No and yes! No, they do not require a building permit, but do require a setback permit obtained through the building department if the agricultural building is located in an agricultural zoning district (A-20, A-40, R-10, and RR-40 in Blaine County) and they meet the definition contained in the Blaine County Building Code: "Agricultural Building": A structure designed and constructed to house farm implements, hay, grain, poultry, livestock or other horticultural products.
This structure shall not be a place of human habitation or a place of employment where agricultural products are processed, treated or packaged, nor shall it be a place used by the public." Yes, agricultural buildings do require building permits when not located in the zoning districts listed.