As they told me in Paramedic class:
Document, document, document.
If it wasn't written down, you didn't do it.
I document every action on a job site, and show it on the final invoice, regardless of having a physical contract or not.
(OK, maybe not the "good samaritan" placing of a KO plug or replacing a missing plate screw, but any action that would require a "competent and trained person" per the Code)
I also will issue "written advisories" as part of the final invoice concerning pre-existing conditions that I perceive to be unsafe or outside of the local and national Codes within the structure or on the property - Al branch wiring, unsecured conduits, NM (we're in a no NM area), lack of GFCI's, and whether or not I worked on any of it. I also document whether the HO wanted it repaired or left in place.
