Accessory dwelling unit companies — 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

ADU companies offer end-to-end solutions, often handling everything from the first sketch to the final walk-through. You need these companies if you prefer a streamlined experience where one firm takes responsibility for design, permitting, and construction. They are ideal for homeowners who want to minimize the stress of managing multiple vendors and prefer a turnkey approach to adding a secondary residence to their property.

Frequently asked in Urban Honolulu

Also serving nearby: San Francisco · Daly City · San Mateo · Salinas · Santa Maria

All cities in Hawaii →

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: Kaimuki, Kapahulu, Makiki, Moiliili, Palolo Valley, St. Louis Heights — and every surrounding area.