Washington County Building Permits & Rules
Everything you need to know about building permits, regulations, and local requirements for home improvement projects in Washington County, Minnesota.
Washington County does NOT issue building permits for residential construction. Each city and township within Washington County handles its own permits and inspections independently. Contact your city's building department directly for all permit applications, fees, and requirements.
City Building Departments
Contact the building department for the city where your property is located. Below are the major cities in Washington County served by TenPenny Home with their office and contact details.
City of Woodbury
8301 Valley Creek Rd, Woodbury, MN 55125
(651) 714-3543
building@woodburymn.gov
City of Cottage Grove
12800 Ravine Pkwy, Cottage Grove, MN 55016
(651) 458-2804
building@cottagegrovemn.gov
City of Stillwater
216 4th St N, Stillwater, MN 55082
(651) 430-8800
info@ci.stillwater.mn.us
Common Permit Types & Typical Fees
Most home improvement projects in Washington County require permits. Fees vary by city and project scope, so always verify with your specific city.
Roofing Permit
$100 - $300Required for roof replacement, re-roofing, and structural roof repairs across Washington County cities.
- Tear-off and replacement
- Re-roofing over existing
- Wind-rated materials for 90 MPH winds
- Ice dam barriers required
Building Permit (Additions/Remodels)
$200 - $2,000+Required for home additions, structural alterations, finished basements, and room additions. Fees based on project valuation.
- Plan review required for most projects
- Structural engineering may be needed
- Energy code compliance
- Multiple inspection points
Mechanical Permit
$75 - $300Required for HVAC installations, furnace replacements, and ductwork modifications.
- Furnace and AC installations
- Ductwork changes
- Ventilation systems
- Proper sizing and efficiency standardsGeneral Permit Application Process
Frequently Asked Questions
Common questions about Washington County permits, Stillwater historic district design permits, shoreland rules near the St. Croix River, contractor licensing, and unpermitted work.
How do I find out if my Washington County property is in a shoreland area?
Use the Washington County GIS Property Map (linked in the sidebar) to check your property's location relative to the St. Croix River and lakes. Properties within the shoreland management overlay, typically within 1,000 feet of a public water body, require additional county zoning permits on top of your city building permit. Contact Washington County Zoning at the county website before starting any project near water.
Does my contractor need to be licensed in Washington County?
Yes. All contractors doing permitted work must hold a valid Minnesota state license. HVAC, plumbing, and electrical work each require specific state trade licenses. Verify any contractor's license through the DOLI contractor lookup before hiring. If they won't pull a permit, that's a red flag.
What happens if I do work without a permit in Washington County?
Cities can require completed work to be opened or removed for inspection at your cost. A penalty fee equal to the permit fee is typically charged on top. Unpermitted work must be disclosed when selling and can delay or kill a sale. In Stillwater historic districts, additional HPC enforcement may also apply.
General Permit Application Process
Each city in Washington County has its own permit procedures. Many cities offer online permitting systems for faster processing. Simple permits may be issued same-day, while complex projects requiring plan review typically take 1-2 weeks.
- Contact Your City Building Department
Determine which city your property is in and contact their building department. Each city has different requirements, fees, and processing times.
- Prepare Required Documents
Gather site plans, construction drawings, contractor license information, and project specifications. Requirements vary by city and project type.
- Submit Application
Apply online if available, or submit in person at your city building department. Pay applicable fees at time of submission for faster processing.
- Schedule & Pass Inspections
After permit approval, schedule required inspections with your city. Keep approved permit documents and plans on-site for all inspections.
Washington County Building Considerations
Climate Zone 6A
Cold climate requires R-49 attic insulation, R-20 walls, and proper air sealing per Minnesota Energy Code. Energy-efficient construction is essential.
90 MPH Wind Load
Roofing and siding materials must meet wind resistance requirements. Proper fastening patterns required for all exterior work.
42" Frost Depth
All footings must extend at least 42 inches below grade to prevent frost heave. Foundation drainage systems required.
Shoreland Management
Properties near St. Croix River and lakes have special shoreland management requirements. Additional permits may be required from county zoning.
All Cities in Washington County
Click on your city to find local contractors and city-specific information. Contact your city directly for building permit information.