Niceville

Okaloosa County (county seat Crestview; major population centers Fort Walton Beach and Destin on the Gulf coast) regulates accessory dwelling units on unincorporated parcels through the Okaloosa County Land Development Code. The county hosts Eglin Air Force Base, one of the largest military installations in the United States, which constrains land use and ADU siting across a substantial portion of county territory. Gulf-coastal south Okaloosa operates distinctly from inland / north Okaloosa; Destin's Gulf-front corridor mirrors the 30A corridor in high-value tourist use. Florida has no statewide ADU preemption; § 163.31771 FS is permissive only. Pending SB 48 / HB 313 (2026 session) would establish a statewide ADU floor with a December 1, 2026 conformance deadline if enacted.

• Okaloosa County Land Development Code
• Florida Statutes § 163.31771 — Accessory Dwelling Units

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; Okaloosa's ordinance would need audit against the final statutory text if enacted (December 1, 2026 deadline in current drafts).

Okaloosa County administers a consequential overlay portfolio dominated by Eglin Air Force Base military-compatibility zones (which cover a substantial portion of the county), Gulf coastal overlays (CCCL, FEMA VE/AE zones) along Destin and Okaloosa Island, and Northwest Florida Water Management District wetland and stormwater jurisdiction. Eglin's Joint Land Use Study (JLUS) maps establish noise, safety, and airspace compatibility zones that constrain residential density and building height on affected parcels.

• Eglin Air Force Base — Joint Land Use Study (JLUS) zones — Eglin AFB's mapped noise-compatibility, accident-potential, and airspace-compatibility zones affect substantial areas of Okaloosa (and neighboring Walton and Santa Rosa counties). Residential density caps, noise-attenuation construction standards, and in some sub-zones outright residential-use prohibitions apply. An ADU on an affected parcel requires Eglin-compatibility review and may not be feasible in accident-potential Zone I.
• FEMA Special Flood Hazard Areas (SFHA) — Coastal A, VE, AE zones — Okaloosa participates in NFIP. Gulf-front parcels on Okaloosa Island, along Choctawhatchee Bay, and along Santa Rosa Sound face Zone VE, Coastal A, or AE designations. Post-Sally (2020) and post-Michael (2018) map revisions raised base flood elevations in some areas. ADU construction in Zone VE requires elevated construction, breakaway walls, and flow-through venting.
• Coastal Construction Control Line (CCCL) — Parcels seaward of the CCCL in Destin and along Okaloosa Island require FDEP CCCL permits in addition to county permits. An ADU on a CCCL parcel is subject to the same foundation and dune-protection standards as a primary structure.
• Northwest Florida Water Management District Environmental Resource Permits — Most of Okaloosa sits within NWFWMD jurisdiction. ADU site work affecting wetlands, adding impervious surface thresholds, or altering stormwater requires an ERP.
• Hurricane Wind Zone — approximately 140-150 mph ultimate design wind speed (Gulf coast) — Gulf-coastal south Okaloosa sits in approximately the 140-150 mph ASCE 7-22 ultimate design wind-speed zone (Risk Category II residential); inland Crestview closer to 130 mph. Impact-rated openings or shutters, hurricane clips, and elevated roof-attachment standards are required for all new construction.
• Blackwater River State Forest and associated conservation lands — Blackwater River State Forest occupies significant territory in northern Okaloosa. Parcels adjacent to the forest face additional review for habitat compatibility, fire-buffer management, and (in some areas) red-cockaded woodpecker habitat conservation.

Permits for ADUs on parcels in unincorporated Okaloosa County are issued by the Okaloosa County Growth Management Department. Okaloosa has nine incorporated municipalities (Crestview, Destin, Fort Walton Beach, Niceville, Valparaiso, Mary Esther, Shalimar, Cinco Bayou, Laurel Hill); most of the Gulf-coast Destin area is incorporated but substantial coastal-bay and inland territory is unincorporated.