Barndominiums are widely accepted across most counties.
The Department of Safety and Professional Services administers the code. Residential covered by the Uniform Dwelling Code. Commercial covered by the Commercial Building Code.
Primary Code
WI Uniform Dwelling Code / WI Commercial Building Code
Code Version
2015 IBC-based with WI amendments
Adoption Level
Statewide
Statewide Enforcement
Yes
Municipalities enforce residential codes. State handles commercial plan review.
Residential
Required
Commercial
Required
Agricultural
Not Required
Size threshold: structures under 200 sq ft may be exempt.
Agricultural buildings on farms are exempt from the Uniform Dwelling Code. Must be used exclusively for agricultural purposes.
Accessory structures under 200 sq ft typically exempt.
Heavy snow loads, especially in northern Wisconsin. Lake-effect snow near Lake Superior and Lake Michigan. Low seismic risk.
Wind Load
90–115 mph
moderate zone
Snow Load
25–60 psf
Seismic
A
Category
Flood
FEMA Regulated
Energy Code
WI Energy Code
Version
2015 IECC-based
Energy code enforced statewide.
License Type
Dwelling Contractor Qualifier Certification
Wisconsin requires Dwelling Contractor certification for residential work.
Front
25–35 ft
Side
5–15 ft
Rear
15–25 ft
Varies by municipality and county zoning.
Frost depth 48 inches in northern WI. Basements are standard.
Popular statewide. Standard permitting.
Agricultural exemptions available. Dairy barns very common.
Growing popularity. Accepted in most rural areas.
Standard permits. Snow load design important.
Full commercial building code compliance.
HOAs present in Milwaukee and Madison suburbs. Rural areas generally unrestricted.
Flood zones along the Mississippi, Wisconsin, and other rivers.
Verify the information above directly from these official sources. Regulations change — always confirm with your local building department before starting construction.
Disclaimer: This guide is for informational purposes only and does not constitute legal or professional advice. Building codes, permit requirements, and zoning regulations change frequently. Always verify current requirements with your local building department, planning office, or a licensed professional before starting construction. Homestead Steel Structures & Design is not a legal authority on building codes or zoning regulations. Last updated February 2026.
