Hello and welcome to Just Answer. My name is ***** ***** I will be happy to assist you with your electrical question.
1) The home inspector is referencing a double tap onto one circuit breaker. It is a code violation of the National Electrical Code to have double taps on a circuit breaker. Each circuit needs to reside on their own separate breaker. A double tap can easily overload a breaker and trip it. And yes, a double tap on a breaker can present a potential safety issue.
2) If the panel has some spare breaker slots, all that needs to be done is to remove one of the double tap conductors from the existing breaker and swing it over to a new breaker. If the conductor size is 14 AWG copper, then you need a 15 amp breaker. If conductor size is 12 AWG copper, then you need a 20 amp breaker.
3) Depending upon your location in the United States, hourly electrician labor rates can vary from $65 ot $125 per hour. An average hourly rate is around $85 per hour plus materials. Most electricians will charge you for a 1 hour service travel call plus another 1 hour to complete the work. Breakers are cheap... approximately $5 or $6 for a single pole. So a ballpark figure, you're looking at approximately.........$170 in labor plus the breaker cost of around $5 or $6 each breaker to correct the problem.
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