Washington Revised Code Title 48. Insurance § 48.18.230. Binders--Duration--Premium

(1) A “binder” is used to bind insurance temporarily pending the issuance of the policy. No binder shall be valid beyond the issuance of the policy as to which it was given, or beyond ninety days from its effective date, whichever period is the shorter.

(2) If the policy has not been issued a binder may be extended or renewed beyond such ninety days upon the commissioner's written approval, or in accordance with such rules and regulations relative thereto as the commissioner may promulgate.

(3) Where the premium used in the binder differs from the actual policy premium by less than ten dollars, the insurer shall not be required to notify the insured and may use the actual policy premium.