A contractor must have a license in North Dakota to work on any job costing $2,000 or more.
To do electrical work in North Dakota, you need to be licensed as a master, journeyman, or class B electrician.
All the wiring must be performed by a licensed electrician. For other tasks such as roof mounting you do not need to be an electrician, but must pull a building permit. A wiring certificate must be filed with the North Dakota State Electrical Board before electrical work is performed if it exceeds $300.00.
Licensing (Solar thermal)
To do plumbing work in North Dakota, you need to be licensed as a journeyman or master plumber.
Resources: Secretary of State, State of North Dakota