ADUs are allowed in SebastianTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Sebastian, FL
Is your property eligible for an ADU?
# of Properties
11,990
Owner-occupied
90%
Zoning districts
33
Avg Home Value
$314,566
Median Lot Size
0.23 acres
Avg Income
$68,484
Residential Types:
11,990 housing units
Single Family
95%
Other
5%
Zoning Districts:
14,597 parcels · 33 districts
RS-10
74%(10,830)
PUD-R
10%(1,493)
RM-8
3%(467)
RS-20
2%(276)
Other
10%(1,531)
ADU Rules
What can you build in Sebastian, FL?
Sebastian, FL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum of 1,000 sq ft or 50% of the principal dwelling’s under‑air gross floor area, whichever is less
Detached ADU Size Limits
- –Maximum 1,000 sq ft or 50% of the principal dwelling’s gross floor area under air, whichever is less.
Parking
- –No numeric minimum/maximum for ADU parking; on-site parking must support both units; single-family dwellings require 2 spaces (garage not counted); parking must be on the same lot; unlisted uses may use similar-use/APA standards with Planning & Zoning approval.
Rental Restrictions
- –Short-term/vacation rentals prohibited for both detached and internal ADUs.
- –Affordability affidavit required; unit must be rented at affordable rates to income-qualified individuals.
ADU State Law
What can you build in Florida?
- –Florida does not have a statewide ADU mandate. There is no state-level requirement for cities or counties to allow ADUs.
- –ADUs in Florida are regulated entirely at the local level. Some jurisdictions allow ADUs broadly, others allow them with strict conditions, and some prohibit them altogether.
- –Florida Statute 163.31771 is optional. It allows local governments to adopt ADU ordinances for affordable housing, but it does not require any jurisdiction to allow ADUs, and local governments may adopt ADU rules outside of this statute.
- –County and city rules may differ. In unincorporated areas, county zoning controls whether ADUs are allowed; within city limits, municipal zoning codes apply.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Florida municipalities
Rules change at the town line. Check the municipality your property is actually in.
Indian River County