ORS 693.180: Denial of right to court action for unlicensed plumber or unqualified apprentice.

A person who provides services connected with plumbing, as defined in ORS 447.010, may not bring or maintain an action in the courts of this state to recover for those services unless the person alleges and proves that, at the time the services were performed, the person performing the services either:

      (1) Held a valid journeyman plumber license; or

      (2) Was an apprentice plumber.