What Are Hawaii Impact Fees?
Hawaii authorizes county impact fees under HRS §§ 46-141 to 46-148, requiring a needs assessment and proportionate-share analysis. The counties pair these with substantial water system facilities charges from their Boards of Water Supply, wastewater facility charges, park dedication requirements (HRS § 46-6), and school impact fees in designated districts under HRS ch. 302A.
Island construction costs are the nation's highest, and one-time charges reflect it — especially water facilities charges on Maui and Oahu. Hawaii figures on impactfees.org are model estimates adjusted for the state's cost environment; verify each county's current facility charge schedules early in due diligence.
Hawaii figures are illustrative estimates from our statewide cost model — calibrated to local construction costs and community size — rather than verified fee schedules. Use them for early budgeting and site comparison, and see our methodology for how estimates are built.
Counties Covered
Our calculator covers all 5 Hawaii counties:
Click any county to open the calculator pre-loaded with that jurisdiction.
Major Hawaii Markets
Click any market to open the calculator pre-loaded with that city.
Honolulu / Honolulu
BWS water facilities and wastewater charges anchor one-time costs on Oahu.
Kahului & Kihei / Maui
Maui's water meter availability and school fees are key cost drivers.
Hilo & Kona / Hawaii
Hawaii Island charges vary sharply between Hilo and the Kona growth coast.
Lihue / Kauai
Kauai layers water facilities charges with park and school requirements.
How the Calculator Works
- Pick your development type — Single-family, multifamily, commercial, industrial, or office.
- Search or pin your site — Enter an address or drop a pin anywhere in Hawaii.
- We identify the jurisdiction — City, county, and state are resolved automatically.
- Get an instant breakdown — Water, sewer, road, park, school, and fire fees by category — verified where researched, clearly-labeled estimates where not.