I don’t need a permit for my Ag building, right?
While owners are not required to obtain a building permit for an Agricultural Building on lands designated as State Land Use Agricultural (may be different than County Agricultural) there is still a process an owner needs to go thru with the County Building department. The law that governs this can be found in Hawaii Revised Statute (HRS) 46-88. Key points are shown below from subsection c:
(5) An owner or occupier that intends to utilize the exemptions under this section shall provide written notice to the appropriate county agency of the size, type, and location of the proposed building, structure, related appurtenances, or development. No work shall commence until the county agency has determined that a building permit for the proposed building, structure, related appurtenances, or development is not required for compliance with county, state, or federal floodplain management development standards, ordinances, codes, statutes, rules, or regulations pursuant to the National Flood Insurance Program requirements;
(6) The appropriate county agency shall certify the building, structure, related appurtenances, or development within thirty calendar days upon the receipt of the written notice from the owner or occupier, pursuant to paragraph (5);
(7) The owner or occupier shall provide a final as-built written notice to the appropriate county building permitting agency of the final as-built size, type, and location of the building, structure, related appurtenances, or development. Such final as-built written notification shall be provided to the county agency within thirty calendar days of the completion, occupancy, or use of the building, structure, related appurtenances, or development. Failure to provide such written notice may void the building permit or building code exemption, or both, which voidance for such failure is subject to the sole discretion of the appropriate county building permitting agency;
So, while no permit is required, an owner DOES need to interact with the County Building Department to provide notice of the Ag Building. Note that any such buildings may not include plumbing or electrical work that would require a permit.