3 Best ADU Builders in Madison, Wisconsin
Verified ADU contractors and builders in Madison, WI
Showing 1–3 of 3 listings
Ace of Space™ alternative carpentry
Ace of Space™ alternative carpentry is a queer-owned company that guarantees you will be treated with respect and kindness. They offer safe, transparent, respectful, and fairly priced services.
Boundless Tiny Homes
We specialize in designing and building high-quality, custom ADUs that seamlessly blend with your property, using top-notch materials and craftsmanship. We design, permit, and build Accessory Dwelling Units for homeowners throughout Dane County. ADUs are not a side project — they are all we do.
TDS Design Build
TDS Design-Build brings a level of craftsmanship that ensures exceptional results. Explore our portfolio and reach out to discover how our team can bring your vision to life with attention to detail and an unwavering commitment to excellence.
Frequently Asked Questions — ADU Builders in Madison
How much does it cost to hire an ADU builder in Madison?
ADU construction costs in Madison, Wisconsin vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Madison to get accurate quotes for your specific project.
How long does it take to build an ADU in Madison?
In Madison, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Wisconsin local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in Madison?
Yes, a building permit is required for ADU construction in Madison, Wisconsin. Your ADU builder will typically handle the permit application as part of their service. Wisconsin has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in Madison?
Common ADU types in Madison include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Madison ADU builder can advise on what's allowed on your specific parcel.