You're doing flat-rate, aren't you? If so, why not stick with what you know? Start with a healthy testing fee to test that the existing wiring is OK, then proceed with normal trim rates from your book.
The only thing I'd adjust is a pay-as-you-go schedule with deposits or advances, and a well written limit of liability. You don't want to be held responsible for the work of the previous EC. If he's looking for you to take on full responsibility, make it a total rewire.
Dave
[This message has been edited by Tiger (edited 09-10-2006).]
