Seminole County, FL Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in Seminole County, FL, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Trigger
- substantial improvement/damage determination
- Governing section
- Sec. 104.2.3
- Flood standard applied
- FBC Sec. 1612 or R322
- Variance route
- local flood plain ordinance, Sec. 117.1
- Statutory basis for variances
- FS Sec. 553.73(5)
- CO requires
- as-built lowest floor elevation doc
Summary
Before approving repairs, additions or alterations to an existing building in a Seminole County flood hazard area, the building official must decide whether the work counts as substantial improvement or repair of substantial damage. A yes triggers full compliance with the Florida Building Code's flood-resistant construction standards under Section 1612 or R322.
104.2.3 Determination of substantially improved or substantially damaged existing buildings and structures in flood hazard areas. For applications for reconstruction, rehabilitation, repair, alteration, addition or other improvement of existing buildings or structures located in flood hazard areas, the building official shall determine if the proposed work constitutes substantial improvement or repair of substantial damage. Where the building official determines that the proposed work constitutes substantial improvement or repair of substantial damage, and where required by this code, the building official shall require the building to meet the requirements of Section 1612 or R322 of the Florida Building Code, Residential, as applicable.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 23 Update 1 | Land Development Code: Supplement 2).
Full Breakdown
3 of the county's Building and Construction Code Appendix A puts the burden on the Seminole County building official to make a threshold call whenever an owner applies to reconstruct, rehabilitate, repair, alter, add to or otherwise improve an existing building located in a mapped flood hazard area: does the proposed work amount to a substantial improvement, or a repair of substantial damage. If the answer is yes, and the code otherwise requires it, the structure must be brought up to the flood-resistant construction requirements of Section 1612 of the Florida Building Code, Building, or Section R322 of the Florida Building Code, Residential, whichever applies.
2 makes clear that permit exemptions listed elsewhere in the code never authorize work performed in violation of law, including work in any special flood hazard area, and exempted work still has to satisfy the local floodplain management ordinance. 73(5), Florida Statutes. 2(6) requires the certificate of occupancy file to include documentation of the as-built lowest floor elevation.
Violations & Fines
Undertaking substantial improvement or repair of substantial damage in a flood hazard area without the building official's Section 104.2.3 determination, or without meeting the resulting Section 1612 or R322 flood-resistant construction standards, exposes the work to a stop-work order under Section 115.1, a notice of violation under Section 114.2, and penalties under Section 114.4; the building official can also withhold the certificate of occupancy under Section 111.1 until the flood elevation documentation required by Section 111.2(6) is on file.
Frequently Asked Questions
Who decides if my flood-zone renovation counts as a substantial improvement?
What happens if my project is ruled a substantial improvement?
Can I get a variance from the flood construction rules?
Sources & Official References
Other rules in Seminole County
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