How do you deal with a customer who thinks they can save money by doing some of the work themselves? Long story short, I'm working for a GC on a 2 story addition. Kitchen expansion and master bdrm/bath. Got to the job yesterday and noticed 4 extra hi hats in the kitchen that I didn't install. He jumped off one of my existing lights. He used a different brand can that my trims wont fit either. We found out the homeowner did this at night so I removed them and explained why. Insurance reasons, different style trim, etc. then I started looking around and noticed additional wires and outlet boxes. I called him back and explained it again. This time he got a little angry. I removed everything he did. He's a close friend of the GC so I'm trying to be civil here. GC says he agrees with me that this guy can't do this. Should have an interesting conversation this morning.