A Washington Partial Waiver of Lien is a legal document in which one party waives a claim or right to a certain amount of payment from the other party. The waiver is typically used in construction projects in the state of Washington, and it is used to facilitate the payment process between two parties. The waiver applies to a portion of the payment that is specified in the document and is used to confirm that the releasing party has been given partial payment and no longer has a claim on the payment for the specified amount. The two types of Washington Partial Waiver of Lien are a Conditional Waiver and Release Upon Payment and a Unilateral Waiver and Release of Lien. The former is used when an owner has agreed to pay a contractor, but the contractor has not yet received payment. The latter is used when a contractor has received payment but wishes to confirm the amount paid and waive any future claims to the payment.