Accessory dwelling unit 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
An accessory dwelling unit permit is the required authorization from your local planning department to build on your lot. This paperwork confirms your plans follow zoning rules and structural safety standards. You need this service if you are in the planning stages of your backyard project.
Frequently asked in Madison
What is the cost of an accessory dwelling unit permit in Madison?
Where can I find accessory dwelling unit contractors in Madison?
What are ADU services available in Madison?
What are the requirements for accessory dwelling units (ADUs) in Madison?
Can I get an accessory dwelling unit near me in Madison?
What is the accessory dwelling unit construction cost in Madison?
What are the benefits of accessory dwelling units (ADUs) in Madison?
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: Shorewood Hills, Nakoma, Maple Bluff, The Isthmus, Allied Drive — and every surrounding area.
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