Home › ADU Rules by County › Okaloosa County
How big a backyard home (accessory dwelling unit) can be in Okaloosa County, who can build one, and who to call to confirm — from the county's published rules.
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| ADUs allowed? | Yes, with conditions |
|---|---|
| Maximum ADU size | Can't be larger than the main home |
| Owner must live on site? | Not confirmed in our records |
| Manufactured home as an ADU? | Often allowed, subject to the county's ADU and zoning rules |
County code doesn't use 'ADU' but permits guest houses and garage apartments in ALL zoning districts (LDC Sec. 2.21.05). One guest house per lot; must be detached from the principal dwelling (may connect via a covered walkway). Size limit: the guest house cannot exceed the total square footage of the principal structure. County must add a conforming by-right ADU under state law by Dec 1, 2026. Fort Walton Beach, Crestview, Destin, Niceville self-govern.
Source: Okaloosa County LDC Sec. 2.21.05 (guest houses / garage apartments); verified Jul 2026.
Before You Build
ADU rules are set by each county and city — Florida law (Fla. Stat. 163.31771) lets local governments allow ADUs but doesn't require it — and they can change, so always confirm the current rule with Okaloosa County before you build.
Confirm with Okaloosa County: 850-651-7526 · zoning department website ↗
Zoning is set locally and changes often. Answers are guidance only, not a permit guarantee. Always confirm with the local building/zoning department before purchase.
Common Questions
Yes, with conditions. County code doesn't use 'ADU' but permits guest houses and garage apartments in ALL zoning districts (LDC Sec. 2.21.05). One guest house per lot; must be detached from the principal dwelling (may connect via a covered walkway). Size limit: the guest house cannot exceed the total square footage of the principal structure. County must add a conforming by-right ADU under state law by Dec 1, 2026. Fort Walton Beach, Crestview, Destin, Niceville self-govern.
Can't be larger than the main home.
Our records don't confirm an owner-occupancy requirement for Okaloosa County — ask the county zoning department before you buy.
Often yes — many Florida counties allow a manufactured or modular home as an accessory dwelling unit, subject to Okaloosa County's ADU size, lot, and setback rules. Confirm with the county for your parcel.
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