ADUs are allowed in Unincorporated CollierTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Collier, FL
Is your property eligible for an ADU?
# of Properties
106,974
Owner-occupied
73%
Zoning districts
158
Avg Home Value
$765,804
Median Lot Size
0.23 acres
Avg Income
$105,708
Residential Types:
106,974 housing units
Single Family
92%
2-3 Family
2%
Other
6%
Zoning Districts:
346,467 parcels · 158 districts
PUD
44%(152,624)
E
13%(43,426)
RPUD
6%(20,732)
RMF-6
5%(17,111)
Other
32%(112,574)
ADU Rules
What can you build in Unincorporated Collier, FL?
Unincorporated Collier, FL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: By Right
Detached ADU Size Limits
- –Maximum size is 40% of the principal dwelling’s air‑conditioned living area; does not apply within the GTZO overlay.
- –Accessory buildings may not occupy more than 5% of the total lot area; this caps the detached ADU size.
- –Within the GTZO overlay, the maximum guesthouse size is 750 sq ft.
Owner Occupancy
- –ADU may not be occupied by owner if main residence is leased.
Parking
- –2 spaces/ADU; max 2.5 per dwelling unit (outdoor spaces, Mixed Use Urban Residential); no ADU-specific waivers; general countywide rules apply
Rental Restrictions
- –ADU rentals must be 1 month or longer; short-term (<30 days) prohibited (detached and attached).
- –If the main dwelling is leased, the guest accommodation may not be owner-occupied (no simultaneous leasing/owner-occupancy).
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.
Collier County
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