In Oregon, the laws are very friendly to service providers, contrators, mechanics, vendors and others who are providing labor, services or supplies for real property development. If you are doing this, you should be very aware of if and how to excercise your lien rights. it can protect you from bankruptcy discharges, it can help you get paid more reliably and it can help make sure you get paid and more quickly for your work. There are some basic practices and things you can work into your invoices, bookeeping, and other tips. ORS Chapter 87 covers these and there are many.