Almost every home seller in WA must complete a Seller Disclosure Statement, aka the Form 17. Learn more, and get a copy you can use for free!Hey Buddy Buck here! 020) since January 1, 1995. Nearly all real estate sales in Washington State require a seller disclosure statement, also known as Form 17, to be given to the buyer. Please complete the following form. Do not leave any spaces blank. To be used in transfers of improved residential real property, including residential dwellings up to four units, new construction,. You can get this form from your real estate broker. 25 of the sale, and all contingencies in the sale agreement have been waived.