ADU Impact Fees: Honolulu vs Urban Honolulu
How do adu impact fees rules compare between Honolulu, HI and Urban Honolulu, HI?
Honolulu, HI
Honolulu County
Honolulu does not impose a dedicated ADU impact fee, but Board of Water Supply (BWS) Water System Facilities Charges and Department of Facility Maintenance sewer assessment fees commonly add several thousand dollars per ADU. Standard DPP building permit fees scale to construction valuation. Bill 7 ADU applicants also pay a per-unit infrastructure assessment.
View full Honolulu rules →Urban Honolulu, HI
Honolulu County
No data available yet for Urban Honolulu.
Key Facts Comparison
| Fact | Honolulu | Urban Honolulu |
|---|---|---|
| Dedicated ADU Impact Fee | None | - |
| Sewer SFC | ~$4,500-$5,000 per unit | - |
| BWS WSFC | Several thousand per DUE | - |
| Building Permit | $40-$60 per $1,000 valuation | - |
| School Impact Fee | Not authorized in HI | - |
Highlighted rows indicate differences between cities.
Honolulu FAQ
How much does it cost in fees to permit a Honolulu ADU?
Expect $8,000-$15,000+ in city fees including BWS water charges, sewer connection fees, and DPP building/plumbing/electrical permits. Lots needing new water meters or sewer laterals pay significantly more. Property tax also increases after construction.
Does Hawaii have school impact fees on ADUs?
No. Hawaii state law does not authorize school impact fees on residential construction. The Department of Education is funded through state general revenue, not local impact fees.
Urban Honolulu FAQ
No FAQs available.
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