How to Serve an Eviction Notice & Unlawful Detainer in Washington

Why Strict Compliance with RCW 59.12.040 Determines Eviction Jurisdiction

Unlawful detainer actions in Washington State are summary statutory proceedings governed by Chapter 59.12 RCW (general forcible and unlawful detainer) and Chapter 59.18 RCW (the Residential Landlord-Tenant Act, or RLTA). Because unlawful detainer statutes provide an expedited remedy for possession of real property, Washington appellate courts—including the Washington Supreme Court—strictly construe every notice and service requirement in favor of the tenant.

If a landlord or property manager fails to serve a 14-Day Notice to Pay or Vacate (RCW 59.18.057), a 10-Day Notice to Comply or Vacate, or a 3-Day Notice for Nuisance/Waste in exact accordance with RCW 59.12.040, the Superior Court lacks jurisdiction to hear the eviction. Even a minor error—such as dropping the mailed copy into a mailbox in King County when the rental unit is across the county line in Pierce or Snohomish County—will result in dismissal at the Show Cause hearing.

The Three-Tier Hierarchy for Serving Pre-Eviction Notices (RCW 59.12.040)

Under RCW 59.12.040, a pre-litigation eviction notice must be served using a mandatory three-step progression for each named adult tenant (and separately addressed to "All Occupants" or "All Other Occupants" if unknown subtenants may reside in the unit):

Tier 1 — Personal Delivery: The server first attempts to personally hand a copy of the notice to each named tenant at the rental premises. If every named tenant is personally handed their copy at the door, service is complete immediately upon hand-delivery, and no mailing is required.

Tier 2 — Substitute Delivery + In-County Mailing: If a named tenant is absent from the premises, the server may leave a copy with a person of suitable age and discretion who is present at the premises, AND mail a separate copy addressed to that absent tenant at the premises address from within the same county.

Tier 3 — Conspicuous Posting + In-County Mailing: Only if no person of suitable age and discretion is present at the premises after knocking/ringing may the server affix a copy of the notice in a conspicuous place on the premises (typically securely taped to the main entry door at eye level) AND deposit a copy in the United States mail, addressed to the tenant at the premises, from a location within the county where the property is situated.

The In-County Mailing Rule and Additional Time Calculation

Two technical traps in RCW 59.12.040 trip up landlords and inexperienced servers more than any other rule in Washington landlord-tenant law. First is the In-County Mailing Mandate: the statute explicitly states that the mailed copy must be deposited in the mail in the county in which the property is situated. When our servers post a 14-Day Notice in Tacoma, they deposit the mail at a USPS facility inside Pierce County; when serving in Everett, they mail from inside Snohomish County; and we document the exact city and ZIP code of mailing on the Declaration of Service.

Second is the Extra Day Rule: RCW 59.12.040 states that service by mail (accompanying substitute delivery or posting) shall not be deemed complete until the expiration of one additional day after the deposit in the mail (and housing justice project attorneys frequently scrutinize whether weekends/holidays or CR 6(a) rules affect the expiration date). Therefore, landlords must never file or serve the Unlawful Detainer Summons and Complaint until the full statutory notice period—plus the mandatory mailing extension—has completely expired without cure.

Serving the Unlawful Detainer Summons, Complaint & Order to Show Cause

Once the predicate notice expires without compliance, the landlord's attorney issues an Unlawful Detainer Summons (using the mandatory statutory form under RCW 59.18.365 for residential tenancies), Complaint for Unlawful Detainer, and usually an Order to Show Cause setting a hearing date in Superior Court.

Unlike the pre-eviction notice, the Unlawful Detainer Summons and Complaint initiate a Superior Court lawsuit and must be served in accordance with CR 4 and RCW 4.28.080—meaning personal delivery to the tenant or substitute abode service on a co-resident of suitable age and discretion at their usual abode. You CANNOT simply "post and mail" an Unlawful Detainer Summons on a door on the first try! Only if diligent personal attempts fail and the landlord obtains a specific court order authorizing alternative service under RCW 59.18.055 may the Summons and Complaint be posted and mailed (which limits the court's judgment to possession only, rather than a personal money judgment).