Miami-Dade County, FL Fence Regulations: Retaining Walls (2026)
Key Facts
- Trigger
- Grading raises lot over 1.5 ft
- Requirement
- Retaining wall or equivalent feature
- Citation
- § 24-42.8(4)(b)(i)
- Reviewing agency
- DERM Director approval required
- Scope
- Countywide, including the 34 municipalities
Summary
Miami-Dade County requires a retaining wall or equivalent feature whenever site grading raises a lot more than 1.5 feet above the elevation of adjacent properties, per DERM's countywide stormwater rules for single-family and duplex lots.
4.If the proposed grading raises the property more than 1.5 feet compared to the elevations of the adjacent properties, a retaining wall or equivalent feature shall be required. ... 6.Where an existing or proposed site boundary elevation could allow runoff or discharge onto an adjacent property that has not been approved for stormwater retention pursuant to this chapter, retaining walls or other features to prevent offsite runoff shall be provided, subject to the Director's approval.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 135).
Full Breakdown
Under the county's stormwater standards for single-family and duplex lots (Miami-Dade County Code § 24-42.8(4)(b)(i)), site grading that raises a lot more than 1.5 feet above the elevation of neighboring properties triggers a mandatory retaining wall or equivalent feature, and the Director can also require a retaining wall or other feature wherever a site boundary elevation could send runoff onto a neighboring parcel not approved for stormwater retention. The Director of the Department of Regulatory and Economic Resources (DERM) signs off on the design. The section covers development orders countywide, including municipal-equivalent approvals, though projects inside the 34 cities follow the extent of county review set by Section 24-15.
Violations & Fines
Building without the required retaining wall, or grading that sends stormwater onto a neighboring parcel without DERM approval, is a code violation subject to Chapter 8CC civil penalties and stop-work orders.
Frequently Asked Questions
Does this rule apply inside cities like Miami or Hialeah?
How high can I raise my yard before I need a wall?
Sources & Official References
Other rules in Miami-Dade County
Florida rules heatmap·Compare Miami-Dade County to another location·View the Florida fence regulations overview
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