Compare ADU zoning rules across 1 Hawaii cities. Average ADU score: 7.0/10.
| City | Max Size | Setbacks | Permit Fees | Build Cost | 1BR Rent | Score |
|---|---|---|---|---|---|---|
| Honolulu | 500 sq ft (lots under 5,000 sq ft); 1,000 sq ft (lots 5,000 sq ft and larger) — updated by Ordinance 25-2 | Standard building code requirements | $3,000-$8,000 estimated (higher utilities/inspection costs) | $150,000-$300,000 | $1,600-$2,200 | 7/10 |
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