Can I Build Second Story Addition in Madison, WI? (2026)
Find out if you can build a second story addition in Madison, WI. Rules, permit requirements, costs, and next steps.
Adding a second story in Madison, WI is possible in most zones, subject to height limits and structural permit requirements.
A second story addition is one of the most complex home improvement projects in Madison, WI. It requires a full building permit, structural engineering review, and must comply with the height limits for your zoning district. Unlike a ground-floor addition, a second story changes the roofline and structural load path of your entire home, triggering stricter engineering requirements. In Madison, zone height limits range from 30 feet in TR-C2 zones — verify your zone before planning.
Second Story Addition Rules in Madison
Second Story Addition Rules in Madison: Building permit required: Yes — all second story additions require a permit. Permit thresholds: All structural additions. Example height limit (TR-C2): 30 feet, max 2 stories. Structural engineering drawings required. Setbacks apply to the full structure height. Madison Building Inspection. Madison's isthmus geography creates unique lot shapes — many addition projects require careful attention to setbacks given irregular lots near the lakes.
Costs & Fees
Second story addition permit fees in Madison: Based on construction value — typically $700-$4,000. Note: structural engineering fees ($2,000–$10,000+) are separate from permit fees.
Timeline
Plan check: 3-6 weeks. Construction typically 3-6 months for a full second story.
Next Steps
Next steps for adding a second story in Madison: 1. Hire a structural engineer to assess your existing foundation and framing capacity. 2. Confirm your zone height limit and verify the addition meets all setback requirements. 3. Submit full structural plans and permit application to the Madison Building Inspection Division. 4. Inspections required at foundation reinforcement, framing, shear panels, and final.
Madison Building Inspection Division
Phone: (608) 266-4551
Website: https://www.cityofmadison.com/building-inspection
Online Permits: https://www.cityofmadison.com/building-inspection/permits
Frequently Asked Questions
Can I build an ADU near the UW-Madison campus?
Yes — and Madison makes it particularly easy in urban transect zones (TR-U1, TR-U2) near campus. In these zones, ADU approval is by-right (no discretionary review), no additional parking is required, and setbacks are minimal. Detached ADUs up to 1,000 sqft are permitted. Madison's ADU program is among the most progressive in the Midwest, designed in part to address the intense student rental housing demand around the University of Wisconsin campus.
What is Madison's transect zoning system?
Madison replaced traditional Euclidean zoning with a form-based transect code in 2013 under Chapter 28. The transect ranges from TR-C1 (countryside, lowest density) to TR-U2 (urban core, highest density). Each zone reflects an urban-to-rural intensity gradient — the higher the zone designation, the more urban the character and the more flexibility for mixed uses, reduced parking, and denser development. You can find your property's transect zone on the Madison zoning map at cityofmadison.com/dpced/planning/zoning.
Does Madison require parking for ADUs?
No — in Madison's urban transect zones (TR-U1 and TR-U2), no additional parking is required for an ADU. This is one of the most progressive ADU parking policies in the Midwest. In suburban transect zones (TR-C3, TR-C4), one parking space may be required. Madison has actively reduced parking requirements city-wide to encourage density and transit use.
What are the Dane County Farmers Market and cottage food rules in Madison?
The Dane County Farmers Market on Capitol Square is one of the nation's largest producers-only markets — vendors must grow or produce what they sell. Wisconsin Cottage Food Law (WI Stat. 97.29) allows home-based food production up to $20,000 annual revenue without a permit. In-person sales only — Wisconsin does not allow online cottage food sales. No state permit required. Madison does not add a local cottage food permit requirement. Permitted products include baked goods, jams, jellies, candy, and similar non-hazardous items.
My property is near Lake Mendota — are there extra restrictions?
Yes. Properties within 300 feet of Lake Mendota and other navigable waterways in Madison are subject to the Wisconsin DNR Shoreland Overlay regulations. These rules impose: minimum 75 ft shoreline setback for structures, impervious surface limits (typically 15-30% of the shoreland area), and vegetation preservation requirements within 35 ft of the ordinary high-water mark. These restrictions apply in addition to city zoning rules. Contact Madison Planning at (608) 266-4635 for a shoreland consultation before starting any project near the lakes.
Source: Madison Building Inspection Division — Building Regulations. Last verified April 6, 2026. View source