Work is work. You need to get paid for work. Whether it was part of the initial proposal or added on afterwards, you need to bill for it. This also keeps the client in line. If they are being billed for every change, they start to prioritize their changes.

When you set up your initial agreement with the client, definitely account for a period of revisions. Perhaps you may say "estimate includes 10 hours of revisions". 

You then need to stick with that and if it goes beyond 10 hours, bill accordingly. This is typically handled with a clause ala "revisions beyond the 10 hour allotment will be billed at the standard hourly rate of $xxx".

Post-launch, changes typically have to be documented a bit more formally and you want to use something called a change request. A change request is essentially a mini-project with it's own analysis phase and estimate that the client agrees to before work commences.

How do you deal with amends from a client?
This might be subjective, I don't know. However, it's a serious problem for me. My electrical bill is outrageous. It's three times as large as my next-door neighbor, and four or five times the size of my neighbor's across the street. It's worse in the summer (I live in central TX), but I've had the air conditioner inspected, and while the house is right at the maximum capacity for our unit, the unit should still be able to take care of the load. That also doesn't explain why our winter bills are larger than the comparables.

What I would like to do is check the amount of current drawn by each running appliance and calculate where all my money is going. I just don't know how to go about doing this.
