Rock County, WI Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- County general coverage rule
- None countywide
- Who sets lot coverage
- Your city, village, or town
- Shoreland impervious cap
- ~15% (up to 30% w/ mitigation)
- Vegetative buffer
- 35 ft from high-water mark
- Shoreland applies within
- 1,000 ft lake / 300 ft stream
Summary
Maximum lot coverage and impervious-surface limits for general zoning are set by your city, village, or unincorporated town. Rock County directly limits impervious surface only within its shoreland districts, where NR 115 caps hard-surface coverage near navigable water.
The county shall require establishment and maintenance of a vegetative buffer zone within 35 feet inland as a vegetative buffer zone and prohibit removal of vegetation in the vegetative buffer zone except as follows: a. The county may allow routine maintenance of vegetation.
Full Breakdown
General lot-coverage ratios (building footprint or total impervious area as a share of the lot) are municipal or town zoning standards, not county. Rock County's binding coverage authority is shoreland zoning under NR 115: impervious surfaces within the shoreland zone are limited (commonly to 15 percent of the lot within 300 feet of the water, with mitigation allowed up to 30 percent), and a 35-foot vegetative buffer landward of the ordinary high-water mark must generally be preserved. These limits apply within 1,000 feet of a lake or 300 feet of a stream. Outside shoreland and floodplain areas, ask your local zoning administrator for the lot-coverage maximum.
Violations & Fines
Municipal zoning enforces general coverage limits. Exceeding shoreland impervious-surface caps or disturbing the buffer draws county enforcement, mitigation orders, and forfeitures.
Frequently Asked Questions
Is there a lot-coverage limit in Rock County?
What is the shoreland buffer requirement?
Sources & Official References
Other rules in Rock County
Compare Rock County to another location·View the Wisconsin building setbacks & zoning overview
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