If you have been told about the “FEMA 50% rule” in St. Petersburg, the first thing worth knowing is that it is not 50% here. St. Petersburg uses 49%, and so do unincorporated Pinellas County and Redington Shores. Most of the other beach cities use 50%.
Both figures come from the same federal framework. FEMA sets 50% as the floor; local governments may adopt something stricter, and St. Petersburg did, to leave a margin for error. If someone has quoted you a budget based on 50% of your structure value in St. Pete, that budget is one percentage point too generous.
What does the FEMA 50% rule actually say?
If the cost of improving or repairing your home reaches the threshold percentage of the structure’s market value, the work is a substantial improvement — and the entire building must then be brought into compliance with current flood requirements, not just the portion being worked on.
There are two versions of the same test:
- Substantial improvement is voluntary work. The value is measured before the work begins.
- Substantial damage is involuntary — storm, fire, flood. The value is measured as of just before the damage occurred, and it applies regardless of cause.
The consequences are identical.
How do I find my 50% number?
The calculation uses the market value of the structure only. Not the land. Not the pool, dock, driveway or landscaping.
Pinellas County publishes the figure. Look up your parcel on the Property Appraiser’s site and open the FEMA/WLM Letter on the parcel page. If you believe that figure is wrong, you can submit a depreciated-value appraisal from a state-licensed appraiser — St. Petersburg requires it to have been completed within the last twelve months.
It is worth checking. We have seen determinations revised.
What counts toward the 50% limit — and what doesn’t?
Counts:
- All materials and labour
- Structural work
- Demolition and debris disposal
- Contractor overhead and profit
- Work you perform yourself, and donated materials — valued at commercial rates
- The cost of complying with code requirements
Generally does not count:
- Painting
- Carpet over existing finished flooring
- Storm debris removal
- Emergency tarping
Note what is in that first list. Overhead and profit are real money, and they count. So does everything you uncover once demolition starts. This is why projects scoped at 40% of value cross the line at 52%.
Do my past permits count against the 50% limit?
A cumulative look-back adds several permits together over a period of time and measures the total against a single threshold. Under one, a 2024 bathroom could consume the allowance you wanted for a 2026 addition.
In 2025 the Florida Legislature took up cumulative substantial improvement periods at the state level. You will find articles saying they are simply gone. We would be careful with that, for a specific reason: two Pinellas codes still contain them right now.
- Unincorporated Pinellas County — a rolling one-year period at 49%, with accumulation beginning when the permit for the first improvement is finalized.
- Redington Shores — a one-year cumulative period at 49%, with accumulation beginning at the first permitted improvement or repair after May 8, 2013.
Both are one-year periods, not the five-year window some reporting refers to, and both sit in code current through 2026 supplements.
We do not know how each department is applying these in light of the state law, and we are not going to guess on your behalf. If you are in unincorporated Pinellas or Redington Shores and a previous permit is being counted against you, put the question to the building department directly and ask for the answer in writing. If you are elsewhere in the county, this is unlikely to affect you — but it is still a two-minute question worth asking.
What happens if my project goes over the threshold?
The building must be brought into compliance with current flood requirements. Practically, that means the structure has to sit above the base flood elevation by a required margin.
Where a local margin is written into code: Madeira Beach requires base flood elevation plus 4 feet, St. Petersburg and Treasure Island plus 2 feet for one- and two-family homes, and Seminole plus 1 foot for residential. Gulfport, St. Pete Beach, North Redington Beach, Redington Beach and unincorporated Pinellas in AE zones set no local margin, so the Florida Building Code and ASCE 24 govern instead. Redington Shores currently has conflicting figures in its own code — plus 3 feet in the elevation section, plus 2 feet in the submittal section — so confirm that one with the town in writing.
Confirm any of these with the department issuing your permit. They change, and they differ street to street.
Your options at that point are to scope down and stay under, to convert the ground floor to non-habitable space and build compliant living space above it, to build new, or to have the house lifted by a specialist. We do all of those except the lift. There is more detail on each route on our flood zone construction page.
What about insurance money?
If your flood policy is with the NFIP and your community has declared your home substantially damaged, you may be able to claim Increased Cost of Compliance coverage — up to $30,000 toward elevating, relocating, demolishing or floodproofing.
One detail that is widely misunderstood and worth stating plainly: ICC sits inside the $250,000 building coverage cap, not on top of it. If your standard claim has already paid out $250,000, there is nothing left for ICC. Historically only a small fraction of paid NFIP claims have used ICC at all.
You have 60 days from the loss to file proof of loss, and four years from the community’s substantial damage declaration to complete the work.
Work out where you stand
We built a calculator that does the arithmetic for your jurisdiction and tells you plainly whether a project fits. It is an estimating aid, not a determination — only your building official can make the call — but it will tell you within a few minutes whether you are having an easy conversation or a hard one.
If it is the hard one, talk to us or call (727) 533-9515. We have been working inside these rules in Pinellas County since 1986.
Frequently Asked Questions
Does the FEMA 50% rule apply to voluntary remodels, or only storm damage?
Both. A voluntary remodel that reaches the threshold is a “substantial improvement,” measured against the structure’s value before work begins. Storm, fire or flood repairs that reach it are “substantial damage,” measured against the value just before the damage. The consequences are identical in both cases.
Does contractor overhead and profit count toward the 50% limit?
Yes. All materials and labor, structural work, demolition, contractor overhead and profit, and even work you perform yourself (valued at commercial rates) count. Painting, carpet laid over existing finished flooring, storm debris removal and emergency tarping generally do not. This is why projects scoped at 40% can cross the line at 52%.
Can I challenge the market value used in my 50% calculation?
Yes. The calculation uses the market value of the structure only — not the land — and Pinellas County publishes that figure on your parcel page. If you believe it is low, you can submit a depreciated-value appraisal from a state-licensed appraiser; St. Petersburg requires one completed within the last twelve months.
How much does FEMA’s ICC coverage pay toward elevating a home?
Up to $30,000 toward elevating, relocating, demolishing or floodproofing — but only if your NFIP community has declared your home substantially damaged, and the $30,000 sits inside your $250,000 building coverage cap, not on top of it. Proof of loss is due within 60 days; the work must be completed within four years.