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.
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HPM Hawaii offers ADU models statewide, from 416 to 1,672 sq. ft., with pre-approved options for Hawaiʻi Island. They guide homeowners through design, permitting, and construction while navigating each county's unique ADU regulations.
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Fabmac Homes builds custom manufactured homes on Maui with 20+ years experience. Factory-built at Clayton Homes, shipped to Maui in 6–8 months. Features include hurricane-rated construction, energy efficiency, and permanent foundations. Ideal for ADUs, granny flats, or in-law suites.
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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.
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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 versatile and comprehensive solution tailored to your needs.
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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 accessory dwelling units can have several advantages.
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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 practical solution to Hawaii’s housing problems.
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General Contractors Oahu offers home additions & ADU construction across Oahu, Hawaii. Services include bedroom, bathroom, second-story additions & granny flats. Licensed, insured & bonded with a 1-year labor warranty. Free estimates available.
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Hilweh Builders LLC is an Oahu, Hawaii general contractor specializing in ADUs, home additions, and design-build remodeling. Led by Chad Hilweh, they offer integrated architect collaboration, on-budget project management, and Hawaii-specific residential construction expertise.
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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.
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Affordable Portable Housing Hawaii is a design-build company specializing in shipping container homes, offices, and structures. They offer drafting, permits, and full project development with financing options available.
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DJ's Construction, Inc. is a Honolulu-based ADU contractor serving Oahu since 2006. They offer full-service accessory dwelling unit construction, including design, permits, and finishing. Recognized among Honolulu's top ADU builders.
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We are H-1 Construction, one of the few local, family-owned, and operated home builders in Honolulu, Hawaii. We take pride in our work and the relationships we have fostered over the years.
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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 housing solutions adding property value.
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Elevate Builders Hawaii offers home building, renovation, and ADU construction services, including detached ADUs, garage conversions, and in-law suites. Every home includes a 1-Year Limited Warranty for added peace of mind.
read moreHawaii 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.