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ADUs are allowed in Unincorporated Honolulu
Types:DetachedInternal

Accessory Dwelling Unit (ADU) Rules for Unincorporated Honolulu, HI

Is your property eligible for an ADU?

# of Parcels
322,216
Zoning districts
34
Avg Parcel Value
$1,335,938
Zoning Districts:
322,080 parcels · 34 districts
R-5
35%(112,373)
A-2
13%(42,550)
A-1
9%(29,341)
R-7.5
7%(22,338)
Other
36%(115,478)

ADU Rules

What can you build in Unincorporated Honolulu, HI?

Unincorporated Honolulu, HI follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.

Interior / Attached ADU Size Limits

  • –Maximum internal or attached ADU floor area is 500 sq ft on lots up to 4,999 sq ft, or 1,000 sq ft on lots 5,000 sq ft or larger.

Detached ADU Size Limits

  • –Maximum size of 500 sq ft for lots up to 4,999 sq ft, or 1,000 sq ft for lots 5,000 sq ft or larger.

Parking

  • –1 off-street space per ADU (in addition to the primary dwelling’s required spaces); no ADU parking within 0.5 miles of rail transit or in TOD districts; in Primary Urban Center or Ewa Development Plan areas, ADU parking is waived if the lot is within 800 feet of a city bus stop (waiver unavailable if already used for an ohana unit on the same lot); space may be compact and tandem when assigned to the ADU.

Rental Restrictions

  • –Short-term rentals prohibited; ADU may only be used for long-term residential occupancy; no bed and breakfast or transient vacation unit.

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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Is your property eligible for an ADU?

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