Our company designs and manufactures custom metal products for use in construction applications. From my understanding most states have a time limit for delivering a preliminary notice that starts at the date of first furnishing materials or labor. Since our products are custom designed, each project might have 8-12 weeks of design and manufacturing work that occurs prior to anything being delivered to the site. Is the date of first furnishing generally when the design process starts or when the product is delivered on site? And to follow up, if work is stopped and we go unpaid prior to product being delivered to the site do we have any lien rights? A large portion of our work is in California, but we deliver products all over the US.