Do I Need a Permit to Install a Mini-Split in Wisconsin?
Mini-split installations typically require both an HVAC/mechanical permit and an electrical permit in Wisconsin.
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 for a ductless mini-split?
Yes. Both a mechanical permit (for the refrigerant line and unit installation) and an electrical permit (for the dedicated circuit) are typically required.
Can I install a mini-split myself?
Some DIY mini-split kits are available, but Wisconsin still requires permits and inspections. Refrigerant handling requires EPA 608 certification.
How many BTUs do I need for a room in Wisconsin?
A general rule is 20-30 BTU per square foot in Wisconsin's climate. A 12,000 BTU (1 ton) unit covers approximately 400-600 square feet.
Building in multiple cities?
See permit requirements for any Wisconsin municipality instantly. Compare fees, timelines, and processes side by side across your active jurisdictions.