ADUs are allowed in Unincorporated MauiTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Maui, HI
Is your property eligible for an ADU?
# of Properties
50,163
Owner-occupied
55%
Zoning districts
52
Avg Home Value
$1,007,332
Median Lot Size
0.24 acres
Avg Income
$100,931
Residential Types:
51,217 housing units
Single Family
73%
2-3 Family
2%
Apts (4+ units)
20%
Condos
4%
Zoning Districts:
80,282 parcels · 52 districts
AG
20%(15,876)
R-2
10%(8,382)
A-2
10%(7,690)
R-3
9%(7,071)
Other
51%(41,263)
ADU Rules
What can you build in Unincorporated Maui, HI?
Unincorporated Maui, HI 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 internal/attached in-home apartment size by lot area: 500 sq ft (≤7,499 sf), 600 (7,500–9,999), 720 (10,000–21,779), 840 (21,780–43,559), 960 (43,560–87,119), 1,200 (≥87,120).
Detached ADU Size Limits
- –Maximum detached accessory dwelling size by lot area: 500 sq ft (≤7,499 sf), 600 sq ft (7,500–9,999 sf), 720 sq ft (10,000–21,779 sf), 840 sq ft (21,780–43,559 sf), 960 sq ft (43,560–87,119 sf), 1,200 sq ft (≥87,120 sf).
Max Units
- –Maui island: <7,500 sq ft = 1 ADU; ≥7,500 sq ft = 2 ADUs.
- –Molokaʻi & Lānaʻi: ≥7,500 sq ft = 1 ADU.
- –R-O Zero Lot Line: 0 ADU.
Parking
- –1 space per ADU; off-street parking required; tandem parking allowed; carport/garage ≤500 sq ft; parking modifications/reductions allowed under §19.36B.110; Wailuku Redevelopment Area requires 1 space per ADU (MRA may adjust ratios by permit).
Rental Restrictions
- –Short-term and vacation rentals prohibited for ADUs; rentals must be 180 days or longer (long-term only).
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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Learn the key rules and size limits for ADUs