St. Croix County Building Permits & Rules
Everything you need to know about building permits, regulations, and local requirements for home improvement projects in St. Croix County, Wisconsin.
St. Croix County does NOT issue building permits. Each city and town within St. Croix County handles its own building permits independently through local building inspectors. Contact your municipality's building inspector for all permit applications. The county issues land use and zoning permits only.
City Building Departments
Contact the building department for the city where your property is located. Below are the major cities in St. Croix County served by TenPenny Home with their office and contact details.
City of Hudson
505 3rd St, Hudson, WI 54016
(715) 386-4765
buildinginspector@hudsonwi.gov
St. Croix County Zoning
1101 Carmichael Rd, Hudson, WI 54016
(715) 386-4680
cdd@sccwi.gov
Common Permit Types & Typical Fees
Most home improvement projects in St. Croix County require permits. Fees vary by city and project scope, so always verify with your specific city.
Roofing Permit
$100 - $350Required for roof replacement, re-roofing, and structural roof repairs. Wisconsin Uniform Dwelling Code applies.
- Complete tear-off and replacement
- Re-roofing over existing
- Ice and water shield required
Building Permit (New Construction)
$500 - $3,000+Required for new homes, additions, and major remodels. Includes all trades under combination permit system. Fees based on project valuation.
- Wisconsin Uniform Dwelling Code Seal required
- Combination permit includes building, electrical, plumbing, HVAC
- Plan review required
- Multiple inspection points
Accessory Structure Permit
$150 - $600Required for garages, sheds, and outbuildings. Structures over certain square footage require permits, varies by municipality.
- Site plan showing setbacks
- Foundation requirements
- Electrical if applicable
- Compliance with zoning setbacks
Frequently Asked Questions
Common questions about St. Croix County combination permits, Wisconsin contractor registration, ice and water shield requirements, and unpermitted work consequences.
How does Wisconsin contractor registration differ from Minnesota licensing?
Wisconsin uses a state registration system through the Department of Safety and Professional Services (DSPS), different from Minnesota's DOLI licensing. Contractors doing permitted work in St. Croix County must hold Wisconsin state registrations for their trade. If you're hiring a contractor based in Minnesota, verify they also hold Wisconsin DSPS registration, not all do. Check credentials at the Wisconsin DSPS contractor lookup before hiring for any permitted project in St. Croix County.
Why is ice and water shield required on St. Croix County roofs?
Wisconsin's Uniform Dwelling Code requires ice and water shield underlayment on all residential roofs, a vapor barrier installed along eaves and valleys to prevent water infiltration from ice dams. St. Croix County winters produce the same freeze-thaw conditions as Minnesota, making ice dams a real risk. This is a code requirement that must be verified at inspection, roofing permits in St. Croix County will not pass final inspection without it properly installed.
What happens if I do work without a permit in St. Croix County?
Local building inspectors can require completed work to be opened or demolished for inspection at your cost. Wisconsin law also allows for stop-work orders and fines for unpermitted construction. Unpermitted work must be disclosed when selling and can delay or kill a sale. For properties near the St. Croix River, unpermitted work may also trigger separate county zoning enforcement with additional penalties.
General Permit Application Process
Wisconsin uses the Uniform Dwelling Code for residential construction. Most towns and cities in St. Croix County use combination permits that include building, electrical, plumbing, and HVAC under one permit. Processing times typically range from 2-3 days for simple projects to 1-2 weeks for complex builds.
- Identify Your Municipality
Determine which town or city your property is in. Contact your local building inspector or inspection agency, most municipalities contract with private agencies.
- Prepare Required Documents
Gather site plans, construction drawings, contractor credentials, and project specifications. Wisconsin requires state registrations for contractors in most trades.
- Submit Application & Pay Fees
Submit application to your local building inspector with required documents. Pay fees by check or cash (credit cards not accepted in most municipalities). Allow 2-3 days minimum for processing.
- Schedule Inspections
Schedule required inspections at least one business day in advance. Wisconsin Uniform Dwelling Code requires specific inspection points. Keep permit card and approved plans on-site.
St. Croix County Building Considerations
Climate Zone 6A
Cold climate requires R-49 attic insulation, R-20 walls, and proper air sealing per Wisconsin Energy Code. Heating system sizing critical for cold winters.
90 MPH Wind Load
Roofing and siding materials must meet wind resistance requirements. Proper fastening patterns required for all exterior work.
48" Frost Depth
All footings must extend at least 48 inches below grade in Wisconsin to prevent frost heave. Deeper than Minnesota requirements.
St. Croix River & Shoreland
Properties near St. Croix River and lakes have special shoreland management requirements. Additional county zoning permits required for shoreland properties.
Cities & Towns in St. Croix County
Click on your city to find local contractors and city-specific information. For building permits, contact your local building inspector directly.