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.
For a primer on how impact fees work, see our plain-English guide.
Hawaii figures are illustrative estimates from our statewide cost model (calibrated to local construction costs and community size) rather than sourced 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 see its fee schedule, or 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, sourced where researched, clearly-labeled estimates where not.