Understanding the 50% Rule
Substantial Improvement & Substantial Damage Requirements
FEMA's Substantial Improvement/Substantial Damage Information
Find an Elevation Certificate (If on record)
If your property is located in a FEMA flood zone and is below the required flood elevation, the 50% Rule may affect repairs, renovations, additions, or reconstruction. If the cost of work equals or exceeds 50% of the building's value, the structure may need to be brought into compliance with current flood regulations. Federal flood regulations require buildings that exceed the 50% threshold to comply with current flood protection standards.
Does the 50% Rule apply to you?
The 50% Rule may apply if:
- Your property is in a FEMA flood zone (A or V zone), also known as Special Flood Hazard Area (SFHA)
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Your building is below the required flood elevation.
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You are repairing damage, remodeling, renovating, or adding to the structure.
If the cost of the work equals or exceeds 50% of the building's value, you may be required to bring the structure into compliance with current flood regulations.
Will your proposed improvements/repairs trigger the 50% Rule?
Step 1: Is your building already flood compliant?
- Yes → The 50% Rule generally does not apply.
- Not sure → Check your Elevation Certificate.
- No → Continue to Step 2.
Step 2: Does your project exceed 50% of the building value?
- No → Standard permit review.
- Yes → Flood compliance requirements apply.
If the 50% Rule is triggered?
- Structure may need elevation improvements.
- Mechanical equipment may need to be elevated.
- Plans must demonstrate flood compliance.
- Additional documentation may be required.
National Flood Insurance Program (NFIP)
The NFIP requires that any structure located in the SFHA where the cost of proposed improvements or repairs equals or exceeds 50% of the value of the structure must be brought into full compliance with current flood damage prevention regulations.
These laws are required by the NFIP to protect lives and investment from future flood damages. Our community must enforce these laws in order for federally-backed flood insurance to be made available to Unincorporated Lee County residents and property owners.
SUBSTANTIAL DAMAGE means damage of any origin sustained by a structure whereby the cost of restoring the structure to its ‘before damage’ condition would equal or exceed 50% of the market value of the structure. (Note: The cost of the repairs must include all costs necessary to fully repair the structure to its “before damage” condition.)
SUBSTANTIAL IMPROVEMENT means any reconstruction, rehabilitation, addition, or other improvement of a structure, the cost of which equals or exceeds 50% of the market value of the structure (before any improvements are performed).
The predicted level of flooding measured from mean sea level. The elevation that water is anticipated to rise to in the event of a 1% annual chance flood (aka “Base Flood”). Since this is the elevation water is expected to rise to, the first livable floor should exceed BFE in order to avoid damaging effects from flooding. Base Flood Elevations are shown on Flood Insurance Rate Maps (FIRMs). This required elevation information is vital for new construction and some remodeling and renovation projects. Also, for flood insurance purposes, the relationship between the BFE and the structure's actual elevation (among other things) determines the flood insurance premium. On another note, if a building is "substantially damaged" or "substantially improved," it must be brought into full compliance with Unincorporated Lee County’s flood damage prevention regulations, including elevating not just to BFE but also to Freeboard. |
Freeboard is a factor of safety (usually expressed in feet) above a required Base Flood Elevation for floodplain management purposes. Newly built (or substantially improved/substantially damaged) structures located in the Special Flood Hazard Area are required to build one additional foot above the FEMA BFE. Freeboard results in significantly lower flood insurance rates due to lower flood risk. |
Permit submittal reviews:
At the time of permit application, Unincorporated Lee County will use the assessed value of your structure (excluding the land) recorded by the Property Appraiser’s Office. If you disagree with the Property Appraiser’s Valuation of the structure, you may engage a State of Florida licensed property appraiser to submit a comparable property appraisal for the depreciated value of the structure.
We will evaluate the cost of improvements or repairs and determine if they are fair and reasonable. For damage repairs, pre-storm prices and rates will be utilized.
The cost of improvements or repairs does not include items not considered a permanent part of the structure (i.e., plans, surveys, permits, sidewalks, pools, screens, sheds, gazebos, fences, etc.).
If it has been determined that your structure has incurred “substantial damage” or your proposed remodel/renovation work is considered to be "substantial improvement”, flood compliance must now be achieved. If you suspect that your structure may already be compliant, please coordinate with staff. (Note: typically an Elevation Certificate will prove whether or not a structure is flood compliant. Before paying for a new Elevation Certificate, speak with a certified floodplain manager currently on staff). Note: Garages and Carports are not considered to be the "lowest floor".
If your proposed project is too close to the 50% threshold to determine if repair/renovations is considered to be Substantial Improvement, you have the option to submit a detailed cost estimate for the addition, remodeling, reconstruction of the structure, prepared and signed by the contractor. The contractor may sign an affidavit indicating that the cost estimate submitted includes all damages or all improvements to your structure, not just structural. If the owner is the contractor, the owner may elect to submit the detailed cost estimate and sign the owner/builder affidavit associated with the Detailed Cost Breakdown Package.
If the proposed project is not flood compliant, the building plans must be prepared to show how the building is to meet compliance.
If structure is located in a V-zone, Coastal High Hazard Area, or if the non-residential building is to be flood proofed, these building plans must be prepared and certified by a registered professional engineer or architect.
Donated or Discounted Materials
The value placed on materials should be equal to the actual or estimated cost of all materials to be used. Where materials or servicing equipment are donated or discounted below normal market values, the value should be adjusted to an amount equivalent to that estimated through normal market transaction.
Labor Value
The value placed on labor should be equal to the actual or estimated labor rate charged for repairs of all damages sustained by the structure. Labor costs (Number of Hours Worked x Hourly Rate) must be included in the Detailed Cost Breakdown Package. This also applies to non-reimbursed (volunteer or donated) labor. Labor rates not explicitly listed will be estimated at the current market value for local or regional construction industry wage scales for any work performed. The most current data from U.S. Bureau of Labor Statistics – Occupational Employment and Wages in Cape Coral-Ft. Myers should be used as a guideline for compliance. Please inquire with staff for the current acceptable average labor rate cost estimate to use.
Submit a Get Help form online to request more information.