ADU Impact Fees: Madison vs Middleton
How do adu impact fees rules compare between Madison, WI and Middleton, WI?
Madison, WI
Dane County
Madison does not charge development impact fees on residential ADUs. Wisconsin Statute 66.0617 authorizes municipal impact fees broadly but requires a fee study demonstrating new capacity need. Madison currently imposes only standard building permit fees through the Building Inspection Division. Madison Water Utility charges connection fees only if a new service line is installed.
View full Madison rules →Middleton, WI
Dane County
No data available yet for Middleton.
Key Facts Comparison
| Fact | Madison | Middleton |
|---|---|---|
| Municipal Impact Fees | None on ADUs | - |
| State Authority | Wis. Stat. 66.0617 | - |
| Building Permit | ~1-1.5% of construction | - |
| Utility Connection | Only if new service line | - |
Highlighted rows indicate differences between cities.
Madison FAQ
Does Madison charge impact fees for ADUs?
No. Madison does not impose development impact fees on residential ADUs. Standard permit fees apply through Building Inspection plus trade permit fees and any utility connection fees from Madison Water Utility if a new service is required. Parks impact fees under MGO 16.23 apply only to new subdivision lots, not infill ADUs.
How much does it cost to permit an ADU in Madison?
Total municipal fees typically range from $1,500 to $4,000. Building permit fees scale at roughly 1 to 1.5 percent of construction value. Trade permits add several hundred dollars each. Utility connection fees only apply if a new water service or sewer connection is installed.
Middleton FAQ
No FAQs available.
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