Moving sinks = replumbing?

I'm about to start a bathroom "facelift" which means a complete retile, new vanity and vanity top. My contractor built his entire house, doing all the plumbing and electrical work. My question is this:

If the new vanity is taller and wider, then the sinks have to move 3 inches to one side and up. Does this require new plumbing, or is it a simple redirect? I'm wondering what the risks are, and whether this would be considered "replumbing" if he doesn't have insurance.

ps. I know him, so I trust him, but I'm concerned about the liability in my building. No matter how skilled, shit happens.

Often, replacing a fixture requires a permit. Depending on where you live, that may require a licensed plumber to do it. Now, does this always happen? No. The enforcement is often more strict on multiple occupant dwellings verses a single family detached home. In NY - it probably requires a permit. I don't know for sure.

kludlow said:

If the new vanity is taller and wider, then the sinks have to move 3 inches to one side and up. Does this require new plumbing, or is it a simple redirect?

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Generally it would only require some modification of your trap assembly, though with only knowing what little info you provided that is just a guess.