N.H. Rev. Stat. Ann. § 157-B:10

Any owner affected by a ruling of the commissioner may petition the commissioner for a review of the validity or reasonableness of the ruling. The petition for review shall be filed within 30 days after the receipt of a registered letter or after refusal of the owner to accept the registered letter containing a copy of the ruling addressed to the owner at the address given on the certificate of inspection or on any application addressed to the commissioner. Upon receipt of a petition the commissioner shall, if necessary, order a hearing. Notice of the time and place of the hearing shall be given to the petitioner and to other persons who the commissioner finds are interested in the issue raised.