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How big a backyard home (accessory dwelling unit) can be in Indian River 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 | 1,200 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 |
ADUs allowed on residentially zoned lots. One ADU per lot on parcels 200,000 sq ft or less. Must match the appearance of the principal structure (except garage conversions). Vero Beach and Sebastian set their own rules (Sebastian adopted its own ADU ordinance in 2025).
Source: Indian River County Code Ch. 911; 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 Indian River County before you build.
Confirm with Indian River County: 772-226-1237 · 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. ADUs allowed on residentially zoned lots. One ADU per lot on parcels 200,000 sq ft or less. Must match the appearance of the principal structure (except garage conversions). Vero Beach and Sebastian set their own rules (Sebastian adopted its own ADU ordinance in 2025).
1,200 sq ft or 50% of the main home, whichever is less.
Our records don't confirm an owner-occupancy requirement for Indian River 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 Indian River County's ADU size, lot, and setback rules. Confirm with the county for your parcel.
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