Missouri does not have a general contractors license. However, contractors must register their business with the Missouri Secretary of State and have a sales tax ID# which is issued by the Department of Revenue. After registering, contractors can contact local (county, city, township) government offices for specifics regarding local licensing and regulations.
Frontenac requires North American Board of Certified Energy Practitioners (NABCEP) PV Installation Professionals for solar projects. Clarkson Valley requires either a NABCEP PV Installation Professional or an electrical engineer.
County commissions issue building permits.
Resources: Missouri Business Development Program