What the rule measures
The rule compares two numbers: the cost of the work and the market value of the building alone. The land does not count. A lot on the water can be worth far more than the house on it, but only the structure goes into the math.
Take any older house in a flood zone. Whatever the building is worth without the lot, half of that is the line. A remodel that stays under it is a remodel. A remodel that reaches it is a substantial improvement, and from that point the house is treated like new construction for flood purposes.
Storm repairs count too
Repair work after a storm is measured the same way. Many owners in low neighborhoods learn this after a hurricane, when the repair estimate lands next to the appraisal.
Who makes the call
The city makes that call when it reviews the permit, not the contractor. What we can give you is a firm demolition price to set next to the repair number.
Why the rule leads to teardowns
Bringing a low house up to flood code is the hard part. Most older Miami houses are CBS block on a slab poured at grade, and the problem sits at the base of the house, in the floor itself.
So owners do the math and many decide to knock down and rebuild. The new house goes up at the required elevation from the start, and the old one comes down in a few days of excavator work. The pattern shows up most on the barrier islands, in Miami Shores and Bay Harbor, on the Las Olas Isles in Fort Lauderdale and along coastal Hollywood.
Miami Beach adds up a full year of work
Miami Beach counts improvements over a running 12-month period, not permit by permit. A new roof in March and a kitchen in September go into the same total. Splitting a remodel into small permits does not keep it under the line there. What else changes for a teardown on the island is on our Miami Beach demolition page.
Florida law protects the right to tear down in a flood zone
Florida Statute 553.79(25) limits what a city can do when an owner wants to demolish a single-family house in a flood zone. The house has to be in a coastal high hazard area, a moderate flood zone or a special flood hazard area, and its lowest finished floor has to sit at or below the base flood elevation, or below a higher local elevation when the city sets one.
When those conditions are met, local rules cannot prohibit or restrict the demolition permit. Review is administrative only, with no public hearing, and the city cannot add extra requirements to the new house because of the teardown.
The protection has exceptions:
- houses listed on the National Register of Historic Places;
- houses designated historic on or before January 1, 2022;
- houses designated after that date, unless the owner consented to the designation.
For a house in one of those groups, the historic review in cities like Coral Gables and Miami Beach still applies. We never promise a demolition in a historic district.
Repair or tear down: how to compare
Put the two paths side by side with real numbers. On one side, the repair or remodel estimate, checked against half the building value. On the other, the teardown plus the new house built to flood code.
Our side of that comparison is simple. We price a teardown by the square feet of the house, and a 40 × 35 ft block house is 1,400 sq ft. Put your measurements into our teardown price calculator to see the number, and read what the work covers on our house demolition service page. The city's permit fee and the asbestos survey are added on top.
Frequently asked questions
Does the land value count toward the 50% rule?
No. Only the market value of the building goes into the calculation. A house on a valuable waterfront lot can still cross the line with a modest remodel, because the lot is left out.
Does the FEMA 50% rule force me to tear down?
No. It forces the house to meet flood code for new construction once the work reaches half the building value. Tearing down and rebuilding is one way to get there, and many owners of low CBS houses take it.
Do hurricane repairs count toward the 50% line?
Yes. When repairing storm damage costs half the building value or more, the house is substantially damaged. The repairs then have to bring the whole house up to flood code.
Can my city block a teardown of a flood zone house?
Under Florida Statute 553.79(25), a city cannot prohibit or restrict the demolition of a single-family house in a flood zone when its lowest floor sits at or below the base flood elevation. Houses on the National Register and some locally designated historic homes are the exception.
Keep reading
Reviewed
