Cedar Rapids, IA Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Freeboard, AE zones
- 2 feet above BFE
- Floodway add-on
- Extra 1 foot required
- Fill elevation
- 1.5 ft above BFE, 5-ft apron
- Non-residential option
- Dry floodproof to 2 ft
Summary
New and substantially improved homes in Cedar Rapids' AE flood zones must have their lowest floor at least two feet above the Base Flood Elevation, with an extra foot required inside the mapped floodway.
All new or substantially improved residential structures shall have the lowest floor, including basement, elevated a minimum of two (2) feet above the Base Flood Elevation. Construction shall be upon compacted fill which shall, at all points, be no lower than 1.5 ft. above the base flood elevation and extend at such elevation at least 5 feet beyond the limits of any structure erected thereon.
The Administrator may allow alternate methods of elevating (such as piers or extended foundations) where existing topography, street grades, or other factors preclude elevating by fill. In such cases, the methods used must be adequate to support the structure as well as withstand the various forces and hazards associated with flooding.
All new residential structures located in areas that would become isolated due to flooding of surrounding ground shall be provided with a means of access that will be passable by wheeled vehicles during the base flood.
D.Non-residential structures. All new or substantially improved non- residential structures shall have the lowest floor (including basement) elevated a minimum of two (2) feet above the Base Flood Elevation, or together with attendant utility and sanitary systems, be dry floodproofed to such a level.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 24).
Full Breakdown
Section 32B.08 sets the city's freeboard standard: new or substantially improved residential structures in a mapped AE Flood Zone must elevate the lowest floor, including any basement, at least two feet above the Base Flood Elevation, built on compacted fill at least 1.5 feet above BFE and extending five feet beyond the structure. Non-residential buildings can instead be dry-floodproofed to the same two-foot level. Inside the regulatory Floodway, Section 32B.06 adds a further foot of protection on top of whatever the surrounding flood zone already requires.
Violations & Fines
Building below the required elevation without an approved variance violates Chapter 32B and is a misdemeanor and municipal infraction, and it can also raise flood-insurance premiums.
Frequently Asked Questions
How high above base flood elevation must a Cedar Rapids house be built?
Is the freeboard higher in the floodway?
Sources & Official References
Other rules in Cedar Rapids
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