My Father in Law is having a bathroom re tiled, new vanity etc. So far nothing planned will trigger a permit here, no plumbing in the wall past the stops. I looked over the electric and the light and fan are on a general lighting circuit, the receptacle serving the counter top is on a dedicated 15a circuit. (just that receptacle on a 15a GFCI breaker) The 1440w wall heater is on a dedicated 15.
He really did not plan on any electric work. Is this important enough to insist that he remove and abandon the 15a circuit and replace it with a 20? It won't be easy.