Accessory dwelling unit — 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 ADU is a self-contained living space that includes a kitchen, bathroom, and sleeping area, situated on the same lot as your primary home. You need one if you require more space but want to avoid moving. Costs fluctuate based on material choices, utility upgrades, and square footage. Exact pricing confirmed free on the call.
Frequently asked in Madison
What accessory dwelling unit companies serve Madison?
What is the process for accessory dwelling unit construction in Madison?
What are the best accessory dwelling unit designs for Madison?
What are the financing options for an accessory dwelling unit in Madison?
What is an ADU company in Madison?
What is the permit process for an accessory dwelling unit in Madison?
What are the costs of an accessory dwelling unit 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, Maple Bluff, Regent's Park, Old University Heights, Nakoma — and every surrounding area.
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