Our builder has suppliers with whom he works to provide flooring, plumbing fixtures, drawer and cupboard pulls, etc., etc. These suppliers also provide logistic support in case a kit has a missing or damaged part, to assure parts arrive on the contractor’s schedule and to deal with whatever issue comes up. That has value and is worth some extra cost. That being said, when we met with the plumbing fixture supplier, the design choices he gave us were no where close to what we really wanted. When Lorena and I got home after the meeting, I looked up what we had purchased for our house in Centralia, Washington that we really loved, we found that a package would replaced most or all of what the supplier recommended cost over $3000 less. For that amount of money, we can certainly handle some of the logistics.