Adu permit — Madison, WI
Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
Getting an ADU permit is the legal process of obtaining local government approval for your building project. You cannot legally construct or occupy an ADU without this documentation. You need this service before any construction begins to ensure your build meets building codes and safety regulations.
Frequently asked in Madison
Can I get an ADU unit for my property in Madison?
Where can I find a local ADU in Madison?
What are accessory dwelling unit grants in Madison?
What does the term 'accessory dwelling unit' mean for homeowners?
What is the best accessory dwelling unit for my home?
How much does accessory dwelling unit construction cost in Madison?
What are the services offered by ADU companies?
Also serving nearby: Rockford · Milwaukee · Kenosha · Elgin · Waukegan
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Madison — population 280,305; about 3,373 residents per square mile across 83.1 sq mi. ZIP codes covered include 53701, 53702, 53703, 53704, 53705, 53706, 53707, 53708.
Neighborhoods served in Madison: The Isthmus, Nakoma, Shorewood Hills, Maple Bluff, Wingra Park, Regent — and every surrounding area.
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