ADU Hawaii
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Nonprofit educational resource, not a builder — connects Oahu homeowners with vetted ADU professionals and provides regulatory guidance.
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About ADU Hawaii
ADU Hawaii is a Honolulu-based resource and educational organization focused on accessory dwelling units on Oahu, operated by the Hawaii Appleseed Center for Law and Economic Justice. Rather than functioning as a construction firm, the organization provides homeowners with comprehensive guidance on ADU regulations, zoning requirements, and financing options under Hawaii state law. The organization publishes the ADU Homeowners Handbook, a downloadable guide walking single-family homeowners through the full ADU development process on Oahu. They also maintain a network of vetted construction professionals, designers, and permitting specialists that homeowners can connect with for their specific projects. ADU Hawaii serves as a critical education and navigation layer in a state where housing costs are among the highest in the nation. Their work supports both homeowners seeking rental income and families looking to house multiple generations on a single lot. Hawaii ADU lots must be at least 3,000 sq ft, with units ranging from 400 sq ft on smaller lots to 800 sq ft on lots over 5,000 sq ft. Note: ADU Hawaii is a nonprofit resource organization, not a general contractor or design-build firm. Homeowners seeking actual construction should use their vetted professional network.
Service Menu
| Service | Price |
|---|---|
| Custom Adu | Call for pricing |