ADU Contractor in Honolulu, Hawaii
Verified adu contractor businesses in Honolulu, HI
Showing 1–3 of 3 listings
Koolau Builders
We specialize in designing and building accessory dwelling units throughout Honolulu, helping homeowners add rental income or guest accommodates to their properties with expert construction and permitting support. From concept through completion, our team handles every aspect of ADU development tailored to your home and budget.
Rudenko Construction - Home Remodel
Honolulu's trusted specialist in ADU construction, delivering expert planning and build services to help homeowners maximize their property's potential with compliant, quality accessory dwelling units.
S. Tanaka Construction, LLC
Specializing in accessory dwelling unit construction throughout Honolulu, this contractor helps homeowners add functional living spaces to their properties with expert design and quality craftsmanship. From initial planning through final completion, they deliver ADU solutions tailored to Hawaii's unique building requirements and your family's needs.
Frequently Asked Questions — ADU Builders in Honolulu
How much does it cost to hire an ADU builder in Honolulu?
ADU construction costs in Honolulu, Hawaii vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Honolulu to get accurate quotes for your specific project.
How long does it take to build an ADU in Honolulu?
In Honolulu, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Hawaii local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in Honolulu?
Yes, a building permit is required for ADU construction in Honolulu, Hawaii. Your ADU builder will typically handle the permit application as part of their service. Hawaii has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in Honolulu?
Common ADU types in Honolulu include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Honolulu ADU builder can advise on what's allowed on your specific parcel.