ADUs are allowed in Unincorporated MartinTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Martin, FL
Is your property eligible for an ADU?
# of Properties
65,885
Owner-occupied
64%
Zoning districts
96
Avg Home Value
$576,713
Median Lot Size
0.28 acres
Avg Income
$97,783
Residential Types:
65,885 housing units
Single Family
90%
2-3 Family
5%
Apts (4+ units)
2%
Other
3%
Zoning Districts:
84,566 parcels · 96 districts
PUD-R
29%(24,217)
IZ
13%(10,873)
R-2
7%(5,873)
R-2B
5%(4,543)
Other
46%(39,060)
ADU Rules
What can you build in Unincorporated Martin, FL?
Unincorporated Martin, 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 size: 900 sq ft in Transect Zones T3, T4-R, T4-O, and T5; in the Redevelopment Zoning District, maximum is 50% of the primary dwelling’s floor area (separate 850-sq-ft footprint cap also applies but is not modeled).
Detached ADU Size Limits
- –Maximum size is 900 sq ft of habitable space in T3, T4-R, T4-O, and T5; in CRA districts, maximum size is 50% of the primary dwelling’s floor area.
Max Units
- –1 ADU per lot (single-family/townhomes); 0 ADUs on duplex lots
Parking
- –1 space/ADU (Redevelopment Districts); on-street parking may count; SPARC payment-in-lieu in CRA/Redevelopment areas
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.
Martin County