A residential home builder hired my company to do Audio, networking, burg alarm, cameras. We started work in oct 2018. The ongoing project just finished up. Our last day onsite was 3-16-2020. After the builder made a bunch of changes over the course of the project the homeowner (son of the builder) does not want to pay. I have had no direct dealing with the son. Everything has gone through the builder. He said changes made by the builder to the audio are not what he wanted and refuses to pay for anything. Can I file a lien on the property?