General contractors do not need a license in Maine, but you are advised to check local jurisdictions. You will need to be licensed to do electrical contracting and to fish and hunt which on some days seems more preferable than shaking out steel. Change that to most days.
To find out if an electrical contractor is licensed, click on Electrical Licenses.
Out-of-state contractors working in Maine must be licensed by the Bureau of Corporations. For information click here .