Is there a minimum amount of time to wait before a contractor can file a mechanics lien on disputed work? Our insulation installer failed the first two county inspections last week and demands immediate payment on his original quote or he will place a lien on the house. I've told him we will pay his invoice (minus the costs it takes us to get his work up to code) once we pass the third inspection--all told, he will get paid within two weeks of completing his work.