If you build a house, you definitely need a certified professional who submits the plans to the authorities on your behalf. This is often the architect. General contractors (GUs) also usually work with architects who create the plans. So, to put it briefly, you have to pay this person anyway. However, in my experience, the work ethic is not always what it should be. If you present a sketch, the planner does not think independently but merely copies it. Therefore, it is best not to bring anything except the list. This way, he has to think for himself, and after all, he studied for that. Be careful when commissioning the architect. Oral orders are also considered given! Look at what he has planned so far, website, references, possibly also the companies he works with. It also has to fit on a personal level. If you are not 100% convinced, keep looking.