2015 ORS § 701.310¹
Cancellation of contract

(1) A property owner who enters into an initial written contract for the construction, improvement or repair of a residential structure or zero-lot-line dwelling on real property owned by the property owner may cancel the contract by delivery of a written notice of cancellation anytime prior to 12 midnight at the end of the next business day. The notice of cancellation may be delivered in any written form or by any means that can readily be converted to written form, including, but not limited to, facsimile, electronic mail and regular mail. The notice must state the intention of the property owner to cancel the contract.

(2) Subsection (1) of this section does not allow a property owner to cancel a contract:

(a) If both parties agree that work is to begin before the cancellation period has expired;

(b) After a contractor substantially begins the residential construction, improvement or repair; or

(c) When an initial contract is being modified after expiration of the initial cancellation period. [2007 c.648 §8; 2009 c.409 §2]