Answer from the Department of Labor and Industry (DLI): "DLI strongly recommends hiring a contractor licensed by the state of Minnesota. That ensures the company has met certain requirements, including having a principal of the company pass an appropriate examination and having liability and property damage insurance. A licensed contractor must also take a number of continuing education classes each year."
If you have questions about the licensing status of a contractor, you can check on the State website.
Some work does not require a license or a permit, if you have specific questions feel free to call us at the City 651-638-2050 or email the Building Department.
Please reference the State of Minnesota's Consumer Guide to Hiring a Contractor (PDF).