Go to your states web site and find out about your laws concerning "property liens"
If you don't have a written contract, you'll probably be hooped.
There is generally a time limit on filing after an account is late.
Where I am it is 45 days past the date on the invoice. So, if my clients haven't paid after thirty days, I only have another two weeks to file the Builder's Lien.
We cannot recoup court costs or filing costs either.
You should also look up small claims court.
Personally, I think you will never see that money. Sorry.