Cost of accessory dwelling unit — Urban Honolulu, HI
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.
About this service
The total price for an ADU depends on several moving parts, including the square footage, your foundation type, and local labor rates. Choosing high-end finishes or complex site prep will naturally increase the budget, while standard layouts help keep things manageable. Exact pricing confirmed free on the call.
Frequently asked in Urban Honolulu
What is the cost to build an Accessory Dwelling Unit in Urban Honolulu?
Can I get an ADU estimate for my property in Urban Honolulu?
Yes, you can get an ADU estimate for your property in Urban Honolulu. Simply call us to schedule a consultation. A qualified professional will assess your site and discuss your needs. They'll provide a clear, no-obligation quote. This allows you to budget effectively for your ADU project.
What are the rules for detached Accessory Dwelling Units in Honolulu?
Are there Accessory Dwelling Unit builders near me in Urban Honolulu?
What makes an ADU affordable in Honolulu?
What exactly is an ADU unit in Honolulu?
What does 'accessory dwelling unit' mean in Honolulu?
Also serving nearby: San Francisco · Daly City · San Mateo · Salinas · Santa Maria
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Urban Honolulu — population 341,778; about 5,637 residents per square mile across 60.6 sq mi.
Neighborhoods served in Urban Honolulu: Kapolei, Makakilo, Waipahu, Kaneohe, Ewa, Mililani — and every surrounding area.
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