Missouri
LOMA, LOMR-F and LOMR Flood Map Changes
Engineering and survey support to remove a property from a FEMA flood zone or revise a flood map.
What the work involves
A Letter of Map Amendment (LOMA) removes a structure or lot that is naturally above the base flood elevation, while a LOMR-F covers areas raised by fill, and a Letter of Map Revision (LOMR) changes flood hazard information based on new modeling or projects. LOMAs often need only survey elevation data, while LOMRs require hydraulic modeling by an engineer. FEMA charges no fee to review a LOMA but charges flat fees for most LOMR-F and conditional requests.
Local conditions we plan for
- New Madrid Seismic Zone in the southeast (Bootheel)
- Karst and sinkholes in the Ozarks
- Missouri and Mississippi River flooding
- Expansive clay soils
Building code: No statewide IBC/IRC; codes adopted by local jurisdictions (ICC adoption chart, April 2026).
When you need it
- Lender requires flood insurance but the house sits on high ground
- Lot raised with fill (LOMR-F)
- Development or channel project changes the floodplain (CLOMR and LOMR)
- Flood map appears inaccurate for a property
Frequently asked questions
How much does lOMA, LOMR-F and LOMR Flood Map Changes cost?
Across the US, lOMA, LOMR-F and LOMR Flood Map Changes usually costs $500 to $50,000. Estimate. A simple LOMA can be a few hundred dollars of survey work plus no FEMA fee; FEMA's fee schedule lists single-lot LOMR-F reviews at $425 online and $525 paper. Full LOMRs with hydraulic modeling can cost tens of thousands of dollars.
How long does lOMA, LOMR-F and LOMR Flood Map Changes take?
Plan on LOMA: about 60 days of FEMA review after a complete submittal; LOMR: several months or more from signed proposal to stamped deliverables, longer if a site visit, soil testing or a permit review cycle is involved.
Do I need a licensed PE for lOMA, LOMR-F and LOMR Flood Map Changes?
In most US jurisdictions, yes. When the work needs a permit, the plans, calculations or report usually must be sealed by a Professional Engineer licensed in the state where the project is located. Every deliverable we issue for permit is sealed that way.
How do I verify an engineer's license in Missouri?
Engineers practicing in Missouri are licensed by the Missouri Board for Architects, Professional Engineers, Professional Land Surveyors and Professional Landscape Architects. You can confirm a license number and its status in the board's public license search before you sign a contract.
Which building code applies in Missouri?
No statewide IBC/IRC; codes adopted by local jurisdictions (ICC adoption chart, April 2026). Cities and counties can add local amendments, which is one reason to hire an engineer who works in your area.
What site problems do engineers see most in Missouri?
Common issues include new Madrid Seismic Zone in the southeast (Bootheel), karst and sinkholes in the Ozarks, missouri and Mississippi River flooding and expansive clay soils.