THAT DAY -- without a C/O.
I asked if he ever got his C/O, and he said it magically appeared in the mail some weeks later, though he'd never again heard from the inspector guy.
Jes sayin'...I don't know of anybody who's ever built a place and hasn't had trouble with inspectors, codes, etc. Even if you get it right, just knowing you're going to be "inspected" and will have little recourse but to do as you're told -- regardless of what it will cost or whether you agree with it -- can be very, very stressful. When it's all over with, I'm sure that $600 overage will be small potatoes and he'll appreciate that you were just trying to keep everything on the up and up for insurance purposes, to get the C/O, etc..