Miami-Dade County requires building permits for retaining walls over 4 feet in height. Retaining walls must meet Florida Building Code structural requirements, with engineered designs required for taller walls. Drainage provisions must prevent water damage to adjacent properties.
Retaining walls in unincorporated Miami-Dade County are regulated under the Florida Building Code as adopted by the county. Walls up to 4 feet in height from the bottom of the footing to the top of the wall are generally exempt from permit requirements. Walls exceeding 4 feet require a building permit from RER and must be designed by a licensed Florida Professional Engineer. All retaining walls must include proper drainage (weep holes or French drains) to prevent hydrostatic pressure buildup. Walls adjacent to property lines must not direct water onto neighboring properties. In flood zones, retaining walls must comply with FEMA requirements and may not obstruct floodwater flow. Contact RER Building Division at (786) 315-2000.
Building a retaining wall over 4 feet without a permit violates the Florida Building Code. Unpermitted walls may require removal or retroactive permitting with engineering certification. Walls causing drainage problems to neighbors may trigger code enforcement action. Fines assessed by RER Code Compliance.
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