What the rule says
If your home is in a special flood hazard area and the cost of improvements reaches 50% of the building's market value (the building, not the land), the whole structure must be brought up to current flood rules, which usually means elevating it. It is a federal rule applied locally, and the local part is what matters.
City of Naples versus unincorporated Collier
| City of Naples | Unincorporated Collier County | |
|---|---|---|
| Past work | The city changed its rule in December 2024 (Ordinance 2024-15508 removed its 12-month lookback). We confirm the current rule with the city for every address. | Counted permit by permit |
| Who decides | City building and floodplain staff | County floodplain management |
Because the two offices count past work differently, the same remodel can land on different sides of the line depending on your address. Your tax bill says which jurisdiction you are in.
How we check it at the estimate
- We confirm your jurisdiction and flood zone from the address.
- We pull the building value from the Collier County Property Appraiser.
- We total your planned work, plus any past permitted work the city or county still counts under its current rule.
- The result goes into your estimate in writing, with the margin to the 50% line.
If you are close to the line we say so before you choose finishes, because a different scope can keep you under it.
What this page is not
Not legal or engineering advice, and not the jurisdiction's own determination. The city or county makes the final call when the permit is reviewed. We recheck the city and county rules before every estimate, because they change.
