Nassau County, FL Environmental Rules: Flood Zones (2026)

" No permit issues until the chapter and all other applicable codes are satisfied. 50, temporary construction offices, certain utility facilities, tribal chickees, small family mausoleums and correctional temporary housing. Section 10½-58 requires a written application describing the development, the land by legal description or address, the intended use, a site plan or construction documents, the work's valuation, and the applicant's signature. Section 10½-60 voids a permit if work does not commence within 180 days of issuance, or is suspended or abandoned for 180 days after starting, with extensions of up to 180 days available on written request for justifiable cause.

Section 10½-61 lets the floodplain administrator suspend or revoke a permit issued in error or based on incorrect or incomplete information. Section 10½-62 conditions permits on obtaining other required state and federal approvals, including St. Johns River Water Management District permits and, where applicable, state department of environmental protection and Army Corps of Engineers permits. For manufactured homes, section 10½-164 requires elevation of the bottom of the floor framing at or above the base flood elevation plus one foot outside coastal high hazard areas, or the bottom of the lowest horizontal structural member at or above base flood elevation plus one foot within coastal high hazard (zone V) areas.