ORS 479.670: Maintenance of action or suit by unlicensed person prohibited.

Except to appeal from an act or determination of the Electrical and Elevator Board, no person carrying on, conducting or transacting business regulated by ORS 479.510 to 479.945 and 479.995 is entitled to maintain a suit or action in the courts of this state involving such business or work in connection therewith, without alleging and proving that the person was licensed to perform such work or transact such business.