The state of Washington has some very specific laws and requirements regarding the right to file a mechanics lien. Let's break down your question into two parts.
1) Do I need to be licensed to file a Washington mechanics lien?
If the work performed requires registration in the state of Washington, then you will not have the right to file a mechanics lien. Not only that, but according to RCW 18.27.080, if performing work without registration the contractor will also not be able to bring or maintain any action in any court... for the collection of compensation for the performance of any work or for any breach of contract. As you can see, Washington takes contractor registration very seriously.
To find out more about what type of work requires registration, you can visit the WA State Department of Labor & Industries page for the details.
2) Do I need a written contract to file a Washington mechanics lien?
As for whether a written contractis required to file a Washington mechanics lien, the answer is no. The mechanics lien statutes make no mention of requiring a written contract. Therefore, mechanics liens may be filed for work performed under an oral contract as well.
NOTE. The information presented here is for informational purposes only. It is not legal advice and should not be construed nor relied upon as such. Furthermore, this posting does not create an attorney-client relationship. If you need legal advice, seek the counsel of a licensed, local attorney.See More...See More...
You do not need a county business license to be able to record a lien for construction work in Washington. You must, however, be properly insured, bonded and registered with the Department of Labor & Industries to have lien rights. Depending on what level of subcontractor you are, you may also be required to send a prelien notice to the owner before you have lien rights.