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.
Honolulu has no general 'impact fee' on residential ADUs but layered utility and capacity fees apply. BWS Water System Facilities Charges (WSFC) are assessed for added meters or capacity demands and vary by zone (typically several thousand dollars per dwelling unit equivalent). Department of Facility Maintenance Wastewater System Facility Charges (sewer connection / SFC) apply when an ADU adds wastewater load - currently around $4,500-$5,000 per single-family equivalent in residential districts under ROH Chapter 14. DPP building permit fees follow ROH Chapter 18 - roughly $40-$60 per $1,000 of construction valuation with separate plumbing, electrical, and mechanical permit fees. SMA permits add $300-$1,500 if applicable. Hawaii does not authorize school impact fees on residential construction. Property tax reassessment under the Real Property Assessment Division applies after construction.
Failure to pay BWS or sewer connection fees prevents service activation. Unpaid DPP fees prevent permit issuance. Hooking up to water or sewer without authorization violates ROH Chapter 14 and triggers fines plus disconnection. Skipping permits and fees triggers back-permit fees with double-fee penalties under ROH Chapter 18.
Honolulu, HI
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Honolulu, HI
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