Oregon Revised Statutes Occupations and Professions § 701.305

(1) A contractor may not perform work to construct, improve or repair a residential structure or zero-lot-line dwelling for a property owner without a written contract if the aggregate contract price exceeds $2,000. If the price of a contract was initially less than $2,000, but during the course of performance the contract exceeds that amount, the contractor shall mail or otherwise deliver a written contract to the property owner not later than five days after the contractor knows or should reasonably know that the contract price will exceed $2,000. Failure to have a written contract will not void the contract.

(2) The Construction Contractors Board shall adopt rules that require a contractor to use standard contractual terms in a construction contract for which subsection (1) of this section requires a written contract. The standard contractual terms shall be clear and use words of common understanding.