Depending on the size of the company, it may be that the same person who makes the initial visit and estimates your project is also the person who performs the work. Alternately, there may be complete separation between salespeople, estimators, project managers, superintendents and a crew of carpenters and others who perform the actual work onsite. The danger when dealing with a variety of people is that important information can get lost or forgotten – having some clear and agreed lines of communication from the start is the best way to keep things under control (and it gives you a useful basis for comparison when choosing between potential builders).