Hi. We hired a contractor in New York City to renovate a bathroom in October 2017. We paid him $12,150 but held back $1350 because the work not completed to our satisfaction. In December 2017 he said he was done with the job. I pointed out what was not done in person and after that he did not respond to my last communication in January 2018. In October 2018 (10 months later) he emailed asking for the additional payment. We responded with notice of the work still unfinished. We did not hear from him again until this past October 2019, one year later. This October he revised the amount we owed by adding $600, making up charges that he had never mentioned in January 2018. Now he has threatened a lien will be placed the end of this week for $1950. Is there a deadline for him to file the lien? Seems unreasonable that he can come back 21 months after leaving the job and that he can add an additional amount. Do I need a lawyer to prevent this from happening? Thanks