Honolulu County, HI Cap Rates by Neighborhood

County-Wide Gross Yield: Why 4.25% Is the Wrong Number to Underwrite

Zillow's county-wide data produces a gross yield of 4.25% against a median home price of $858,250 and a median rent of $3,038 per month. That headline number blends single-family homes priced above $1.1 million, working-class condos in Kalihi, and luxury towers in Kakaako into a single average that describes no individual deal accurately.

The full-year 2025 Oahu single-family median closed at $1,139,000. Run $3,038 against that price and gross yield compresses to 3.2%. Conversely, a 500-square-foot ADU renting at $1,600 per month on a parcel acquired well below median produces a very different number on the incremental capital. The spread between segments is where the real underwriting lives.

Net Cap Rate: What Survives After Tax and Compliance Costs

Before examining neighborhood variations, two line items reduce gross yield on every deal in Honolulu County regardless of location.

Property tax. Investment residential properties assessed below $1 million carry a tax rate of $3.50 per $1,000 of assessed value (0.35%). On a $858,250 acquisition, that is $3,004 per year, or about $250 per month. At $1,139,000, the annual bill is $3,987. These figures are exceptionally low relative to mainland markets and preserve more of the gross yield than most investors expect from a high-cost coastal market.

General Excise Tax on gross rents. Hawaii's 4.5% GET applies to all gross rental income with no deduction for vacancies, repairs, or operating expenses. On $3,038 per month in gross rent, that is $137 per month or $1,641 annually, a direct yield haircut. On a $858,250 property grossing $36,456 per year, the GET alone reduces gross yield from 4.25% to about 4.06% before any other operating cost. Landlords who pass GET to tenants contractually recover part of this, but the obligation remains a first-dollar cost that must be underwritten at acquisition.

Combined, property tax and GET consume roughly $4,645 per year on a median-priced property generating median rent. That translates to a reduction of about 54 basis points from the 4.25% gross figure. A clean two-expense net yield before maintenance, insurance, vacancy, or management sits around 3.7% on median assumptions.

Short-term rental operators face a compounding penalty. Transient Vacation Rentals are taxed at $9.00 to $11.50 per $1,000 of assessed value, 2.6 to 3.3 times the residential rate, plus a 13.25% combined Transient Accommodations Tax on top of the 4.5% GET. The numbers do not work unless you hold a scarce nonconforming TVR permit and achieve occupancy rates well above market average.

Neighborhood and Segment Breakdown

Kakaako: Compressed Yields, Terminal Value Bet

Kakaako is urban Honolulu's densest new-construction pipeline. Victoria Place, Ulana, Launiu, Alia, Kalae, and the proposed 1588 Ala Moana mixed-use project (condos, 291-room hotel, 26,000 sq ft commercial) are all in various stages of delivery or entitlement. New-construction condo prices in this submarket carry a premium to the $858,250 county median, which compresses gross yields further below the 4.25% baseline.

The investment case here is not current income. The 2031 Civic Center Skyline station terminus positions Kakaako as the downtown end of the rail corridor, and the city's $51.5 million Iwilei Center acquisition signals continued public investment in adjacent parcels. Buyers accepting a sub-3.5% gross yield are explicitly paying for terminal value and TOD-driven appreciation, not near-term cash flow. Resale competition from ongoing new-construction deliveries is the primary near-term risk that can prevent that terminal value from materializing on schedule.

Kalihi: Most Actionable Yield Plus Appreciation Optionality

Kalihi is the single neighborhood in the brief where current-income yield and forward appreciation optionality overlap most directly. As Honolulu's historically affordable working-class district adjacent to downtown, entry prices sit below the county median. The October 2025 Skyline Segment 2 opening placed an operating rail station at Dillingham Boulevard and Mokauea, and the city has already issued an RFQ for a Kalihi parcel targeting mixed-income TOD redevelopment.

A buyer acquiring a small multifamily or lot with ADU rights in Kalihi at a price below county median while collecting rents at or above the $3,038 county median produces a gross yield above 4.25%. After applying the 0.35% property tax and 4.5% GET haircuts, the net position is still more favorable than Kakaako. The city-backed TOD pipeline reduces the speculative burden on appreciation assumptions. This is the most actionable setup the brief supports.

ADU Additions: Incremental Yield on Existing Parcels

Honolulu's Ordinance 25-2 (effective September 30, 2025) expanded ADU rights to sub-3,500 square foot lots and allows a second ADU where an ohana unit or two principal dwellings already exist. Phase 1 compliance with Hawaii's Act 39 will require two ADUs per residential lot by December 31, 2026.

The incremental yield math on an ADU addition is distinct from a whole-property acquisition. Construction cost runs $150,000 to $300,000 depending on size and complexity. ADU rents in Honolulu average $1,600 to $3,000 per month. At $1,600 per month and $150,000 construction cost, the ADU gross yield on incremental capital is 12.8%. At $3,000 per month and $300,000 cost, it is 12.0%. After 4.5% GET and management costs, net yields on ADU additions are likely to range 9.0% to 10.5% on incremental capital, which is a different return profile than buying stabilized assets at county-median pricing.

The constraint is labor. Construction employment in Honolulu sits at about 16,400 jobs, 12% below its 2018 peak of 18,700. Jones Act import costs inflate every line item in a construction budget. Investors should underwrite conservative cost contingencies and verify contractor availability before committing to an ADU addition strategy.

Flood Risk Adjustment to Net Yield

FEMA's updated O'ahu flood maps became effective June 10, 2026. Over 8,000 properties moved into higher-risk Special Flood Hazard Areas (A or V zones), while fewer than 400 moved to lower-risk designations. Properties newly reclassified into A or V zones now carry mandatory NFIP flood insurance purchase requirements, adding a recurring cost to operating expenses.

Honolulu's participation in FEMA's Community Rating System since 2021 can provide partial NFIP premium discounts, and investors should confirm the applicable CRS discount class at closing. Properties in stream-adjacent or low-elevation locations in Kalihi, Iwilei, and coastal Kakaako are most likely to be affected. An updated flood elevation certificate is non-negotiable due diligence before closing any deal in those areas. A flood insurance premium running $2,000 to $5,000 annually on a property generating $36,456 in gross rents reduces effective gross yield by 55 to 137 basis points before any other expense.

Cap Rate Compression vs. Decompression

Honolulu's 2025 existing home price appreciation was flat (0.0% per the UHERO Repeat Sales Index). The county-wide ZHVI shows a modest 0.97% year-over-year gain as of mid-2026. Rents, measured by ZORI at $3,038, have not been provided with a year-over-year comparison in the brief, but the combination of flat prices and any positive rent movement constitutes mild cap rate expansion, or at minimum, stabilization.

The new condo inventory in Kakaako contributed to mild affordability gains in that segment, which means condo-specific gross yields have ticked up from their prior lows as prices plateaued and rents held. For single-family homes with a 2025 median of $1,139,000, the yield at $3,038 monthly rent is 3.2% gross, which is thin. Price decompression in single-family has not occurred; buyers in that segment are paying a structural scarcity premium with limited current-income support.

Cap Rate Outlook

Three factors will determine whether yields compress or expand from here over the 24 to 36 month horizon.

Supply additions from Bill 6 and ADU reform. Bill 6's reduction of minimum lot sizes to 5,000 square feet and higher allowable FARs will over time increase rental competition in established apartment zones. This is a yield-decompressing force on gross rents. The pace of delivery is constrained by the same labor shortage that keeps construction employment 12% below peak, so the supply response will be slower than zoning reform alone implies.

Skyline Segment 3 execution. The $1.66 billion Tutor Perini City Center Guideway contract targets major construction completion in 2030 with passenger service in March 2031. Station-adjacent parcels in Kalihi and Iwilei will price in TOD premium ahead of station opening, compressing cap rates in those corridors as the project advances. Chronic cost overrun history (from a $2.5 billion 2006 estimate to $10.16 billion today) means delay risk is real, and investors underwriting 2031 station-opening premiums in 2025 or 2026 price levels should apply a discount for that risk.

Employment trajectory. Honolulu County total covered employment declined 0.7% year-over-year in December 2025. Healthcare anchors from Queen's Health Systems, Hawaii Pacific Health, and Kaiser Permanente employ over 16,000 statewide and are expanding, providing a non-cyclical employment floor. Tourism headcount fell 2.9% in October 2025 despite higher per-visitor spending, which complicates Waikiki-adjacent short-term rental economics but does not directly pressure long-term residential rents.

The base case is a market where gross yields stay in the 3.2% to 4.5% range by segment, flood insurance and GET continue to compress net yields by 100 to 200 basis points, and the return thesis for most buyers rests on long-term structural appreciation from a 27,710-unit supply deficit that cannot be closed within the decade. ADU additions and Kalihi TOD-adjacent acquisitions offer the best near-term yield profiles the brief supports.

Model your specific deal with our investment property calculator to stress-test GET, flood insurance, and ADU return scenarios against your actual acquisition price and projected rent.