It is recommended that when building a house you use a licensed builder. By using a licensed builder you are offered certain protections.
You should check that your builder has insurance, the types of insurance they will likely hold include public liability insurance. Each state will have different requirements for what insurance it requires a builder to hold.
Some builder may utilise sub contractors when building a house. To ensure that the job is done to the right quality you need to make sure that the builder who you are dealing with will be on the ground making sure the building is built correctly.
Ask your builder for some examples of houses that have been constructed by them. Go have a look at these constructions and if the owners are about, have a chat about the house and how they found the building process.