ADU (Accessory Dwelling Unit) Permit in Honolulu (2026)
ADU (Accessory Dwelling Unit) permit requirements, fees, and process for Honolulu, HI. Find out if you need a permit and how to apply.
Yes, a ADU (Accessory Dwelling Unit) permit is required in Honolulu, HI.
A ADU (Accessory Dwelling Unit) permit is required in Honolulu, HI. The Honolulu Department of Planning and Permitting (DPP) handles permit applications for Honolulu. Below you will find the current thresholds, fees, and process for obtaining a adu (accessory dwelling unit) permit in Honolulu.
When Is a Permit Required?
When a ADU (Accessory Dwelling Unit) Permit Is Required in Honolulu: All ADU/ohana unit construction
Permit Fees
ADU (Accessory Dwelling Unit) Permit Fees in Honolulu: $5,000–$15,000 total fees. Estimated timeline: 6-12 weeks; ministerial approval per Hawaii Act 232.
Estimated timeline: 6-12 weeks; ministerial approval per Hawaii Act 232
How to Get a ADU (Accessory Dwelling Unit) Permit in Honolulu
Verify whether your project meets the permit threshold in Honolulu: All ADU/ohana unit construction.
Prepare your permit application and plans. Contact the Honolulu Department of Planning and Permitting (DPP) at https://www.honoluludpp.org/ for required documentation.
Submit your application online at https://www.honoluludpp.org/Permitting or in person at the Honolulu Department of Planning and Permitting (DPP).
Pay the permit fee: $5,000–$15,000 total fees.
Wait for plan check approval. Estimated timeline: 6-12 weeks; ministerial approval per Hawaii Act 232.
Schedule required inspections through https://www.honoluludpp.org/Permitting/Inspections. All inspections must pass before project is finalized.
Important: Hawaii Act 232 (2023) requires ministerial approval for qualifying ADUs. Honolulu DPP processes ADU permits. Board of Water Supply and HECO connection fees apply for new utility service.
Additional Requirements
- Board of Water Supply connection if new service required
- HECO interconnection for solar
Honolulu Department of Planning and Permitting (DPP)
Phone: (808) 768-8000
Website: https://www.honoluludpp.org/
Online Permits: https://www.honoluludpp.org/Permitting
Hours: Mon-Fri 7:45am-4:30pm
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 Code — ADU (Accessory Dwelling Unit) Requirements. Last verified April 6, 2026. View source