Milton, WI Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- SR-7 max impervious ratio
- 75 percent
- SR-7 min green space
- 25 percent
- SR-7 max building coverage
- None (no separate cap)
- AO/IOC/EX/Airport impervious cap
- 80 percent
- First-offense forfeiture
- $50 to $500
- Enforcing official
- Zoning administrator
Summary
The City of Milton, Wisconsin does not cap building footprint directly. Instead it limits total impervious surface, driveways, patios and buildings combined, to 75 percent of the lot in the SR-7 single-family district and up to 80 percent in the Adult-Oriented, Intensive Outdoor Commercial, Extraction and Airport districts.
Sec. 78-02.11. - (SR-7) Single Family Residential-7 Zoning District. ... Principal Structure and Lot Requirements
Minimum Lot Area 6,000 square feet Maximum Impervious Surface Ratio 75 percent Minimum Green Space 25 percent Maximum Building Coverage None
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 21 Update 2).
Full Breakdown
Milton's zoning code, Chapter 78, sets dimensional standards for every district in a bulk-standards table under each district's own section. For the (SR-7) Single Family Residential-7 District, Sec. 11(7) lists "Maximum Building Coverage" as "None", meaning there is no separate cap on building footprint alone. Instead the operative limit is the "Maximum Impervious Surface Ratio" of 75 percent, paired with a "Minimum Green Space" requirement of 25 percent, so three-quarters of a residential lot in the City of Milton can be covered by structures, driveways and other hard surfaces combined.
The same 75 percent impervious ceiling and 25 percent green-space floor also apply to the (SR-10), (MH-7) mobile home, and (RH-35) rural holding districts. Nonresidential districts allow more coverage: the (AO) Adult-Oriented Entertainment, (IOC) Intensive Outdoor Commercial, (EX) Extraction/Disposal, and (AR) Airport districts each carry an 80 percent maximum impervious ratio with a 20 percent minimum green space. A property owner planning an addition, patio, or new driveway must keep the lot's total impervious coverage under the ratio for its zoning district; site plan review under Sec.
42 applies to many new development projects. Enforcement runs through the zoning administrator under Sec. 60, who investigates complaints, issues a written demand to halt or remedy a violation, and refers unresolved cases to the city attorney for prosecution or a court injunction.
Violations & Fines
Exceeding the impervious ratio for a zoning district is a violation of Chapter 78, enforced by the zoning administrator under Sec. 78-10.60. Forfeitures follow the general penalty in Sec. 1-14: not less than $50.00 nor more than $500.00 for a first offense, plus costs of prosecution, with jail up to 90 days if unpaid; a second offense within the same provision runs $100.00 to $1,000.00, jail up to six months if unpaid.
Frequently Asked Questions
Does the City of Milton limit how much of my lot I can build on?
Is the impervious limit the same in every Milton zoning district?
Who enforces the impervious surface limit in Milton?
Sources & Official References
Other rules in Milton
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