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Zoning Guide

ADU Rules in Port St. Lucie, Florida

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ADU Rules in Port St. Lucie, Florida

Port St. Lucie is one of Florida's fastest-growing cities, located in St. Lucie County on the Treasure Coast between Orlando and Miami. Originally developed as a planned community, it has large residential lots and affordable housing compared to South Florida metros. Florida has no statewide ADU mandate — ADU policy in Port St. Lucie is set by the city's Land Development Code, not by state preemption.

Florida State Context — Permissive, Not Mandatory

Florida Statutes §163.31771 (enacted 2020) sets a permissive framework: it allows (but does not require) counties and municipalities to adopt ordinances permitting ADUs in single-family zones. The statute uses the word "may," not "shall." Each Florida city makes its own decision about whether and how to permit ADUs.

Always confirm Port St. Lucie's current ADU rules directly with the Planning & Zoning Department; do not rely on out-of-state ADU mandate analogies.

Permitted ADU Types

  • Detached ADU: Well-suited for Port St. Lucie's larger lot sizes
  • Attached ADU: Addition with own entrance and kitchen
  • Garage Conversion: Converting existing garage
  • Interior Conversion: Converting existing space

Size Limits

ADU Type Maximum Size
Detached ADU 1,000 sq ft or 50% of primary dwelling
Attached ADU 50% of primary dwelling floor area
Garage Conversion Existing footprint

Setbacks

Per Port St. Lucie Land Development Code:

  • Front: 20–25 feet minimum
  • Side: 5–7.5 feet minimum
  • Rear: 10–15 feet minimum

Height

  • Detached ADU: Maximum 25 feet or per zone standard

Waterway and Flood Considerations

Port St. Lucie has canals and is near the St. Lucie River. Some properties may be in FEMA flood zones. Verify flood zone status before planning.

Permit Process

  1. Check zoning: Verify via Port St. Lucie's online portal
  2. Flood zone check: If near waterways
  3. Submit plans: City of Port St. Lucie Building Division
  4. Building permit: Florida Building Code applies
  5. Inspections and CO: Required before occupancy

Contact

City of Port St. Lucie Building Division 121 SW Port St. Lucie Boulevard, Port St. Lucie, FL 34984 Phone: (772) 871-5132 Website: cityofpsl.com/government/departments/building

Disclaimer: Verify current Port St. Lucie Land Development Code requirements before starting any project.

More about Port St. Lucie Zoning

Building Permits — Cost & TimelineSetbacks & Height Limits

Sources

  1. City of Port St. Lucie Land Development Code·library.municode.com·Accessed 2026-04-07·Direct link

FAQ

Are ADUs allowed in Port St. Lucie, Florida?
Florida has no enacted statewide ADU mandate. Fla. Stat. §163.31771 is permissive (may adopt), not mandatory. HB 1343 (2023) is an agricultural-employee-housing bill that died in committee. ADU rules are set locally.
What makes Port St. Lucie good for ADUs?
Port St. Lucie has large lot sizes from its planned community origins, making detached ADUs feasible on many properties. As one of Florida's most affordable metro areas, it attracts retirees and families who may benefit from ADU rental income.