Marathon County, WI Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Marathon County, WI, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Max size, U-R district
- 1,400 sq ft
- Max size, L-D-R/R-R
- 2,000 sq ft
- Setback from house
- 15 feet
- Side/rear setback (residential)
- 7 feet
Summary
Detached sheds and garages in Marathon County's Urban Residential district top out at 1,400 square feet, need a 15-foot gap from the house, and must sit at least 7 feet off side and rear lines.
Table 6: DETACHED ACCESSORY BUILDING STANDARDS. Setback Requirements from principal structure 15 feet... from side property line 7 feet [U-R, L-D-R, R-R, R-E, G-A/F-P]... Maximum Size 1,400 sq.ft. [U-R], 2,000 sq.ft. [L-D-R and RR], NONE [R-E, G-A/F-P]. Maximum Height 24 feet [U-R, L-D-R], 35 feet [R-E, G-A/F-P].
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 59).
Full Breakdown
Table 6 of the county zoning code sets detached accessory building standards by district: in the Urban Residential (U-R) district, buildings are capped at 1,400 square feet and 24 feet tall with a 16-foot maximum side-wall height; in Low-Density Residential and Rural Residential districts the cap rises to 2,000 square feet at 24 feet tall. Every district requires a 15-foot setback from the principal house, 7 feet from side and rear lot lines in residential districts (or the district's standard minimum setback elsewhere), and sheds can sit in the front, side, or rear yard. Rural Estate and Agricultural districts have no size cap. This table governs only towns that adopted county zoning; it doesn't apply inside Wausau, Mosinee, Rothschild, or the other incorporated municipalities.
Violations & Fines
Building or placing an accessory structure that violates Table 6's size, height, or setback standards is a zoning violation; enforcement carries a forfeiture under Chapter 25.04 plus prosecution costs, with each day a separate offense (§ 17.807).
Frequently Asked Questions
How big a shed can I build in Marathon County's Urban Residential district?
How far must a shed sit from my house?
Sources & Official References
Other rules in Marathon County
How Marathon County compares: Shed Permit Requirements by City·Compare Marathon County to another location·View the Wisconsin accessory structures overview
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