A mechanics lien is a legal tool that provides the unpaid party with a security interest in the property. A property lien can be defined as a legal action where a creditor obtains a debt due from a debtor through an interest in property.Washington State Lien Law Summary- Who may have a lien in Washington State? What is a lien law against? The term "claim of lien" refers to a written assertion of lien rights for work on a specific project. A claim of lien must be recorded to be effective. In the event you or your contractor fail to pay us, we may file a lien against your property. Filing a lien is security for payment and, if you foreclosure on the lien, you can force the sale of the property. Payment disputes and delays are fairly common in the construction business. Form filed with County Auditor to claim a lien for unpaid amounts.