Yep Roger is spot on. When We added the addition, we had to put a way bigger main box in and we ran a sub panel to the rebuilt chicken shed/aka garage. At the time I wanted 220v out there, but it would of meant another larger upgrade and P G and E coming out to disconnect and reconnect, so I settled for 110, and a smaller amount of juice in the garage. Everything was done in stages, and our initial electrician, had moved out of town, so the new guy didn't know I wanted 220 until, after the new box was put in(we connected the garage a year after the addition, even though we built it a year before! By then Gary had moved back to town, and the interim electrician, had quit the trade to go into the hearing aid buisness. But the point here is you may need a bigger service panel and connection to the main pole.