N.D. Cent. Code § 43-18-03
Each appointed member of the board shall qualify by taking the oath of office required of civil officers and shall hold office for a term of four years and until a successor is appointed and qualified. The terms of office of the appointed members must be so arranged that one term only expires on the thirtieth day of June of each year. The four members appointed by the governor to the first board must be appointed within thirty days after July 1, 1975, to serve for the following terms: one master plumber for one year, one journeyman plumber for two years, one mechanical engineer for three years, and a representative of the consuming public for four years. A vacancy on the board caused by the death, resignation, or expiration of the term of any appointed member must be filled for the unexpired term by appointment by the governor from the class of members to which the deceased or retiring member belonged.
N.D.C.C. § 43-18-03