The 50% Rule, Explained: A Flood Rebuild Guide for Pinellas Homeowners

Last reviewed November 2026. Rules and contacts change, so always confirm with your city before you set a scope.

What the 50% rule is

In a FEMA flood zone, when the cost to repair damage or to improve a home equals or exceeds 50% of the market value of the structure, the home generally must be brought into compliance with current floodplain rules. In practice, that often means elevating the home or rebuilding it to current flood standards.

• Land value doesn't count. The comparison is to the value of the building only, not the lot.
• Damage and improvements are treated the same way. The rule applies whether you're repairing storm damage or remodeling by choice.
• Only your local officials make the call. FEMA doesn't decide whether a home is substantially damaged. Your city, or Pinellas County for unincorporated areas, does.

Read FEMA's explanation of substantial damage and improvement

Plan around the rule before you set your scope

1. Find out who your building department is. Several beach cities route permits through Pinellas County, and some have changed providers recently. The county's building department directory lists each one.
2. Know your structure's value. Cities typically start from the Pinellas County Property Appraiser's building value. If you believe it's too low, ask your city how it accepts an independent appraisal.
3. Get an elevation certificate. It shows how your lowest floor compares to the required flood elevation, which drives what compliance would cost.
4. Price the full scope, itemized. Cities count structural work, finishes, systems and the contractor's overhead and profit. Ask your contractor for a breakdown you can submit.
5. Talk to your city's floodplain staff early. Ask how they'll measure your project and what forms they want before you sign a contract.
6. Permit every repair and keep records. Take dated photos before and after work, and keep every invoice and lien waiver. If you disagree with a determination, Pinellas County and several cities offer a reassessment or appeal process.

Who to call, city by city

Pinellas County keeps a full directory of every city's substantial damage resources. Here are the coastal communities homeowners ask about most.

Before you hire a contractor for a rebuild

Coastal rebuilds have more moving parts than most projects: elevation, structural, utility and access work all have to line up with the permit drawings, and many projects change hands between an elevation contractor and a completion contractor. A few habits protect you:

• Compare bids that price the same scope, so the lowest number isn't just the smallest job.
• Confirm the contractor's license fits the work through the state and the Pinellas County Construction Licensing Board.
• Pay only for work that's actually in place, and collect lien waivers with each payment.
• Keep one record of photos, invoices, change orders and permit documents for the whole project.

This guide is general information for homeowners, not legal, insurance or engineering advice. Floodplain rules, thresholds and contacts vary by community and change over time. Confirm the current requirements for your property with your local building and floodplain officials before you commit to a scope or sign a contract.