Cost to build accessory dwelling unit — Green Bay, WI
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
When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.
Frequently asked in Green Bay
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What is the process for accessory dwelling unit construction?
What are the local ADU options available?
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What is a detached accessory dwelling unit?
Also serving nearby: Milwaukee · Madison · Kenosha · Waukegan · Grand Rapids
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Green Bay — population 105,744; about 2,325 residents per square mile across 45.5 sq mi. ZIP codes covered include 54301, 54302, 54303, 54304, 54305, 54306, 54307, 54308.
Neighborhoods served in Green Bay: Ashwaubenon, De Pere, Allouez, Howard, Suamico — and every surrounding area.
Areas we serve
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