George is right, you could just run one new 20a circuit and pick up other loads in the bathroom. I was just thinking about the fastest way to get legal. Usually in a "happy days" era house the bathroom will be on a circuit with whatever was close and not anticipating much load. There might only be a 1-15 in the light over the mirror. That was usually going to be an electric razor, maybe a toothbrush charger but that was an afterthought.
Then they invented the hair dryer
