Several years ago, the GC who built my home was doing another custom. He called me and said he had a problem with his EC. No drywall yet an asked if I would look at the system for him. It was a disaster. Kitchen outlets wired to LR outlets, nearly all of 2nd floor on one circuit, etc. You get the picture. As he knew I wired my home, he asked me to do him a favor and correct the problems. I did, took about a week. Later, he called me and wanted to know how much he owed me. I told him that he asked for a favor and I don’t charge for favors. We have been close friends now for 14 years.