N.J. Stat. § 45:8-37
License certificates shall expire on the thirtieth day of April following issuance, renewal or reinstatement and shall become invalid on that day unless renewed. Licensees shall apply for renewal on or before the thirtieth day of April of each year. It shall be the duty of the secretary of the board to notify all persons licensed under this chapter of the date of the expiration of their certificates and the amount of the fee that shall be required for their renewal for one year; such notice shall be mailed to each licensee at his post-office address known to the board at least one month in advance of the date of expiration of said certificate. Renewal of any certificate issued under this chapter may be effected at any time during the month of April by the payment of the fee of five dollars ($5.00).
The failure on the part of the licensee to renew his certificate annually in the month of April as required shall not deprive such person of the right of renewal during the ensuing year but the fee to be paid if the license be renewed in any month during the current year subsequent to April shall be seven dollars ($7.00) instead of five dollars ($5.00); and, if the license certificate be not renewed in the current year, the licensee shall pay a reinstatement fee of ten dollars ($10.00) plus five dollars ($5.00) for each year in which the licensee is in arrears. One notice to the licensee, by mail, on or before April fifteenth, addressed to his last post-office address known to the board, informing him of his failure to have applied for a renewal of his license certificate, shall constitute legal notification of such delinquency by the board.
The failure on the part of the licensee to renew his certificate within one year from the date of the expiration of said license certificate will automatically revoke such license certificate and the right of the person to practice thereafter shall be restored only upon the payment of the ten dollar ($10.00) reinstatement fee plus all arrearages. Continuing to practice as a "professional engineer" or as a "land surveyor" after the expiration of his license shall render the person so doing liable to all the penalties prescribed for practicing without a license certificate.
N.J.S. § 45:8-37