I. In municipalities which have established one or more historic districts pursuant to N.H. Rev. Stat. § 674:46, but which have no local zoning ordinances, the historic district commission shall have within the bounds of the historic district all the authority, powers and duties prescribed in this chapter for planning boards insofar as such authority, powers and duties are within the intent of the historic district commission’s grant of power. In such municipalities, the requirement of conformity with the local zoning ordinance, as provided in N.H. Rev. Stat. § 674:46, shall not apply.
II. In municipalities which do not have a planning board, the requirements of N.H. Rev. Stat. § 674:46 and 676:6 relating to conformity with the master plan and the requirement of N.H. Rev. Stat. § 673:4 that one member of the commission may be a planning board member shall not apply.
III. In municipalities which do not have a building inspector, the certificate of approval of the commission, as provided in N.H. Rev. Stat. § 676:8, III, shall be the equivalent of a building permit. In municipalities which do not have a zoning board of adjustment, motions for rehearing and appeals from decisions of the historic district commission shall be governed by the provisions of RSA 677, insofar as applicable.