I. In cities or in towns operating under the town council form of government, and in counties in which there are located unincorporated towns or unorganized places, the local legislative body shall determine the manner in which a zoning ordinance, historic district ordinance, or a building code is established and amended; provided, however, that any question concerning the establishment and amendment of a zoning ordinance, historic district ordinance, or a building code may be placed on a ballot separate from the ballot used to elect city or town officers. The planning board shall forward to the town clerk all proposed amendments to a zoning ordinance, historic district ordinance, or building code not later than the fifth Tuesday prior to the date for electing city or town officers.
II. No zoning ordinance, historic district ordinance, or building code shall be established or amended until after a public hearing is held in accordance with the procedures required under N.H. Rev. Stat. § 675:7 on the proposed zoning ordinance, historic district ordinance, building code or amendment.