You don’t know what you don’t know. Unless the homeowner is a professional residential contractor renovating their own home, they cannot possibly do enough research to manage their own renovation project efficiently. They simply do not have the experience to know where the traps are.
Hiring an integrated design and construction team with experience is guaranteed to save time and money. The choice of materials, scheduling and time to completion are all managed by the integrated team. The investment in doing so is more than justified by the savings in the home renovation project.