If you are considering filing a complaint against a contractor you should really consider at least consulting with a local attorney in your area that handles construction cases. There are a lot of steps you can mess up and even a short consultation can get you pointed in the right direction.
You should also be aware that If you are able to successfully pursue a bond claim against the contractor, you may also be entitled to attorney’s fees – see RCW 18.27.040(6). This statute is narrowily constructed and is limited, but could make hiring the attorney well worth it.
To check whether a contractor has an impaired bond go the Washington State Department of Labor and Industries website and lookup the contractor. Below I have provided links to Info on Small Claims, L&I website and Contractor’s Registration Statute (RCW 18.27).