Detroit, MI Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Standard
- Lowest floor must clear base flood level
- Applies to
- New construction & substantial improvements
- Permit
- Floodplain permit required before building permit
- Alternative
- Non-residential may floodproof instead
- Citation
- Detroit City Code § 50-14-529
Summary
Detroit requires new construction and substantial improvements in flood hazard areas to elevate the lowest floor, including the basement, to or above the base flood elevation set by FEMA.
All new construction and substantial improvements of residential structures shall have the lowest floor, including the basement, elevated to or above the base flood level. The most recent base flood elevation data that was received from the Federal Emergency Management Agency shall take precedence over data from other sources.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 4).
Full Breakdown
Detroit City Code § 50-14-529 sets the elevation standard for the city's flood hazard areas, mapped along the Rouge River floodway. New construction and substantial improvements to residential structures must have the lowest floor, including any basement, built to or above the base flood elevation, using the most current FEMA data. Non-residential structures can meet the same elevation standard or be floodproofed watertight below that level, certified by a registered engineer or architect. A floodplain development permit from the Buildings, Safety Engineering, and Environmental Department is required before any work begins, per Section 50-14-527.
Violations & Fines
Building without meeting the base flood elevation standard, or without a floodplain development permit from Environmental Affairs, blocks issuance of a building permit or certificate of occupancy.
Frequently Asked Questions
Does the basement count toward the elevation requirement?
Can a commercial building in a flood hazard area skip elevating?
Sources & Official References
Other rules in Detroit
Compare Detroit to another location·View the Michigan environmental rules overview
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Flood Elevation Requirements in Nearby Cities
How other cities in Wayne County handle flood elevation requirements.