No need to install software, just go to DocHub, and sign up instantly and for free. Here are 9 tips to draw a For Sale By Owner contract in Washington: 1.Write a Clear Title 2. A Washington residential purchase agreement is used when making an offer to purchase real estate. The agreement initiates the negotiation process. A Washington purchase agreement documents the sale of a piece of real property for a specified financial figure. You'll need to fill out or obtain at least 14 documents, including the purchase agreement, closing statement, and bill of sale. For all active MLS4owners customers with current MLS numbers, we offer standard statewide real estate purchase and sale agreements, addendums and disclosures.