Des Moines Floodplain Permits & Mitigation Rules

Land Use and Zoning Iowa 4 Minutes Read ยท published February 10, 2026 Flag of Iowa

Des Moines, Iowa property owners must follow local floodplain and stormwater rules when developing or altering land in mapped flood zones. This guide summarizes permitting triggers, minimum construction and elevation standards, inspection and compliance paths, and how enforcement and appeals work for projects inside regulated floodplain areas. It synthesizes official Des Moines municipal sources and federal guidance current as of February 2026 and points to the primary code, permit pages, and FEMA forms you will need to start an application and remain compliant.

Overview of Flood Mitigation Requirements

The City of Des Moines regulates development in the floodplain to reduce risk to life and public infrastructure. Typical requirements address limiting fill, elevating structures, floodproofing non-residential buildings, and preserving flood conveyance. Local regulations implement minimum standards consistent with the National Flood Insurance Program and the City code. For the controlling ordinance and definitions, see the Des Moines Code of Ordinances.Des Moines Code of Ordinances[1]

Common Permit Triggers

  • New construction or substantial improvement of a structure in a mapped flood zone.
  • Placement of fill or change to ground contours within the floodplain.
  • Non-residential floodproofing and repairs requiring a building permit.
  • Elevation certificates or floodplain development permits for projects showing adherence to base flood elevation standards.
Always check flood maps and base flood elevations before planning work on a property.

Permitting Process and Timelines

Apply for required permits through the City Building/Permit office. Applications typically require a site plan showing existing and proposed grades, the base flood elevation (BFE), method of compliance (elevation or floodproofing), and supporting documentation such as elevation certificates. The City reviews plans for compliance and may require engineered floodproofing or foundation design. For application steps and submission details, consult the City permit pages.Des Moines Building & Permit Information[2]

Penalties & Enforcement

The City enforces floodplain regulations through its building/inspection and code enforcement functions. Specific monetary fines, escalation for repeat or continuing offences, and exact non-monetary sanctions are not fully detailed on the cited municipal pages and the Des Moines Code link should be consulted for statutory penalty language.Des Moines Code of Ordinances[1]

  • Fines and civil penalties: not specified on the cited page.
  • Escalation for repeat or continuing violations: not specified on the cited page.
  • Non-monetary sanctions: stop-work orders, orders to remove nonconforming fill or structures, lien or abatement actions; specific remedies are administered by the City enforcement office.
  • Enforcer and inspections: the City Building Division and Code Enforcement perform inspections and accept complaints via the city permitting/contact pages.Contact Building/Permit Office[2]
  • Appeals and review: appeal routes (administrative review or municipal hearing) and statutory time limits are not specified on the cited page; applicants should request appeal procedures from the Building Division at application or denial.
  • Defences and discretion: permits, variances, and documented state or federal approvals (including FEMA-documented elevations) may be accepted; see permit guidance for variance criteria.
Exact fines or timelines should be confirmed with the City Building Division and the Code of Ordinances.

Applications & Forms

Required forms include the standard building permit application and, where applicable, a floodplain development permit application and an elevation certificate (FEMA form). The FEMA Elevation Certificate form and guidance are used for documenting finished floor elevations and floodproofing measures.FEMA Elevation Certificate[3]

  • Building permit application: name and purpose vary by project; fees and submission method are provided on the City permit page.City permit page
  • Floodplain development permit: where required, submit site plans and elevation documentation; fee amounts and filing deadlines: not specified on the cited page.
  • Elevation Certificate (FEMA form): used to certify elevations post-construction; follow FEMA instructions for completion.

Action Steps for Property Owners

  • Check FEMA flood maps for your property and identify the BFE before planning work.
  • Contact the City Building Division early to confirm permit triggers and required documentation.
  • Prepare site plans and, if necessary, engage a licensed engineer for elevation or floodproofing designs.
  • Submit permits and pay fees as required; retain elevation certificates and final inspection receipts for records and insurance purposes.
Early engagement with the Building Division reduces costly redesigns and enforcement risk.

FAQ

When is a floodplain development permit required?
When proposed work lies in a mapped floodplain or when it involves new construction, substantial improvements, or placement of fill that affects base flood elevations; confirm with the City Building Division.
Do I need an elevation certificate?
An elevation certificate is typically needed to document compliance with BFE requirements and for flood insurance rating; FEMA provides the standard form and instructions.FEMA Elevation Certificate[3]
What if I build without a permit?
Building without required permits can lead to stop-work orders, removal or modification orders, and possible civil penalties; contact the City Building Division to resolve noncompliance.

How-To

  1. Confirm flood zone and BFE for your property using FEMA maps.
  2. Contact the City Building Division to verify permit requirements and required documentation.
  3. Prepare and submit a complete permit application with site plans, elevations, and any engineering reports.
  4. Respond to review comments, schedule inspections, and provide an elevation certificate after construction is complete.
  5. Resolve any enforcement notices promptly and, if necessary, request appeal information from the Building Division.

Key Takeaways

  • Permits and elevations are typically required for new or substantially improved structures in Des Moines flood zones.
  • Follow FEMA elevation certificate procedures to document compliance and for insurance purposes.

Help and Support / Resources

  1. [1] Des Moines Code of Ordinances
  2. [2] Des Moines Building & Permit Information
  3. [3] FEMA Elevation Certificate

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