Agreed, if a skip is required, not always though, I list it as part of the costs in a quote. I always state particularly for small jobs i.e. floor tile removal, that I will bag up in rubble sacks so the customer can take them to the local tip fort he cost of fuel only. If they want me to remove and dispose, then the customer pays me to do it. You shouldn't withhold payment because of this. Your analogy about the tree is a good one though. I've got a guy to come and remove AND dispose of 2 conifers in my garden including removal and disposal of stump and roots. Got a price for it and I know exactly what will get done in that price.