Warrior Construction (license #BC-34373) builds ADUs and ohana units across O'ahu, including detached cottages, garage conversions, and attached units. Costs range from $150K–$600K+. They manage design, permitting, and construction end-to-end.read more
From Ohanas (ADU) to luxury custom houses, we pride ourselves in offering uncompromising results and unquestionable ethics.
read more
In the heart of Honolulu, a quiet change in residential architecture is happening with Accessory Dwelling Units (ADUs). These well-designed living spaces are more than just extra square footage—they represent the spirit of ‘ohana and provide a... read more
At R. Clary Builders, we know that ADUs can be a necessary home modification process, and are available to provide you with all necessary support during the construction process. Even if you do not have a pressing need for a home extension, Kailua... read more
Tall Builders is Oahu's trusted home addition contractor with 20+ years of experience. Services include ADUs, garage conversions, second story additions, lanai extensions & sunrooms. Licensed, insured & ROH-compliant.
read more
All Phase Construction LLC is a Honolulu-based contractor serving Oahu, Maui, Big Island & Kauai since 2013. Specializing in ADU construction, custom homes, additions & concrete work across Hawaii.
read more
UCG Hawaii offers home additions across Oahu, Maui, Big Island & Kauai. Services include ADUs, granny flats & in-law suites. They handle permits, design & site challenges, with a free consultation to start.
read more
Ali'i Builders specializes in custom home construction, renovations, and additions in Hawaii. Services include single-family homes, ADUs, granny flats, and multi-generational living spaces. Notable projects include luxury residences at Kūkiʻo Go... read more
Accessory Dwelling Units (ADUs) are a fantastic way to maximize your property’s potential. Whether you’re looking to create a guest house, rental unit, or additional living space for family members, our ADU construction services provide a vers... read more
Small Cottages Hawaii, a division of Canaan Builders LLC founded in 1978, specializes in permitted ADU construction across Oahu. Offering custom and pre-designed backyard cottages compliant with Honolulu's 2015 ADU Ordinance, they provide quality ... read more
Maui Eco Built offers prefab & custom ADUs, granny flats, and homes on Maui. Panelized construction cuts build time. Structures range from permit-exempt under 200 sq ft to 3,000 sq ft homes. Design, permits & site planning available.
read more
Ward Design Center is a design-build firm specializing in ADUs, garage conversions, granny flats, JADUs, and in-law suites. They guide homeowners through planning, design, permitting, and construction for functional, custom living spaces.
read more
Coulson Hawaii offers full-service ADU construction on Oahu, managing design, permits & build. Specializing in second-story additions, in-law suites & wheelchair-accessible granny flats to help Hawaii families maximize their property.
read more
Honua Builders is a Kihei, Maui-based construction firm offering luxury custom homes, remodels, additions, and ADU construction across Hawai'i. Led by two licensed B General Contractors, they deliver hands-on, high-quality residential and commerci... read more
Homeowners Design Center in Honolulu, Hawaii, offers ADU design, kitchen & bathroom remodeling, and interior finish products. Family-owned with 40+ years of experience, they serve residential and commercial clients with custom, quality-driven ... read more
Hawaii is one of the most expensive housing markets in the entire United States, with median home prices consistently ranking among the highest in the nation. The state's geographic isolation, limited land availability, and high cost of living make Accessory Dwelling Units (ADUs) an increasingly popular solution for homeowners looking to maximize their property's value or generate rental income. In response to the housing crisis, Hawaii has actively worked to streamline ADU regulations, making it easier than ever to work with qualified ADU contractors in Hawaii to build these secondary units.
Each county in Hawaii — Honolulu, Maui, Hawaii County, and Kauai — has its own set of zoning rules and permitting requirements for ADUs. In Honolulu, for example, the city allows ADUs on lots zoned for single-family residential use, provided the lot meets minimum size requirements. State law under Hawaii Revised Statutes (HRS) Chapter 46 has pushed counties to ease restrictions and encourage ADU development. Key regulations that experienced ADU contractors must navigate include:
Working with a licensed ADU contractor in Hawaii is essential due to the complexity of local permitting processes. Contractors must be licensed through the Hawaii Department of Commerce and Consumer Affairs (DCCA), specifically under the Contractors License Board. Homeowners should always verify that their contractor holds a valid General Engineering or General Building contractor license before beginning any project. Experienced local contractors will also be familiar with Hawaii-specific construction challenges, including:
Despite the challenges, investing in an ADU in Hawaii offers significant financial rewards. With the tourism industry driving strong demand for short-term rentals and a persistent housing shortage affecting long-term rental markets, a well-built ADU can generate substantial monthly income. ADU contractors in Hawaii with local expertise can help homeowners design units that comply with county regulations while maximizing livable space and energy efficiency. Features like solar panel integration, rainwater catchment systems, and natural ventilation design are commonly incorporated to reduce utility costs and align with Hawaii's sustainability goals.
When searching for the best ADU builder in Hawaii, prioritize contractors with proven experience in your specific county, a strong portfolio of completed ADU projects, and positive client reviews. Request detailed bids, verify licensing through the DCCA, and ensure your contractor pulls all necessary permits. A knowledgeable local contractor will guide you through every step — from initial design and permitting to final inspection — ensuring your ADU project is completed on time, within budget, and fully compliant with Hawaii's unique building requirements.