Cost to replace wiring in a house can vary from state to state and from electrician to electrician. But expect to pay around $100.00 per hour plus service call for the electrician to do the work.
If the house is being completely rewired the electrician may or may not bring an extra employee or 2 and then the cost could add up to more money.
Rewiring a house though can cost from $8,000.00 to $20,000.00 depending on how much wiring needs done and how easy it is to get the wiring replaced.
Upgrading to a 200 AMP service could cost you at least $2,000.00 since they have to replace the service entrance wire, and meter box to your home.
Check and be sure if you can get 200 AMP service to your home from your electric company because some won't run the new size needed wire for 200 AMP service.