You have to be able to fit a standard P trap under the sink. With a shallow sink, you perhaps could raise the drain and still get a P there. But, maybe not. You need to do all the math.

My question is why do you have a spigot under a bathroom sink?

To clarify, the issue is that given where the rough plumbing was placed it won't work with the floating vanity we purchased. In order to fit a standard P trap under the sink the contractor would need to cut a whole out of the bottom of the floating vanity. If the rough plumbing was raised by about 4-5 inches, problem solved. My contractor's plumber claims this is against code. But I've been told by a different plumber that he does not think this is correct. So I was wondering if folks here now of any reason why raising the rough plumbing wouldn't be allowed. Not sure why they put a spigot there, but that's obviosuly temporary. I just want to figure out if there is a rule that says the drain pipe can't be more than 19 inches off the ground. Any insight on that would be greatly appreciated. Thanks!

We had a similar issue. I learned that (at least where I live) 18" is common but not code. Unfortunately our vanity has a drawer that is supposed to be below the p-trap so if they had put it higher up the wall as the vanity installation instructions specified, it would have been fine. It was frustrating given that the GC had the vanity in hand before any of the plumbing work was done, but it was minor in the grand scheme of issues we had in the end so we just let it go. They ended up cutting out the back of the drawer to clear the p-trap, which was a workable if not ideal solution. It's obviously much trickier with a floating vanity, but you might check the specs to see if there's guidance on installations in bathrooms with existing drains at that height. The only code element, if I remember, had to do with the height of the sink top from the floor, but that was unaffected by the height of the rough plumbing.

There is no code dictating where the rough in comes out of the wall.