For purposes of seeking payment on a construction related project in the California construction industry, the proper legal classification of the party seeking payment is of key importance. Whether one in contract with a prime contractor is a subcontractor or a material supplier determines the availability for mechanics’ liens, stop payment notices and payment bond claims. Generally, those in contract with subcontractors have the ability to assert mechanics liens, stop payment notices and payment bond claims against the owner, general contractor and/or sureties. On the other hand, those who supply materials to material suppliers are generally not entitled to assert a mechanics lien, stop payment notice or payment bond claim. The “rule” has generally been stated as: “A supplier to a supplier has no lien rights.” However, this rule is not always true.