The filing of a lien is required for a general contractor, subcontractor to protect their Lien rights so they may be compensated for the work that they had performed. Subcontractors ,contractors need to understand the laws in there states that they are working in. When working with construction liens, the timing and content of the lien is very important. If there are missing dates, names of property owners or even a legal description these are just a few , may cause a defect in your lien. Please check with your attorney in your state.