Looking for accessory dwelling unit companies in Madison, WI? Call AccessoryDwellingUnit Solutions for a contact a provider — no obligation. Licensed adu builders serve Madison and the surrounding area, and you'll get straight answers on timing and what affects the price.

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

ADU companies offer end-to-end solutions, often handling everything from the first sketch to the final walk-through. You need these companies if you prefer a streamlined experience where one firm takes responsibility for design, permitting, and construction. They are ideal for homeowners who want to minimize the stress of managing multiple vendors and prefer a turnkey approach to adding a secondary residence to their property.

Frequently asked in Madison

What are the disadvantages of ADUs in Madison?

How much does an ADU cost in Wisconsin?

What are the rules for ADUs in Madison?

Madison has specific regulations for accessory dwelling units, covering aspects like minimum lot size, setbacks from property lines, and density limits. Understanding these rules is vital for a successful project. The pros you'll speak with are knowledgeable about these ordinances.

Is an ADU allowed in Madison?

What is the process for building an ADU in Madison?

Can I add an ADU for rental income in Madison?

Adding an ADU for rental income is a popular option in Madison, offering a way to boost your property's earning potential. It's important to ensure your ADU complies with all city regulations for rental units. The pros can help you design an ADU that is both appealing to renters and meets local codes.

Also serving nearby: Rockford · Milwaukee · Kenosha · Elgin · Waukegan

All cities in Wisconsin →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

280,305residents

3,373per sq mile

8ZIP codes served

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: Near East Side, Capitol Square, Wingra Park, Fitchburg, Shorewood Hills — and every surrounding area.