N.C. Gen. Stat. § 87-22
All persons, firms, or corporations engaged in the business of either plumbing or heating contracting, or both, shall pay an annual license fee not to exceed one hundred fifty dollars ($150.00). The annual fee for a piping or restricted classification license shall not exceed that for a plumbing or heating license. All persons, firms, or corporations engaged in the business of fire sprinkler contracting shall pay an initial application fee not to exceed seventy-five dollars ($75.00) and an annual license fee not to exceed three hundred dollars ($300.00). In the event the Board refuses to license an applicant, the license fee deposited shall be returned by the Board to the applicant. All licenses shall expire on the last day of December in each year following their issuance or renewal. Persons who obtain a license by passing an examination on or after October 1 of any year may receive a license for the remainder of the year by paying one-half of the usual license fee for that classification of license. It shall be the duty of the secretary and treasurer to send by United States mail or e-mail to every licensee registered with the Board, notice to the licensee's last known address reflected on the records of the Board of the amount of fee required for renewal of license, the notice to be mailed at least one month in advance of the expiration of the license. The Board may require payment of all unpaid annual fees before reissuing a license. In the event of failure on the part of any person, firm or corporation to renew the license certificate annually and pay the required fee during the month of January in each year, the Board shall increase the license fee by twenty-five dollars ($25.00) to cover any additional expense associated with late renewal. The Board shall require reexamination upon failure of a licensee to renew license within three years after expiration. The Board may adopt regulations requiring attendance at programs of continuing education as a condition of license renewal. A licensee employed full time as a local government plumbing, heating, or mechanical inspector and holding qualifications from the Code Officials Qualifications Board may renew the license at a fee not to exceed twenty-five dollars ($25.00).
N.C. Gen. Stat. § 87-22