Minnesota makes notice a condition of the lien itself. The statute says plainly: "A person who fails to provide the notice shall not have the lien and remedy provided by this chapter." (Minnesota Legislature, Sec. 514.011) Check the notice at the start of the job, alongside the contract and work order, rather than waiting for a payment problem.
Start with the written contract. A person who signs a contract with the owner and also contracts with subcontractors or material suppliers must include the required notice in "any written contract with the owner" and must give the owner a copy of that contract. (Minnesota Legislature, Sec. 514.011)
Subcontractors and suppliers have a matching notice to give. Its wording tells the owner it can pay them directly and deduct the amount from the contract price, or withhold the amount due from the contractor until 120 days after completion unless the contractor supplies a lien waiver signed by the subcontractor or supplier giving notice. (Minnesota Legislature, Sec. 514.011) Use the statutory wording rather than your own summary. Check the notice against that wording before it goes out, and keep a copy in the job file.
If there is no written contract, the rule changes. The notice "must be prepared separately and delivered personally or by certified mail to the owner or the owner's authorized agent within ten days after the work of improvement is agreed upon." (Minnesota Legislature, Sec. 514.011) Many small jobs start with a phone call and a verbal yes, and that is exactly when this step gets skipped. Make the job-start checklist ask, before the first visit, whether a written contract exists.
Lien waivers appear in both notices, and they matter at the end of the job. The owner's notice language ties withholding to a waiver signed by people who supplied labor or materials and gave timely notice. (Minnesota Legislature, Sec. 514.011) Ask for the waiver before the final payment goes out, and read exactly what it covers before you sign. If the wording is unclear, ask counsel first.
Information also has to flow up the chain. A contractor who hires subcontractors or suppliers must, on request, give them the owner's name and address within 10 days of the initial request. (Minnesota Legislature, Sec. 514.011) If your firm is the one being asked, record when the request arrived, answer it inside the statutory window, and keep a copy of the reply.