If you have a good customer, one that give you repeat business, you could do the samll extras for free if you want and then send the customer a no cost change order for the work showing the cost then a credit.

This way they now know what was done and how much it would have cost if you charged them. This works when you know there will be a larger change later. They don't nickel and dime you as much.

One time customers should pay for everything. No freebies. [Linked Image]