Solar Panel Rules in Honolulu, HI (2026)
Solar panel installation rules, mandate status, HOA restrictions, and permit process for Honolulu, HI.
Honolulu, HI is subject to a solar installation mandate for new construction. Solar panels are a permitted use on residential and commercial properties subject to standard building permit requirements. Property owners in Honolulu must obtain a permit before installing solar panels. HOA restrictions on solar are limited by state law. Honolulu offers streamlined permit review for residential solar installations. Below you will find the current solar mandate status, HOA rules, permit process, and any historic district restrictions that apply to solar installations in Honolulu.
Solar Mandate Status
Solar Mandate in Honolulu: A solar installation mandate applies in Honolulu. Hawaii Revised Statutes Section 196-6.5 requires solar water heating systems on all new single-family residential buildings in Hawaii unless a waiver is granted showing that a solar water heating system is not cost-effective. This is a solar mandate for solar water heating (not photovoltaic) on new construction. New single-family homes must have solar water heating unless an exemption applies.
HOA Restrictions
HOA Restrictions on Solar in Honolulu: Hawaii Revised Statutes Section 514B-22 and Section 515-3 limit HOA authority to restrict solar installations on residential properties. HOAs cannot prohibit solar energy systems but may impose reasonable requirements for aesthetics and placement that do not significantly impair system performance.
Permit Process
Permit Process in Honolulu: Honolulu DPP electrical permit required for solar PV. Hawaiian Electric (HECO) interconnection application required. HECO has implemented Smart Export tariff for solar net metering. Hawaii has one of the highest residential solar adoption rates in the US (25%+ of single-family homes). SolarAPP+ available for expedited residential solar permits.
Historic District Considerations
Historic District Considerations in Honolulu: Honolulu has historic districts in Downtown Honolulu (Chinatown/Downtown Historic District) and Kaimuki and other neighborhoods. Hawaii State Historic Preservation Division (SHPD) oversees state historic properties. Solar installations on historic properties may require review by the State Historic Preservation Officer. If your property is located in a historic district, contact the Honolulu Department of Planning and Permitting (DPP) before designing your solar system — placement restrictions may affect system output.
Frequently Asked Questions
Can I build an ohana unit (ADU) on my Honolulu property?
Yes. Hawaii Act 232 (2023) requires Honolulu to permit ADUs (called 'ohana dwelling units' locally) by right on single-family lots, with ministerial approval for code-compliant applications. Owner-occupancy requirements were eliminated statewide. The permit process is through Honolulu DPP. Honolulu is known for slower permit processing — plan for 6-12 weeks for plan check.
What is an ohana unit and how does it differ from a California JADU?
An ohana unit is Honolulu's term for an accessory dwelling unit — 'ohana' means family in Hawaiian. Unlike California's JADU (Junior ADU), which is specifically defined in California Government Code and is a California-only concept, Honolulu's ohana unit is a full ADU. Honolulu's ohana unit rules historically required owner-occupancy (now eliminated by Act 232) and were focused on housing extended family. The JADU concept from California does not apply in Hawaii.
Why are short-term rentals so restricted in Honolulu?
Honolulu has some of the strictest STR regulations in the US. A 2019 ordinance severely limited new Transient Vacation Unit (TVU) permits — new TVU permits are generally only available in resort-zoned areas like Waikiki and Ko Olina. Residential neighborhoods are largely closed to new STR applicants. Violations carry fines up to $10,000 per day — among the highest in the nation. This reflects community concerns about housing affordability and neighborhood character in Hawaii.
Does Hawaii have a solar mandate?
Yes — for solar water heating. Hawaii law (HRS Section 196-6.5) requires solar water heating systems on all new single-family residential construction unless a cost-effectiveness waiver is granted. This is one of the few states with a solar mandate. Additionally, Hawaii has some of the highest electricity rates in the US ($0.38+/kWh), making solar PV economically very attractive. Over 25% of Honolulu single-family homes have solar.
Is Honolulu city or county?
Both. The City and County of Honolulu is a consolidated city-county government governing the entire island of Oahu — including urban Honolulu, Waikiki, Pearl City, Kailua, Kaneohe, and all other communities on Oahu. The Honolulu Department of Planning and Permitting (DPP) handles all building permits, zoning, and planning for the entire island.
What is the Special Management Area (SMA) and does it affect my property?
The Special Management Area (SMA) is a coastal zone designation covering properties near Oahu's shoreline, administered under Hawaii's Coastal Zone Management Program. If your property is in the SMA (generally within 100-300 ft of the shoreline), certain development activities require an SMA permit in addition to standard building permits. The SMA is designed to protect Hawaii's coastal resources. Check with Honolulu DPP at honoluludpp.org for SMA boundary information.
Source: Honolulu Building Department — Solar Panel Permits. Last verified April 6, 2026. View source