If repairs or improvements to a home in a FEMA flood zone exceed 50% of the structure’s value, the entire building must meet current flood and building codes, often requiring elevation or full-code upgrades. Florida’s 50% Rule: What Homeowners Must Know Up Front The 50% Rule is one of the most misunderstood parts of Florida’s building regulations, and it can stop your remodel or rebuild before it even begins. Here’s what you need to know in plain language: It applies when repairs or renovations exceed 50% of your home’s structure-only value (not including land). Once triggered, you must bring the entire structure up to today’s codes, including FEMA flood standards. It’s enforced in flood-prone zones (AE, VE) and handled by your local building department. Even improvements, not just damage, can activate it, kitchen remodels, additions, or major system upgrades all count. All costs count toward the 50%: labor, permits, materials, even owner-supplied work. If triggered, expect new permits, possible elevation, and often higher-than-expected costs. This rule affects what you can build, when you can build, and how much it costs, often catching homeowners off guard.  Older homes may not meet requirements affordably, making early planning and clear cost awareness critical.