Assuming you are a licensed contractor in the state that you reside in and where the work of improvement was done by you, the best type of attorney to discuss the lien issue that I presume there is no judgment upon is an attorney that does construction law.Such an attorney will know about pre-lien requirements, lien requirements and filing suit to foreclose upon the lien. If you did not file a pre-lien on the work of improvement that you have written about and are not the general contractor on the project, you might not be able to file a lien under your state's statutes on the topic.However, you still would be able to file suit for common counts or possibly breach of contract. I suggest that you consult with a construction attorney as soon a possible about the matter that you have written about.