Minn. Stat. § 641.22: PLANS AND ESTIMATES SUBMITTED.

After the receipt of the commissioner of correction's advice and suggestions, the board shall procure plans and estimates of the cost of the new jail or repairs, and submit the same to the commissioner for suggestions and for approval, so far as relates to the management, operation, and physical condition of the proposed building, and the security, safety, health, treatment, and discipline of persons detained or confined therein. Suggestions and approval shall be in writing and filed with the county auditor before any contract for purchase, lease, erection, or repairs shall be binding, or any warrant is drawn for payment for labor or materials therefor.