ADU vs. Ohana in Hawaii: Could One Be Your Next “Yes”?
If you’ve been wondering about an ADU vs. an ohana unit in Hawaii, you’re in good company.
Back in 2023, I wrote about accessory dwelling units and heard a lot of “maybe someday.” Well — someday might be here! Whether it’s bringing Mom and Dad closer, giving your kids a place to launch, or opening up a little extra income, there’s never been a brighter time to dream about adding a second home to your O’ahu property.
And here’s the happy news: the rules are loosening up. The State of Hawaii (Act 46, 2024) is requiring counties to allow more ADUs on residential lots by the end of 2026, and the City & County of Honolulu has been updating its Land Use Ordinance (Ordinance 25-2) to make accessory dwelling units easier to build — including proposals to relax the owner-occupancy rule and allow an ADU and an ohana on the same lot. The details are still settling into place, so it’s worth checking the City’s current requirements (more on that below) — but the direction is clear: if you got a “no” a few years ago, building an ADU in Hawaii might just be a joyful “yes” today!
It still takes a budget and a plan, of course. So let’s keep it simple — three feel-good steps to get you started.
ADU vs. Ohana: What’s the Difference in Hawaii?
These two get mixed up all the time, but here’s the easy way to remember it. An ADU (accessory dwelling unit) has a full kitchen and can be rented long-term (think 6-month-plus leases, not vacation rentals) — great if you love the idea of flexibility and a little extra income down the road. An ohana unit is your family’s cozy spot, typically with a wet bar rather than a full kitchen. Housing a loved one? An ohana may be your sweet spot. Want rental options later? An ADU is your friend. The City’s building permits pre-application page is a great place to compare the two for your O’ahu property.
Step #1: Dream Up the Purpose
Even on a smaller lot — yes, even with our charming older homes and single-wall construction here in Hawaii — there’s often more room to work with than you’d think! Start with the fun questions: What’s your budget, and how will you fund it? Then picture what this space will do. A rental? A welcoming spot for Grandma? A launchpad for the kids? Let that vision lead the way. Here’s a quick guide to planning and building an ADU in Honolulu to get those ideas flowing.
Step #2: Get Pre-Approved (It’s Easier Than You Think!)
Knowing your intended use early keeps everything smooth — for legal reasons, assessments, and everyone’s privacy. ADU, ohana, or a simple addition to your existing home? This friendly little pre-check form helps you find your perfect match. One small step, big momentum! (It’s also the best way to confirm the current size, lot, and occupancy rules for your property, since those are being updated.)
Step #3: Design It & Build It!
Approval in hand and budget set? Now comes the exciting part. If you love managing trades and vendors yourself, go for it! And if you’d rather have a friendly guide by your side, we offer a variety of design services and would love to help you bring your ADU or ohana to life.
Ready to create an accessory dwelling unit that makes you smile every time you see it? Let’s talk! We can’t wait to hear your dream.
With aloha,
Katen 🌺
Frequently Asked Questions About ADUs & Ohana Units in Hawaii
What is the difference between an ADU and an ohana unit?
The simplest difference is the kitchen. An ADU has a full kitchen and can be rented to long-term tenants, while an ohana unit is intended for family and typically has a wet bar instead of a full kitchen. Both add living space to your O’ahu property — the right choice depends on whether you’re housing family or planning to rent.
Can I rent out my ADU in Hawaii?
Yes — ADUs are allowed for long-term rentals (generally leases of six months or more). They cannot be used as short-term vacation rentals or bed-and-breakfasts. Because the City is currently updating its rules, confirm the latest rental and owner-occupancy requirements through Honolulu’s pre-check process before you build.
How much does it cost to build an ADU on O’ahu?
Costs vary widely based on size, site conditions, and finishes, and older homes with single-wall construction can add complexity. The best first move is to set a budget and a funding plan early, then get pre-approved — that’s where a design partner can help you add value in the right places and save in others.
Do I need approval before building an ADU?
Yes. Start with the City & County of Honolulu’s ADU pre-check form to confirm your property qualifies, then move through the permitting process. We’re happy to help you navigate it from idea to finished space.