Both of the houses that I have purchased have required upgrades from 60A to 200A. In both cases it cost around $1800. I'm in Memphis, TN ... a medium sized city. The houses are 80 years old so the circuit design is pretty bad. Although the wiring itself is usually in pretty good shape over all (yay for knob and tube).
Make sure your electrician gets the largest panel available. After installing central air and adding/redesigning circuits I have already filled up the new panel. It's not a luxury to have the refrigerator, microwave and other appliances on a dedicated circuit (some codes probably require it). I even have my main computer on a dedicated circuit with a dedicated ground. I'm weird that way.
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