What You Need to Know about the Washington State Seller Property Disclosure – Form 17. Washington State requires sellers of residential real property to thoroughly disclose material facts on a form called the Residential Real Property Disclosure Statement (often referred to as Form 17).
While sellers have always been required to disclose material facts, the Form 17 has been required by law (RCW 64.06. 020) since January 1, 1995. It has undergone ten revisions since its inception, the last of which went into effect in 2021.