This document summarizes Minnesota mechanics' lien laws. It explains that contractors and subcontractors who improve real property by providing labor, materials, or services can obtain a mechanics' lien on the property if they are not paid. To obtain a lien, a notice must be provided to the property owner and a lien statement must be filed within 120 days of the last date work was performed. The lien takes effect when work begins and is superior to later-recorded mortgages. To preserve the lien, a foreclosure action must be commenced within one year.