Home › ADU Rules by County › Clay County
How big a backyard home (accessory dwelling unit) can be in Clay County, who can build one, and who to call to confirm — from the county's published rules.
Know your main home's size? Get the exact limit for your lot in seconds.
| ADUs allowed? | Yes |
|---|---|
| Maximum ADU size | 1,000 sq ft or 40% of the main home, whichever is less |
| Minimum ADU size | 375 sq ft |
| Minimum lot size | 15,000 sq ft |
| Owner must live on site? | Yes — in the main home or the ADU |
| Manufactured home as an ADU? | Often allowed, subject to the county's ADU and zoning rules |
Allowed via conditional-use permit in PUD, AG, AR, AR-1, AR-2, RA, RB and RE districts. Owner must occupy the (homesteaded) primary residence; ADU cannot be sold separately or the lot subdivided to split it off. One ADU per single-family dwelling; may be detached or a garage apartment, and must be subordinate to and match the primary home. One extra off-street parking space required.
Source: Clay County ADU Requirements (county site); 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 Clay County before you build.
Confirm with Clay County: 904-278-4705 · 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. Allowed via conditional-use permit in PUD, AG, AR, AR-1, AR-2, RA, RB and RE districts. Owner must occupy the (homesteaded) primary residence; ADU cannot be sold separately or the lot subdivided to split it off. One ADU per single-family dwelling; may be detached or a garage apartment, and must be subordinate to and match the primary home. One extra off-street parking space required.
1,000 sq ft or 40% of the main home, whichever is less. The minimum ADU size is 375 sq ft.
Yes. Clay County requires the owner to live on the property, in either the main home or the ADU.
Often yes — many Florida counties allow a manufactured or modular home as an accessory dwelling unit, subject to Clay County's ADU size, lot, and setback rules. Confirm with the county for your parcel.
Keep Exploring
ADU rules for all 67 Florida counties · ADU-sized homes in our showroom
We'll confirm Clay County's rules for your property and help you pick a home that fits — free.
Start Here