Honolulu Wind Load Calculator

City and County of Honolulu, Hawaii — Hawaii (Special Wind Region)

Honolulu (Oahu) lies within Hawaii's Special Wind Region. ASCE 7-22 specifies a nominal 130 mph (Risk Category II) for most of Oahu, but the actual value varies significantly with terrain — channels, ridges, and the Pali frequently produce locally accelerated wind speeds. The Department of Planning and Permitting (DPP) often requires site-specific verification.

Honolulu Wind Speed & Design Parameters

• Design Wind Speed: ~130 mph (approximate) (ASCE 7-22 Risk Category II, ultimate 3-second gust)
• Exposure Category: C or D (Pacific / channels)
• HVHZ: No
• Building Code: City and County of Honolulu Building Code (IBC 2018 with Honolulu amendments, ASCE 7-16/22)
• Authority Having Jurisdiction: Honolulu Department of Planning and Permitting (DPP)

Approximate value — verify with AHJ. The ~130 mph (approximate) figure is a representative ASCE 7-22 Risk Category II value for Honolulu. Always confirm site-specific wind speed with the Honolulu Department of Planning and Permitting (DPP) or via ATC Hazards by Location before submitting a permit application.

Honolulu Permit Requirements

• Approximate Per ASCE 7-22: The 130 mph figure is a baseline Risk Cat II value for Oahu. Localized topographic effects (Kzt) can substantially increase effective design wind pressures. Always verify with Honolulu DPP.
• Special Wind Region: All of Hawaii is designated a Special Wind Region in ASCE 7-22, meaning standard map values may not capture site-specific conditions.
• Topographic Factor (Kzt): Honolulu sites near ridges, escarpments, or hilltops often require a Kzt > 1.0 — significantly increasing wind pressures. Our calculator supports Kzt inputs.
• Verify with AHJ: Honolulu DPP is the final authority on site-specific wind speed determinations. Use ATC Hazards by Location plus DPP guidance.

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Related Resources

• Hawaii Page
• ASCE 7-22 Calculator Methodology
• Window & Door Design Pressure Guide
• Wind Load Reports for Building Permits