We are in California, and engaged in a time and materials project with a commercial owner and there is no set price. We have an internal debate as to whether a mechanics lien can be filed since there is no set "contract price". My thought is that since there is value being added to the property, the owner shouldn't be able to avoid the contractor's mechanics lien protection, just because the contract was in T&M form. If the contractor can still file a mechanics lien for T&M work, is a preliminary notice still be required? Would you use an estimated value for the T&M job to establish the preliminary notice?