Minn. Stat. § 326B.809 – Written Contract Required

(a) All agreements including proposals, estimates, bids, quotations, contracts, purchase orders, and change orders between a licensee and a customer for the performance of a licensee's services must be in writing and must contain the following:
1. (1) a detailed summary of the services to be performed;
2. (2) a description of the specific materials to be used or a list of standard features to be included; and
3. (3) the total contract price or a description of the basis on which the price will be calculated.
(b) Before entering into an agreement, the licensee shall provide a prospective customer with written performance guidelines for the services to be performed. Performance guidelines also must be included or incorporated by reference in the agreement. All agreements shall be signed and dated by the licensee and customer.
(c) The licensee shall provide to the customer, at no charge, a signed and dated document at the time that the licensee and customer sign and date the document. Documents include agreements, performance guidelines, and mechanic's lien waivers.