I've only been in biz for myself for a short time now. Just curious how you guys handle this scenario. Customer buys new house and has a laundry list of electrical work that needs to be done. We agree on a price and I list everything in detail in my proposal. I'm there for roughly 6 full days. Along the way he continues to add things. Nothing huge but ceiling fan here , outside gfi there, etc. then he balks at my invoice when it's $650 higher then the proposal. I explained exactly why and he paid me but he seemed a little surprised that I was charging him extra. My fault for not discussing cost when he originally asked but I would think its assumed, more work=more money.