While the contractor "can" record a lien, the question is whether the recorded (not filed) lien is legally defensible. This area of the law is complex. If the Contractor did record a Mechanics' Lien, he was required to provide you (presumably the homeowner) written notice of the recordation of that instrument. If the Contractor did not provide the required notice, the lien may not be valid. If the work was performed by a Contractor on your home, your contractual rights and remedies will be...