Naples

Collier County regulates accessory dwelling units on parcels in unincorporated Collier through the Collier County Land Development Code (LDC), particularly Section 5.03 (Accessory Uses and Structures) and the use tables in Sections 2.03 and 4.02. Collier's ADU regime is relatively conservative: guest houses are permitted in most residential zones subject to unity-of-title and owner-occupancy conditions, but rental of the accessory unit is restricted in many zoning districts. Florida has no statewide ADU preemption; § 163.31771 FS is permissive only, so Collier's local standards control. Pending SB 48 / HB 313 (2026 session) would establish a statewide ADU floor with a December 1, 2026 local-ordinance conformance deadline if enacted.

• Collier County Land Development Code, Section 5.03 — Accessory Uses and Structures
• Florida Statutes § 163.31771 — Accessory Dwelling Units
• Collier County Growth Management Plan — Future Land Use Element

State-floor overlay: Florida has no statewide ADU preemption as of April 2026. § 163.31771 FS is permissive only. Pending 2026 bills (SB 48 / HB 313) would impose a statewide floor; if enacted, Collier's rental-restriction provisions and unity-of-title requirements would require audit against the final statutory text, with a December 1, 2026 conformance deadline in the current drafts.

Collier County administers a substantial portfolio of overlays that cut across the county and materially affect ADU siting. Collier's Gulf-coast exposure (Hurricane Ian 2022 produced catastrophic damage across Marco Island, Naples, and mainland Collier) places most coastal and low-lying parcels in high-velocity FEMA flood zones. Eastern Collier's Rural Fringe Mixed Use District and Rural Lands Stewardship Area use a transferable-development-rights / Stewardship Sending Area mechanism that constrains additional dwelling units on sending-area parcels. Protected-species overlays (Florida panther primary / secondary / dispersal zones, Big Cypress watershed protection) apply over much of eastern Collier.

• FEMA Special Flood Hazard Areas (SFHA) — Coastal A, VE, AE zones — Collier participates in the National Flood Insurance Program and in the Community Rating System. Coastal parcels on Marco Island, on the barrier islands, and along Naples Bay / the Gordon River face Zone AE, VE, or Coastal A designations. Post-Ian (2022) revised coastal flood maps raised base flood elevations in many areas. ADU construction in Zone VE requires pile or column foundations, breakaway walls, and flow-through venting, materially changing cost relative to inland parcels.
• Coastal Construction Control Line (CCCL) — Parcels east of the CCCL in Collier (oceanfront Marco Island, Gulf-facing Vanderbilt Beach, Pelican Bay, Park Shore) require FDEP CCCL permits in addition to county permits. ADU siting seaward of the CCCL is subject to the same strict foundation and dune-protection standards as a primary structure.
• Rural Fringe Mixed Use District (RFMUD) — Sending, Neutral, Receiving Lands — The RFMUD uses a transferable-development-rights (TDR) system. 'Sending Lands' parcels face stringent density caps and additional-dwelling-unit restrictions; owners can instead sell TDR credits to 'Receiving Lands' parcels that absorb the density. An ADU on a RFMUD Sending Lands parcel may be infeasible without TDR-based density buy-back mechanisms.
• Rural Lands Stewardship Area (RLSA) — Stewardship Sending/Receiving Areas — Eastern Collier's 195,000-acre RLSA uses a Stewardship Credit system designed to concentrate development in 'Stewardship Receiving Areas' (Ave Maria, future hamlets) while permanently protecting 'Stewardship Sending Areas' as agricultural, conservation, or habitat land. ADUs on Sending Area parcels are typically prohibited beyond existing bona-fide agricultural-residence allowances.
• Florida Panther Focus Area (Primary / Secondary / Dispersal Zones) — Much of eastern and northern Collier sits within mapped Florida panther habitat zones. Habitat-compatibility review can add review time for new construction and, in combination with RLSA or RFMUD designations, can restrict ADU additions. USFWS consultation may be triggered for federally funded, permitted, or Clean Water Act Section 404-triggered projects.
• South Florida Water Management District Environmental Resource Permits — Most of Collier sits within SFWMD jurisdiction, including the Big Cypress Basin. ADU site work that affects wetlands, adds more than a threshold area of impervious surface, or alters stormwater flow requires an SFWMD ERP. Collier's high water table and seasonal wet-season flooding make stormwater management a non-trivial cost on rural parcels.
• Hurricane Wind Zone — 160-170 mph ultimate design wind speed — Collier's Gulf coast sits in the 160-170 mph ASCE 7-22 ultimate design wind-speed zone for Risk Category II residential, one of the highest in Florida outside the HVHZ counties (Miami-Dade, Broward). All new construction, including ADUs, requires impact-rated windows/doors or shutters, hurricane clips, and roof-deck attachment schedules meeting the high-wind zone standards.

Permits for ADUs on parcels in unincorporated Collier County are issued by the Collier County Growth Management Department, which consolidates planning, zoning, building, and environmental review. Collier has three incorporated cities (Naples, Marco Island, and Everglades City); this record applies only to unincorporated parcels — including large swaths of eastern Collier (Golden Gate Estates, Immokalee, the Rural Lands Stewardship Area) and barrier-island unincorporated areas.