N.D. Cent. Code § 35-13-01
Any blacksmith, machinist, farm equipment dealer, construction equipment dealer, welder, garage keeper, mechanic, or aviation operator, having an established place of business in this state who makes, alters, or repairs any automobile, truck, engine, combine, tractor, farm equipment, construction equipment, well machine, aircraft, or watercraft at the request of the owner or legal possessor of the property has a lien on that property, and on any accessories and parts placed upon the property, for reasonable charges for work done, materials furnished, storage fees, and transportation costs, until the charges are paid. If the cost of repair would exceed six thousand dollars or thirty percent or, fifteen thousand dollars or thirty percent for property used for agricultural or construction purposes, of the value of the property, in the property's repaired condition, whichever is greater, and the repairman intends to have the entire repair bill constitute a lien with priority over any liens of record, the repairman shall give notice by registered or certified mail to the lienholders of record of the proposed repair, the estimated cost of repair, and the estimated value of the property in its repaired condition. Storage fees under this chapter may not begin to accrue until fifteen days after the owner is requested to take possession of the property.
N.D.C.C. § 35-13-01