Do I Need a Permit to Add Insulation in Wisconsin?
Adding insulation may or may not require a permit depending on the scope. Blown-in attic insulation is often exempt; wall modifications are not.
Yes, you typically need a permit. Requirements vary by municipality. Check with your local building department for specifics.
Where to Apply
Permit requirements, fees, and processing times vary by municipality. Check the specific requirements for your location:
Browse all jurisdictions →Frequently Asked Questions
Do I need a permit to add attic insulation?
Adding blown-in or batt insulation to an attic without modifying the structure typically does not require a building permit. However, if you are modifying venting or electrical, permits may be needed.
What about spray foam insulation?
Spray foam insulation that is applied as part of a renovation project covered by a building permit will be inspected with the rest of the work. Standalone spray foam jobs may not require a separate permit in all municipalities.
What R-value is required in Wisconsin?
Wisconsin energy code requires R-49 in attics, R-21 in walls, and R-10 for basement walls for new construction and additions. Existing homes undergoing renovation may have different requirements.
Building in multiple cities?
See permit requirements for any Wisconsin municipality instantly. Compare fees, timelines, and processes side by side across your active jurisdictions.