Yes, a lease can automatically renew in Washington. Most rental agreements will automatically renew when the initial tenancy period is over. Past this point, the lease becomes a month-to-month rental agreement, with the same basic terms and conditions otherwise as the original lease. In some cases, such as if rent is being paid weekly, the lease may become a week-to-week lease.
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The information for this answer was found on our Washington Residential Lease Agreement answers.