Check with the state/local AHJ in your area. You will have a number of thing to do to be a legimate business. Business regristration, tax numbers, permit requirements, labor law compliance, etc are very important. If any thing goes wrong and you do not have these legal issues covered, you can be in for severe financial loss and possibly some jail time.
If you want to do the work do it right and CYA.
Most of the EC's in my area carry $1,000,000 with a $2,000,000 umbrella for the business insurance. Permit bonds as required by the permitting authority add to the bill.
Good Luck
