Plumbing Under the Sink - Is That in the Scope?

It's very difficult to know what is involved in a project and what's not. If the customer has never hired any one else before, rightly, they've never paid to have their kitchenry done before so they don't really know what's involved. In their head, redoing the plumbing under the sink was involved in this price that they've agreed on,. But you, as a contractor who is doing the work and it's your business, need to know if that is included or not.