Oahu's 90-Day Rental Rule: The Fight Repricing Condos

The 90-day rule is already law - the open question is who it eventually reaches

Ask most O'ahu condo owners whether Honolulu's 90-day rental minimum is in effect and you will get a confident answer in both directions. The truth is more specific, and for anyone underwriting a condo it matters more than either headline.

Since late 2022, renting a residential unit outside resort zoning for less than 90 consecutive days has been illegal for anyone who was not already doing it. The only owners still lawfully renting in the 30-to-89-day window are those whose rentals were operating before the rule took effect, protected by a federal court judgment. In 2024 the state handed counties the power to phase out even those protected uses. Honolulu has not used it yet.

That is the whole story: a closed door for new entrants, a shrinking group of protected operators, and a phase-out power sitting unused on the shelf. The 30-to-89-day segment - traveling medical staff, seasonal residents, remote workers, military families in transition, locals displaced by renovations - is real income on O'ahu, but it now belongs to a fixed set of units. How long that set survives is the question the market is pricing.

How we got here

2022 - the 90-day rule. In April 2022, Bill 41 was signed as Ordinance 22-7, raising the minimum rental period outside resort-zoned areas from 30 to 90 consecutive days and tightening the registration and advertising rules the city adopted in 2019. The rule took effect October 23, 2022.

2022-2023 - the court carve-out. The Hawaii Legal Short-Term Rental Alliance sued, and in October 2022 federal Judge Derrick Watson blocked enforcement of the 90-day minimum against existing 30-to-89-day rentals. In December 2023 he made that protection permanent. His reasoning rested on Hawaii's zoning-enabling statute, HRS 46-4(a), which at the time barred counties from eliminating lawfully established uses. The judgment protected rentals operating before the ordinance took effect - not the 30-day market in general. Everyone else has been bound by the 90-day minimum since October 2022. The city paid roughly $292,500 of the alliance's legal fees.

2024 - the state changes the rules. In May 2024, Act 17 (SB 2919) amended HRS 46-4 to let counties regulate the "time, place, manner, and duration" of land uses and to amortize or phase out transient accommodation uses in any zoning district - the very protection Judge Watson relied on.

2025 - a recodification, not a second rule. You will see Ordinance 25-2 described as Honolulu's "second" 90-day law. It is not. Ordinance 25-2 (Bill 64, introduced in 2023 and signed January 3, 2025) is a sweeping reorganization of the city's Land Use Ordinance use rules. It carries the existing 90-day definitions and advertising rules forward into the new code structure. It did not re-enact them, add an amortization schedule, or touch the court-protected operators. It took effect September 30, 2025. Fines for short-term rental violations run up to $10,000, plus up to $10,000 for each day the violation continues.

Where things stand now

Three groups of units, three different realities:

• Resort-zoned and nonconforming-use (NUC) properties can rent for less than 30 days, per the DPP's short-term rental rules. Nothing in this fight touches them.
• Protected 30-to-89-day operators - rentals operating before October 23, 2022 - continue lawfully under the court judgment.
• Everyone else in residential zoning is limited to 90 consecutive days or more.

Enforcement is where perception and law diverge. The Department of Planning and Permitting has said it will "continue to enforce STRs as less than 30 consecutive days across the board," concentrating thin staff on true vacation rentals, which are more disruptive and easier to prove. That posture is why many owners believe the 30-day minimum still governs. It does not change the law: a non-protected unit rented for 45 days is out of compliance, and its owner is relying on enforcement priorities, not rights.

And advertising is where enforcement does bite, sometimes brutally. In 2026 an 83-year-old Honolulu owner faced nearly $600,000 in accumulated fines after a rental platform kept her listing up as a short-term rental. She sued in federal court, and the city settled in July by cutting the fine about 95 percent. The lesson for buyers is not the settlement - it is how fast daily fines compound against a unit marketed outside its legal use.

The real question: will Honolulu use the phase-out power?

Act 17 gave the city a tool it did not have in 2022. A county can now set an amortization period - a window to recoup investment - after which a protected transient use must stop. This is not hypothetical: in December 2025, Maui County enacted Bill 9, phasing out roughly 6,200 apartment-zoned vacation rentals by 2029 in West Maui and 2031 elsewhere. Honolulu has not proposed an amortization ordinance for its 30-to-89-day operators, and no court has ruled on whether a phase-out of established rentals would survive vested-rights, takings, or due-process challenges. Those constitutional arguments were never reached in the 2022 case, because the state-law claim was enough.

So the value of a protected 30-to-89-day unit is really a bet on two things: whether the city ever acts, and how long the amortization window would be if it does.

If Honolulu phases out protected operators

The monthly-rental segment outside resort zoning disappears on whatever schedule the ordinance sets. Units valued partly on that income - fringe Waikiki, Ala Moana-adjacent walk-ups, older towers marketed to seasonal tenants - revert to owner-occupant and long-term-rental economics. Expect longer marketing times and sharper discounting while the market absorbs it.

The mirror image is concentration. Resort-zoned and NUC inventory becomes the only flexible-term rental product on the island, and the legality premium in those buildings widens. Waikiki's resort-zoned buildings and Ko Olina's resort condos would hold what amounts to a regulatory monopoly on visitor and monthly rental income.

If the city leaves it alone - or loses in court

The status quo hardens into a two-tier market. Protected units carry a right that can no longer be created, and scarcity does the repricing: a unit with a documented, continuous pre-October-2022 rental history is worth more than an identical unit next door without one.

That premium carries two discounts. The first is durability: a protected use generally attaches to the property, but continuity matters - a unit that stopped renting, or changed to a different use, may have lost its protection, and the right is only as good as the paper trail behind it. The second is policy risk: Act 17 is on the books, and a phase-out ordinance could arrive in any budget or housing cycle. Sophisticated buyers will discount any income stream that rests on a court judgment the legislature has since undercut.

Either way, resort-zoned certainty wins. Ko Olina and Waikiki's resort-zoned buildings do not depend on the judgment. Their rights rest on zoning that no version of this fight touches. Kaka'ako and most non-resort urban towers sit at the other pole - their values ride on lifestyle and long-term demand, not visitor-rental rights. The inventory truly in play is the middle: buildings that feel rentable and are marketed on monthly-rental income, where a unit's protected status is the difference between an income property and a home.

What buyers and sellers should do

For buyers: buy documented legal status, not marketing language. Verify eligibility against the DPP short-term rental rules and eligibility map and confirm any registration or NUC number directly. If a listing's income depends on 30-to-89-day rentals, ask for proof the unit was renting before October 23, 2022 and has rented continuously since - leases, tax filings, booking records - and have your attorney review whether that history carries to you. Review the seller's Ordinance 22-6 disclosure of the property's legal income-producing potential. Read the AOAO declaration and house rules - zoning can permit what the building forbids. Underwrite on net income after HOA fees, insurance, management, GET and TAT, and price the unit as if a phase-out arrives. If the deal only works without one, the price should say so.

For sellers with a protected or resort-zoned unit: documentation is now value creation. Clean records, compliant advertising, and a paper trail a buyer's lender and attorney can follow are worth money. For sellers whose rental income does not rest on a protected use, the time to say so is before escrow, not during it.

My bottom line: on O'ahu, legality has become a condo amenity. The 90-day rule settled the question for new owners in 2022. What the market is pricing now is how long the exceptions last.

Sources: Ordinances 22-7, 22-6 and 25-2 (Bill 64, 2023) text, federal court records in Hawaii Legal Short-Term Rental Alliance v. City and County of Honolulu (2022 injunction, December 2023 judgment), Act 17 (2024, SB 2919) amending HRS 46-4, the Honolulu Board of REALTORS April 2025 STR briefing quoting DPP enforcement policy, Civil Beat reporting on fees and Maui Bill 9, and Pacific Legal Foundation on the 2026 Sandra May fine case.

Disclaimer: This article is provided for general informational purposes only and does not constitute legal, financial, or real estate advice. Market conditions change frequently; readers should conduct their own due diligence and consult qualified professionals before making decisions.