Home › ADU Rules by County › Polk County
How big a backyard home (accessory dwelling unit) can be in Polk County, who can build one, and who to call to confirm — from the county's published rules.
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| ADUs allowed? | Yes |
|---|---|
| Maximum ADU size | 1,000 sq ft or 50% of the main home, whichever is less |
| 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 |
One detached ADU per residential lot (Ord. 25-0415). Must meet Florida Building Code on a permanent foundation. IMPORTANT: mobile/manufactured homes are explicitly PROHIBITED as ADUs — modular homes built to FBC are fully allowed. (Note: 2025 state law now defines manufactured homes built on/after Jan 1 2025 to HUD standards as ADUs, which may preempt this local ban — worth asking the county.) Short-term/vacation rentals banned; long-term (30+ day) rentals OK. Cities (Lakeland, Winter Haven) set their own rules.
Source: Polk County Ord. 25-0415; verified Jul 2026.
Inside City Limits
If the property is inside city limits, the city's ADU rules apply instead of the county's.
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 Polk County before you build.
Confirm with Polk County: 863-534-5985 · 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. One detached ADU per residential lot (Ord. 25-0415). Must meet Florida Building Code on a permanent foundation. IMPORTANT: mobile/manufactured homes are explicitly PROHIBITED as ADUs — modular homes built to FBC are fully allowed. (Note: 2025 state law now defines manufactured homes built on/after Jan 1 2025 to HUD standards as ADUs, which may preempt this local ban — worth asking the county.) Short-term/vacation rentals banned; long-term (30+ day) rentals OK. Cities (Lakeland, Winter Haven) set their own rules.
1,000 sq ft or 50% of the main home, whichever is less.
Our records don't confirm an owner-occupancy requirement for Polk 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 Polk County's ADU size, lot, and setback rules. Confirm with the county for your parcel.
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