What is the Miami 21 code, and how does it affect my renovation?

Miami 21 is the City of Miami's form-based zoning code, adopted in October 2009 and effective May 2010 under Ordinance 13114. It replaced the Euclidean Zoning Ordinance 11000 and is administered by the City of Miami Planning Department before any Florida Building Code structural review takes place.

The code organizes the city along a SmartCode transect rather than separated use-districts. Transects you will encounter on a Miami remodel:

• T3 (Sub-Urban): T3-R restricted, T3-L limited, T3-O open. Single-family and duplex zones in Coconut Grove, Coral Way, Morningside, Shenandoah.
• T4 (General Urban): low-rise multifamily; common along Calle Ocho and Edgewater edges.
• T5 (Urban Center): mid-rise mixed-use along Coral Way commercial spines and Wynwood edges.
• T6 (Urban Core): T6-8 through T6-80 — Brickell, Downtown, Edgewater high-rise tower zones.
• D (Districts): D1 work-place, D2 industrial, D3 marine.
• CS (Civil Space) and CI (Civic Institution).

Each transect dictates building disposition (frontage type, setback, lot coverage), configuration (height in stories, parking placement), and function (allowed uses). For renovations the controlling provisions are typically Article 4 Table 2 (allowed uses by transect), Article 5 (specific transect standards), and Article 7 (Procedures). Article 7.1.2.5 covers Warrant approvals — administrative approvals signed by the planning director — and 7.1.2.8 covers Exception, which requires a Planning, Zoning, and Appeals Board (PZAB) public hearing.

Real-world impact on a renovation:

• Adding a second story in T3-R triggers principal-frontage and side-setback recalculation. Many older Coconut Grove cottages are non-conforming and rebuild scope is capped at 50% of the existing assessed value before the rebuild forces conformance under Article 7.2.8.
• Front-yard fences, driveways, and pergolas in Coral Way are governed by Article 5.3.
• Detached ADUs ("ancillary unit") have explicit standards in Section 3.3.6 and require lot size and parking compliance.

Schedule a free zoning verification at the Miami Riverside Center (444 SW 2nd Ave, 3rd floor) before drawing scope. Coastal High-Hazard Area, Historic, and NCD overlays stack on top of base transect rules.