A word to the wise about adjusting your fees after your quote

This post is part of our Weekly-ish Tips series.

My spouse and I were recently on the hunt for a favorite electrician for house stuff—one that would finally be our “go to” to call on, after having tried several. This one came so close. And then they made a trust-related mistake that had nothing to do with the quality of their work. I recognize the mistake as one that a lot of sellers make, especially in professional services. Do you?