The cost of a house plan in the United States can vary greatly, depending on the complexity of the design, the size of the home, and the materials used. On average, a basic house plan can cost anywhere from $400 to $2,000; a more complex plan can cost anywhere from $2,000 to $10,000 or more.
Whether you prefer buying a design online or not depends on your personal preference. Some people may prefer to purchase a plan online as it can be more cost-effective and the designs may be more customizable, while others may prefer the more hands-on approach of meeting with an architect or designer to develop a plan.