Many construction projects have mechanic’s liens taken out against them. Individuals and companies who work on construction projects or who supply materials may record liens against the property to ensure they are paid for work upon completion. If they are not paid, the lien holder may seek to foreclose. A much more common occurrence is for a property owner to negotiate and/or pay money owed once a foreclosure is possible. Commonly called construction liens, these liens to ensure payment by sub-contractors can burden real property or chattels (non-real property, i.e., non-real estate), but are usually, in construction projects, only taken against the real property that is the basis for the dispute. Construction liens also have serious limitations. First, construction liens, even in California, are not permitted on projects funded by the U.S. government. In cases involving the federal government where construction is taking place, other laws protect sub-contractors. Specifically, on federal projects, general contractors must be sufficiently bonded so the need for a lien will not arise.