Tiny homes in Kailua, Hawaii — zoning rules, THOW parking, builder costs, and what you need to know before buying.
Last researched May 2026
Kailua is one of Oahu's most desirable beach communities — walkable town center, Lanikai and Kailua Beach, and home prices to match. Tiny-home activity here is almost entirely ohana/ADU construction for family housing or long-term rentals (short-term is prohibited). Coastal SMA and flood-zone overlays add engineering and permitting cost. Trade winds, year-round warmth, and salt-air corrosion drive material choices toward stainless hardware and fiber-cement siding.
Kailua (on the windward side of Oahu, not to be confused with Kailua-Kona) is governed by City and County of Honolulu zoning and permitted through the Department of Planning and Permitting. As of April 2026, Ordinance 25-2 (effective September 30, 2025) allows an Oahu single-family lot to host both an ADU and an ohana dwelling for up to three units total, and statewide Act 39 (HRS 46-4.8, 2024) requires Honolulu to permit at least two ADUs on residential lots by December 31, 2026, with the owner-occupancy requirement waived for the baseline and a 1,250 sq ft cap.
Kailua is largely R-5, R-7.5, and R-10, with additional special management area (SMA) and flood-zone overlays near the coast that add permitting steps. Honolulu has not adopted IRC Appendix Q, so foundation tiny homes follow the full 2018 IRC as a dwelling or ADU. ADU maximum size remains 400 sq ft on sub-5,000 sq ft lots and 800 sq ft on larger ones, with one off-street parking space required unless near Skyline — which does not yet serve Kailua. Short-term rental of an ADU is prohibited; six-month minimum lease.
Verify current requirements with your local planning department before purchasing land or beginning construction.
Verify current requirements with your local planning department.
Kailua ADUs follow Honolulu's standard rules: 400 sq ft on lots 3,500–4,999 sq ft, 800 sq ft on 5,000 sq ft+ lots, with a 3,500 sq ft minimum. Under Ordinance 25-2, a lot can carry both an ADU and an ohana dwelling (up to three total units). Coastal parcels may trigger SMA permits and flood-zone elevation requirements that add cost and review time. Owner-occupancy is required for standard permits.
Communities, RV parks, and parking options in and near Kailua.
Kailua follows statewide rules: a THOW is a registered RV with a 30-day parking limit outside licensed mobile home parks, and Kailua has none. Enforcement is active in this high-priced beach community. Coastal SMA overlays and flood zones further complicate any attempt to place a THOW or tiny structure near the shore. Parking/lot rental for a tiny home in Kailua runs $1,000–$1,500+/mo, near the top of Oahu's range.
Wailuku, Hawaii
Maui-based builder offering steel-frame SkyView models, shipping container conversions, and custom tiny homes. Serves all Hawaiian islands. Price range $50K to $145K.
Service areas: Hawaii
Wailuku, Hawaii
Maui-based builder of off-grid expandable modular trailers, with units expanding up to 20x40 feet. Over 50 units installed on Maui. Pricing starts from $45K, making them one of the most affordable options in Hawaii.
Service areas: Hawaii
Papaaloa, Hawaii
Hamakua Coast builder offering eight custom tiny home models starting from $70K. Emphasis on eco-friendly construction and off-grid readiness suited to rural Big Island living.
Service areas: Hawaii
Kahuku, Hawaii
North Shore Oahu builder specializing in shipping container conversions using 20-foot, 40-foot, and 45-foot containers. Eight years of experience building container homes for Hawaii's climate. Price range $79K to $122K.
Service areas: Hawaii
Captain Cook, Hawaii
Big Island-based custom tiny home builder offering turnkey THOWs optimized for Hawaii's climate and logistics. Price range from $100K to $500K depending on customization. Also operates a land network to help buyers find suitable placement sites on the Big Island.
Service areas: Hawaii
Honolulu, Hawaii
Honolulu-based builder of plantation-style tiny houses on wheels at approximately 110 square feet. Fully off-grid with solar power, rainwater catchment, and composting toilet systems. Priced around $50K.
Service areas: Hawaii
A comparison between tiny-home living and conventional homeownership in Kailua.
Tiny home path
Traditional home path
Potential monthly savings
Verified links for planning, permitting, and community connections in Kailua.
Potentially, but SMA (Special Management Area) review and flood-zone elevation rules usually apply within about 100 meters of shoreline. Expect additional permits, elevation requirements, and longer review timelines.
No. Honolulu requires a minimum six-month lease for ADUs. Kailua also has its own enforcement focus against unpermitted short-term rentals.
Under Ordinance 25-2, up to three total — main home, ADU, and ohana dwelling — subject to lot size, zoning, parking, and any SMA/flood overlays.
No. The statewide 30-day RV parking limit applies, no licensed RV parks exist in Kailua, and enforcement is active.
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