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Data updated October 22, 2026

Data updated October 22, 2026

Zone AE flood zone: what it means for buyers and owners

Updated October 22, 2026

Zone AE is a Special Flood Hazard Area: land FEMA expects to flood in a 1% annual chance (100-year) flood, with a base flood elevation (BFE) shown on the map. A mortgage from a federally regulated or federally backed lender on a building in Zone AE requires flood insurance.

Zone AE marks land that FEMA’s flood study shows will be covered by the base flood, the flood with a 1% chance of being equaled or exceeded in any given year, and for which the study computed a water surface elevation. That elevation is the base flood elevation (BFE), printed on the Flood Insurance Rate Map (FIRM) in feet above a vertical datum.

What Zone AE means in FEMA’s definitions

The zone symbols are set out in 44 CFR 64.3. Zones “A1-30, AE” share one definition: “Area of special flood hazard with water surface elevations determined.” The numbered zones A1 through A30 appear on older maps; current maps use AE for the same thing.

44 CFR 59.1 defines the area of special flood hazard as land in the floodplain “subject to a 1 percent or greater chance of flooding in any given year.” That area is the Special Flood Hazard Area (SFHA). It includes Zones A, AO, AH, A1-30, AE, A99, AR, V, VE and V1-30, so Zone AE sits in the same high-risk category as Zone A and the coastal Zone VE. The difference is the data: AE has a BFE, plain A does not, and VE adds wave velocity.

A 1% annual chance is not a once-a-century event. Over 30 years, the chance of at least one flood of that size is about 26% (1 minus 0.99 to the 30th power).

Is flood insurance required in Zone AE?

Yes, when the loan is federally connected. Under 42 U.S.C. 4012a, a federally regulated lender may not make, increase, extend or renew a loan secured by a building in an SFHA, in a community where NFIP insurance is available, unless the building is insured for the term of the loan. The same rule covers loans bought by Fannie Mae and Freddie Mac and federal agency financial assistance. Coverage must be at least the lesser of the outstanding principal or the NFIP maximum for that type of building, and lenders must accept private flood policies that meet the statutory definition.

44 CFR 64.3(b) lists AE among the zones where “mandatory purchase of insurance is required.” Our guide to flood insurance requirements covers escrow, coverage amounts and exceptions.

Building rules in Zone AE

The National Flood Insurance Program sets minimum floodplain management standards that participating communities must adopt. 44 CFR 60.3 scales them by how much data FEMA has provided. Once a community has final BFEs in AE zones, paragraph (c) applies, and for new construction and substantial improvements (work costing 50% or more of the structure’s market value) it requires:

  • Residential buildings: lowest floor, including basement, elevated to or above the base flood level (60.3(c)(2)).
  • Nonresidential buildings: lowest floor elevated to or above the base flood level, or the building made watertight below it, with an engineer’s or architect’s certification (60.3(c)(3) and (c)(4)).
  • Fully enclosed areas below the lowest floor: usable only for parking, building access or storage, with flood openings that let water in and out (60.3(c)(5)).
  • Manufactured homes elevated to or above the BFE and anchored (60.3(c)(6)).
  • Until a regulatory floodway is designated, no development that raises the base flood more than one foot (60.3(c)(10)). Where a floodway is adopted, encroachments that raise flood levels are prohibited (60.3(d)(3)).

These are federal minimums (60.3 calls them “minimum standards”), so check the local floodplain ordinance and building code before buying land to build on.

What Zone AE means for insurance cost

Since Risk Rating 2.0 (new policies from October 1, 2021, all renewals from April 1, 2022), FEMA states that the NFIP’s pricing approach “does not use flood zones” to determine flood risk. Premiums reflect flood frequency, flood types, distance to water, elevation and rebuilding cost. FEMA adds that its map data still “informs floodplain management building requirements and the mandatory purchase requirement.” In Zone AE, the zone decides whether you must buy; the building’s own features decide the price. An Elevation Certificate records the lowest floor against the BFE and can be submitted for rating.

How to check whether a parcel is in Zone AE

Search the address on FEMA’s Flood Map Service Center, which holds the effective FIRM and any Letters of Map Change. Lenders use a Standard Flood Hazard Determination for the building itself. If the structure sits on natural ground above the BFE even though the map shows it in Zone AE, FEMA can remove it from the SFHA with a Letter of Map Amendment (LOMA), after which the federal purchase requirement no longer applies to that structure.

Zone AE in Miami-Dade County

Of the about 551,600 buildings we count across Miami-Dade’s 80 ZIP code areas (78 with reports), 99,269 (18%) sit in Zone AE, which makes it the second most common SFHA zone in the county after Zone AH. The counts place each building’s centroid in FEMA/ORNL’s USA Structures inventory on the effective FIRM, from a July 2026 snapshot of FEMA’s National Flood Hazard Layer; a building’s official determination can differ.

Zone AE covers 96% or more of the buildings in the Miami Beach, Surfside and Key Biscayne ZIPs, and large inland areas in the north of the county:

  • ZIP 33015 in Hialeah: 9,040 buildings, 99.7% of the ZIP’s total, with base flood elevations of 6 to 7 feet on the map.
  • ZIP 33055 in Opa-locka and Miami Gardens: 8,422 buildings, 77%.
  • ZIP 33139 in Miami Beach: 3,446 buildings, 99.8%.

New FIRMs for Miami-Dade take effect on February 19, 2027 (91 FR 65238, published October 14, 2026). A parcel’s zone and BFE can change on that date; see our summary of the 2027 Miami-Dade flood maps.

Questions

Is flood insurance required in Zone AE?

Yes, for a building secured by a loan from a federally regulated or insured lender, a loan bought by Fannie Mae or Freddie Mac, or other federal financial assistance, in a community that participates in the NFIP. Coverage must be at least the lesser of the outstanding principal or the NFIP maximum for that building type.

What is the difference between Zone AE and Zones A1-A30?

None in meaning. 44 CFR 64.3 gives the same definition to both: an area of special flood hazard with water surface elevations determined. A1-A30 are numbered zones used on older maps; newer maps use AE.

Does Zone AE set my flood insurance premium?

Not directly. FEMA's current NFIP pricing does not use flood zones to calculate premiums. The zone still decides whether federal law requires a lender to make you carry flood insurance.

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