If your property touches or overlaps a floodplain in Kansas City, don’t panic—but don’t break ground just yet either. Building in a floodplain is possible, but it comes with a long list of rules, regulations, and risks. Understanding how local codes, FEMA flood maps, and smart building practices all come together can save you time, money, and a lot of headaches.
1. Not All Floodplains Are the Same
Flood risk is divided into different zones, and not every property in a floodplain faces the same threat. The most important zone is the Special Flood Hazard Area (SFHA)—areas with a 1% chance of flooding in any given year (also called the 100-year floodplain).
These zones are shown on FEMA’s Flood Insurance Rate Maps (FIRMs), and they affect everything from what you can build to whether you need flood insurance. These maps are updated regularly as new data comes in. In Kansas City, local overlays and stricter regulations often apply on top of FEMA’s maps.
💡 Tip: Don’t rely on a basic FEMA map alone. MAR can help you interpret your specific zone and any city or county overlays that apply.
2. Building in a Floodplain Isn’t Illegal—but It Is Regulated
You can build in a floodplain, but you’ll need to meet strict conditions and get a Floodplain Development Permit from your local government. These permits are required for any man-made changes, including:
- New buildings or additions
- Excavating, grading, or paving
- Installing fences, pipelines, or even temporary storage
If you skip this step, you could be hit with violations, fines, or even risk having your entire community lose access to affordable flood insurance under FEMA’s National Flood Insurance Program (NFIP).
3. Base Flood Elevation (BFE) Is the Magic Number
The Base Flood Elevation (BFE) is the height that water is expected to reach during a 100-year flood. If you’re building in an SFHA, your lowest floor (including basements) must be built at or above the BFE.
Even better? Add 1 to 2 feet of “freeboard” above the BFE. This extra buffer improves safety, reduces insurance premiums, and makes your project more resilient long-term.
💡 Did You Know? FEMA doesn’t list BFE for every property in Zone A areas. In that case, your contractor or engineer will need to calculate it or request guidance from state floodplain officials.
4. Letters of Map Change: What to Do if the Flood Zone Seems Wrong
Sometimes, a property is mistakenly shown inside a flood zone. If you believe your land is mapped incorrectly, you can apply for a Letter of Map Amendment (LOMA) or a Letter of Map Revision Based on Fill (LOMR-F).
These are technical requests submitted to FEMA and usually require:
- Certified elevation surveys
- Proof that your structure or land is above the BFE
- In some cases, a history of recent changes like grading or added fill
While this process can feel overwhelming, MAR Building Solutions works with local engineers and surveyors who can help you gather what you need and make the case.
5. Your Building Design Matters More in Flood Zones
In a flood zone, how you build is just as important as where. Here are some smart building practices we often recommend for floodplain projects:
✅ Elevated Structures
Raise the building slab or use piers to stay above BFE. This helps protect interiors from flood damage.
✅ Flood-Resistant Materials
Use materials below BFE that can handle water, such as concrete, pressure-treated wood, and closed-cell insulation.
✅ Proper Venting
If you have enclosed spaces below BFE (like crawl spaces), FEMA requires flood vents—openings that let water flow in and out without pressure buildup.
✅ Roof Drainage and Slope
Using a roof system like Butler Manufacturing’s MR-24® standing seam roof helps direct water away and resists wind uplift—important when storms bring both rain and wind.
6. Flood Insurance Is Often Mandatory—And Changing
If your structure is in an SFHA and financed by a federally backed mortgage, flood insurance is required.
But even if it’s not, flood insurance is still a smart move. With FEMA’s Risk Rating 2.0, insurance costs are now calculated based on:
- How close your structure is to water
- Your foundation type
- Your building’s height compared to BFE
- Historical claims and replacement cost
The higher and better you build, the more you can save on your insurance premiums.
7. How MAR Building Solutions Helps You Build Smart in Flood Zones
- Site Evaluation: We interpret your FIRM, check overlays, and assess how flood risk will impact your plans.
- Permit Support: We help coordinate with the local floodplain administrator and civil engineers to get approvals.
- Smart Design: We design buildings using systems that meet or exceed Kansas City’s strict codes.
- Risk-Smart Construction: We follow best practices that align with FEMA and local standards, helping you position your building for better insurance outcomes.
Don’t Let a Floodplain Stop Your Project
Building in a floodplain doesn’t have to be a dealbreaker—but it does require the right plan, the right partners, and a strong understanding of both local and federal rules.
With MAR Building Solutions on your team, you’ll get a partner who knows how to navigate the codes, coordinate with the city, and construct smart, resilient buildings.
📞 Ready to build smart? Contact MAR Building Solutions today and let’s talk through your project, your map, and your best next step.
