ADUs are allowed in Unincorporated NassauTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Nassau, FL
Is your property eligible for an ADU?
# of Properties
33,143
Owner-occupied
80%
Zoning districts
55
Avg Home Value
$455,210
Median Lot Size
0.49 acres
Avg Income
$94,350
Residential Types:
33,143 housing units
Single Family
98%
Other
1%
Zoning Districts:
58,377 parcels · 55 districts
PUD
33%(19,097)
OR
29%(16,825)
RS-1
9%(5,306)
RS-2
6%(3,741)
Other
23%(13,408)
ADU Rules
What can you build in Unincorporated Nassau, FL?
Unincorporated Nassau, 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
- –For an internal/attached ADU, the maximum area is 50% of the single-family home’s floor area (excluding garages).
- –For an internal/attached ADU, the maximum footprint is 800 sq ft.
Detached ADU Size Limits
- –Maximum size of 50% of the single-family home's floor area (garage space excluded).
- –Maximum total footprint of 800 sq ft for a detached accessory dwelling.
Max Units
- –1 ADU per single-family lot; none specified for duplex or multifamily parcels
Owner Occupancy
- –Owner must occupy the principal dwelling as primary residence
Parking
- –1 off-street space per ADU (in addition to primary dwelling); on-site parking required; no new curb cuts; detached-garage conversions must demonstrate parking stays at or above the minimum
Rental Restrictions
- –ADU rental allowed only when the main dwelling is owner-occupied with an active homestead exemption; no minimum lease term or short-term rental prohibition stated.
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.
Nassau County