Accessory dwelling unit permit cost — 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.
Frequently asked in Madison
What are 'homes with in-law suites' in Madison?
Are there specific ADU regulations in Massachusetts that apply to Madison?
Where can I find accessory dwelling unit builders near me in Madison?
Are there ADU grants available in New Hampshire that apply to Madison?
Can I get a 24-hour ADU service in Madison?
What is an ADU unit in Madison?
What's the ADU cost 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: Capitol Square, Midvale Heights, Tenney-Lapham, Near East Side, Shorewood Hills — and every surrounding area.
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