I've hired an electrician to replace a sub-panel in my attached garage. The sub-panel will be bonded via EMT to the service entrance, which is on the outside of the garage -- definitely the same structure. He claims I also have to drive a grounding rod for the sub-panel, and add a GEC from the sub-panel to a nearby water pipe. I don't want to because it costs more, looks ugly, and is likely to confuse future buyers. I can't see any reason for me to do this. Is this a new requirement in the most recent NEC? (I live in Los Angeles)