St. Johns County regulates retaining walls through the Florida Building Code. A wall over four feet, measured from the bottom of the footing, or any wall supporting a surcharge, needs a building permit and engineered design. Walls that divert stormwater onto a neighbor create civil liability.
Retaining walls in St. Johns County fall under the Florida Building Code, administered by the county Building Department. A wall four feet or less in height, measured from the bottom of the footing to the top of the wall, and not supporting a surcharge such as a driveway, slope, or structure above it, is generally exempt from a building permit. A taller wall, or any wall carrying a surcharge, requires a permit and a Florida-licensed engineer's design. The county also applies Land Development Code setbacks. Drainage matters heavily here: much of the county is low-lying and flood-prone, and a wall that redirects stormwater onto an adjoining lot in Nocatee or coastal St.
Building a regulated retaining wall over four feet without a permit draws a stop-work order and penalty fees and can be ordered corrected or removed. A wall diverting drainage onto a neighbor invites a civil claim.
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