Key Takeaways
- Properties in a special flood hazard area typically need a floodplain development permit before any rebuild or major renovation.
- Most floodplain rebuilds must achieve an elevation at least two feet above the base flood elevation.
- These rules apply regardless of whether damage came from Hurricane Helene or another cause.
- A floodplain determination should happen early, before finalizing a renovate-or-rebuild decision.
Properties located within a special flood hazard area in Buncombe County generally need a floodplain development permit before construction begins, and most rebuilds in these areas must achieve an elevation at least two feet above the base flood elevation. These rules exist to reduce future flood damage, but they significantly affect the cost and feasibility of repairing versus rebuilding a damaged home. This page explains what these requirements mean in practice.
What determines if you’re in a special flood hazard area
Flood hazard determinations come from FEMA flood maps, which identify areas at elevated risk of flooding based on historical data and modeling. A property’s flood zone designation determines which rules apply, and this designation can sometimes change as FEMA updates its mapping, particularly after a major flood event generates new data about how water actually moved through an area. Confirming your property’s current flood zone designation is the necessary first step before planning any floodplain-area rebuild.
The floodplain development permit
Before construction begins on a property within a special flood hazard area, a floodplain development permit is typically required in addition to standard building permits. This permit review considers how the proposed construction addresses flood risk, including elevation requirements and any effect the construction might have on floodwater flow across the property and surrounding area.
This additional review step adds time to the permitting process beyond what a standard rebuild outside a floodplain would require, so building this into your project timeline from the start avoids frustrating delays.
Base flood elevation requirements
Most floodplain construction in Buncombe County must achieve an elevation at least two feet above the base flood elevation, a standard set to provide a safety margin beyond the minimum FEMA requirement. This means the lowest floor of a home, including any enclosed area below the main living space, generally needs to sit at or above this elevated height.
For an existing home that sits below this elevation, achieving compliance can mean elevating the entire structure, which is possible but often costly, or, in some cases, redesigning the rebuild with a new foundation at the correct height from the start. This requirement is a major factor in the renovate-versus-rebuild decision covered in our post on renovate versus rebuild in Asheville.
How elevation requirements affect rebuild costs
Building a new elevated foundation from the start typically costs less than raising an existing structure to meet the same elevation requirement. This is one of the clearest financial arguments for choosing to rebuild rather than repair when a property has sustained significant foundation damage and also needs to meet current elevation standards. Our broader guide to rebuilding after Hurricane Helene covers how this fits into the overall rebuilding decision.
Substantial damage and substantial improvement rules
Floodplain regulations typically include a concept often called the substantial damage or substantial improvement rule, which requires a structure to be brought into full compliance with current floodplain standards if the cost of repair or improvement exceeds a certain percentage of the structure’s value. This rule can mean that a home with extensive storm damage must meet current elevation requirements even if it previously did not, simply because the repair cost triggers this threshold.
Confirming whether your specific situation falls under this rule early in the planning process, ideally through Buncombe County’s floodplain administration office, shapes the entire scope and cost of your rebuild.
Combining floodplain compliance with fee reduction programs
Buncombe County’s Reduce to Rebuild program can help offset some of the permitting costs associated with floodplain compliance for eligible storm-damaged primary residences. Our post on the Reduce to Rebuild program covers how this fee reduction works alongside the floodplain permitting process.
Working with a contractor experienced in floodplain construction
A contractor familiar with Buncombe County’s floodplain requirements can help you navigate the permit process, understand how elevation requirements affect your specific rebuild, and design a foundation that meets code from the start rather than discovering compliance issues mid-project. Start that conversation through the contact page.
Summary
Properties within a special flood hazard area in Buncombe County generally need a floodplain development permit and must achieve an elevation at least two feet above the base flood elevation for new construction. Substantial damage rules can require even a repaired home to meet current elevation standards if repair costs exceed a certain threshold relative to the home’s value. These requirements often make rebuilding with a new, properly elevated foundation more practical than raising an existing structure. Homeowners in a floodplain should confirm their flood zone designation and applicable requirements early in the planning process. Reach out through the contact page to discuss your specific property.
Frequently Asked Questions
Do I need a special permit to rebuild in a floodplain?
Yes, typically. Properties within a special flood hazard area generally need a floodplain development permit in addition to standard building permits. This review considers elevation requirements and how construction might affect floodwater flow across the property.
How high above base flood elevation must I build?
Most floodplain construction in Buncombe County must achieve an elevation at least two feet above the base flood elevation. This applies to the lowest floor of the home, including any enclosed area below the main living space.
What is the substantial damage rule?
This rule generally requires a structure to meet current floodplain compliance standards if repair costs exceed a certain percentage of the structure’s value. It can mean a storm-damaged home must meet elevation requirements it previously did not, based on the scale of the needed repairs.
Is it cheaper to elevate an existing home or build a new elevated foundation?
Building a new foundation at the correct elevation from the start typically costs less than raising an existing structure to meet the same requirement. This is a significant factor favoring rebuilding over repair for homes with both foundation damage and elevation compliance needs.
How do I find out if my property is in a special flood hazard area?
Flood zone designations come from FEMA flood maps, which can be reviewed through Buncombe County’s floodplain administration office. Confirming your property’s current designation is an essential first step before planning any floodplain-area rebuild or major renovation.
