Before he can put a lien on the house, he has to go to court. What might be easiest is just to settle this case with him for a certain amount and get it in writing. Perhaps he'll take $1,500 and cut your losses. It's all not so simple here because you made a number of verbal agreements that aren't memorialized in a writing and you may end up engaging in a "he said she said" situation where opinions differ as to what exactly was said.