I WAS PRIMARY CONTRACTOR ON ILLINOPIS PROPERTY. HOW MANY MONTH AFTER COMPLETION I HAVE TO FILE A MECHANICS LIEN? WITHIN 2 YEARS AFTER COMPLETION WHAT DOES IT MEAN TO PREVAIL OVER ORIGIONAL OWNER? CAN I STILL FILE IF IM PRIMARY CONTRACTOR AFTER THE PROJECT WAS COMPLETED ABOUT 6 MONTH AGO? 4 Months Must be filed within 4 months after completion of work to get priority over owner and third parties. Within 2 years after completion of work to prevail over original owner.