Electrical Panel Upgrade: frequently asked questions
These answers are general. For your situation, check the official sources listed below or ask a professional.
Do I need 200 amps?
It depends on your current and planned loads; an electrician performs a load calculation.
Do I need a permit?
Yes, and the utility usually needs to disconnect and reconnect the service.
Will I be without power?
Usually for several hours on the day of the swap.