Modular 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
These units are built in a factory setting and then transported to your property for final assembly. This option is often chosen to reduce construction time and minimize disruption to your neighborhood. The final price is influenced by transport logistics, site preparation, and the level of customization. Exact pricing confirmed free on the call.
Frequently asked in Madison
What does 'accessory dwelling unit' mean in Madison?
In Madison, an accessory dwelling unit (ADU) refers to a secondary, independent housing unit on a single-family lot. It can be attached to the main house or be a detached structure. ADUs provide separate living quarters with their own kitchen, bathroom, and sleeping area. They are often used for rental income, housing family members, or as a home office. They add flexibility to existing properties.
What are the costs associated with building an ADU in Madison?
What are the best ADU services to look for in Madison?
Are there ADU grants available in Madison?
While specific ADU grant programs can change, it's advisable to check with the City of Madison or local housing authorities for any available incentives or financial assistance. Sometimes, programs exist to encourage the development of accessory dwelling units. We can provide information on potential costs that may be helpful for grant applications. Inquire with local resources for current opportunities.
What are the requirements for an ADU permit in Madison?
What is involved in ADU building?
What are the benefits of a backyard ADU in Madison?
A backyard accessory dwelling unit (ADU) in Madison offers significant benefits. It provides a separate living space, increasing privacy for both the main home and the ADU occupant. This makes it ideal for rental income or housing extended family. It can also be designed as a dedicated home office or guest suite. The backyard location often allows for flexible design options.
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: Regent's Park, Nakoma, Lake Monona, Shorewood Hills, Maple Bluff — and every surrounding area.
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