Middleton, WI Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- SR-L max coverage
- 45 percent of lot area
- SR-M max coverage
- 55 percent of lot area
- MR-L max coverage
- 70 percent of lot area
- AGR/UTR max coverage
- 25 percent of lot area
- Enforcing agency
- City of Middleton Zoning Administrator
- First-offense forfeiture
- up to $3,500 plus costs
Summary
The City of Middleton limits impervious surface, the combined footprint of buildings, driveways, patios and pavement, to 45 percent of any lot in the SR-L Single-Family Residential Low Density zoning district under City of Middleton Municipal Code § 10.02.10(7). The cap rises in denser districts: the SR-M district allows 55 percent and the MR-L multi-family district allows 70 percent. The Zoning Administrator checks the ratio at building-permit review.
(7)Density, Intensity, and Bulk Regulations for the (SR-L) Single-Family Residential — Low Density District ... Maximum Impervious Surface Ratio 45 percent
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 3 Update 1).
Full Breakdown
Middleton's Chapter 10 zoning ordinance sets a Maximum Impervious Surface Ratio for every zoning district in its Density, Intensity, and Bulk Regulations table, and the figure changes by district rather than applying citywide. 10(7). 22(7)). The Agricultural (AGR) district and the Utility, Transportation, Right-of-Way (UTR) district hold the ratio to 25 percent. 23, 'Impervious Surface or Area' covers structures, building extensions, patios, decks, porches, driveways, loading docks, parking lots and sidewalks, and 'Impervious Surface Ratio' is the total of all impervious surfaces on a site divided by the gross site area.
41 checks bulk standards, including impervious ratio, against the district table before a permit issues. Because the standard is a percentage of lot area rather than a flat square-footage number, larger lots in the same district can build more hardscape in absolute terms, but the ratio itself does not vary by lot size within a district.
Violations & Fines
Building or expanding impervious surface beyond a district's ratio without a permit violates § 10.10.60, which the Zoning Administrator enforces through inspection, a written notice of violation, and referral to the City Attorney for prosecution if the condition is not corrected. Under § 30.04(1)(a), a first offense carries a forfeiture up to $3,500 plus costs, and a repeat violation of the same provision carries a $50 to $3,500 forfeiture; each day a violation continues counts as a separate offense under § 30.04(2).
Frequently Asked Questions
What counts as impervious surface under Middleton's zoning code?
How much lot coverage is allowed on a typical Middleton house lot?
What happens if a project exceeds the impervious surface ratio?
Sources & Official References
Other rules in Middleton
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Lot Coverage Limits in Nearby Cities
How other cities in Dane County handle lot coverage limits.