To file an unlawful detainer in Washington State, you need a summons and a complaint filed in the superior court for the county where the property sits, filed only after you have served the correct pre-suit notice and waited out its deadline. Along with those two core documents, most filings also include a case information cover sheet, and, if you intend to seek a fast ruling, a motion and proposed order to show cause. The unlawful detainer forms Washington State landlords use are available as a statewide packet from the Washington Courts, though some counties layer on local versions.1Washington State Courts. SCJA Unlawful Detainer Work Group Forms Packet The initial residential filing fee is $135.
Serve the Right Notice Before You File Anything
No unlawful detainer case moves forward without proof that you first gave the tenant proper written notice, and the notice you serve determines what you can later file. File before the notice period has run and the court will dismiss the case.
- Nonpayment of rent: a 14-day pay-or-vacate notice for residential tenancies under Chapter 59.18 RCW.2Washington State Legislature. RCW 59.12.030 Unlawful Detainer Defined
- Lease violation other than rent: a 10-day comply-or-vacate notice. The tenant, a subtenant, or anyone with a stake in the tenancy can cure the violation within that window.2Washington State Legislature. RCW 59.12.030 Unlawful Detainer Defined
- Month-to-month termination: at least 20 days before the end of the rental period.2Washington State Legislature. RCW 59.12.030 Unlawful Detainer Defined
- End of a fixed-term lease: no separate notice is required; the tenancy ends on the stated date.
Keep a copy of every notice you serve and proof of how and when you delivered it. That proof of service travels with your complaint and shows the court the statutory clock actually ran.
The Core Filing Package
Once the notice period has expired without the tenant paying, curing, or moving, you file the lawsuit. Three documents do the main work, and a fourth pair is common if you want a quick hearing.
Summons
The summons notifies the tenant of the lawsuit and sets a return date by which they must respond. Washington law requires that return date to fall between 6 and 12 days after service.3vLex. Canterwood Place LP v Thande This window is jurisdictional. Setting a date outside it does not delay the case; it voids it.
Complaint
The complaint identifies you and the tenant, gives the address of the property, states the basis for eviction, describes the notice you served and the date you served it, and asks the court for specific relief, typically return of the premises plus unpaid rent. A standardized complaint form is included in the statewide unlawful detainer packet, though some counties have their own version.1Washington State Courts. SCJA Unlawful Detainer Work Group Forms Packet
Case Information Cover Sheet
Most filings include a Case Information Cover Sheet for the clerk’s records. Check your county’s local rules for the version they use.
Motion and Order to Show Cause
If you want the court to set a hearing rather than waiting on the tenant’s answer, add a Motion for Order to Show Cause and a proposed Order to Show Cause. The order, once signed by a judge, sets the hearing date at which the tenant must appear and explain why the court should not order eviction.
Military Affidavit for a Default Judgment
If the tenant never responds and you want a default judgment, federal law requires you to file an affidavit stating whether the tenant is on active military duty. The requirement comes from the Servicemembers Civil Relief Act.4Office of the Law Revision Counsel. 50 USC 3931 If you cannot determine the tenant’s status, the affidavit has to say so, and the court may require a bond before entering judgment. Without this affidavit, the court will not enter default.
Supporting Documents to File With the Complaint
The forms open the case; the exhibits win it. A few categories come up in almost every filing.
A rent ledger is the single most important exhibit in a nonpayment case. It should show every payment received, the date received, the amount, and the period it covered. Gaps invite the argument that missing records mean missing payments the tenant actually made.
A copy of the lease is necessary whenever the eviction rests on a lease violation, because the court needs to see the specific term the tenant allegedly broke. For verbal or month-to-month arrangements, document what you can prove about the agreed rent and the payment date.
For evictions based on property damage or illegal activity, attach photographs, repair estimates, or police reports as exhibits to the complaint. Visual evidence carries more weight than description.
If the property is in Seattle, the city’s Just Cause Eviction Ordinance limits residential evictions to 16 approved reasons and requires the termination notice to state the specific cause and the supporting facts.5City of Seattle. Just Cause Eviction Ordinance Other cities have their own layered requirements, so check local rules before drafting your notice.
Where to Get the Forms and Where to File
The Washington State Courts website hosts a standardized forms packet developed by the Unlawful Detainer Work Group, including templates for pay-or-vacate notices, comply-or-vacate notices, the summons, the complaint, and several post-filing motions.1Washington State Courts. SCJA Unlawful Detainer Work Group Forms Packet Confirm your county’s superior court website before relying entirely on the statewide versions.
You file everything with the Superior Court Clerk’s Office in the county where the rental property sits. In King County, attorneys must e-file through the clerk’s online system, though self-represented landlords can still file on paper.6King County. LGR 30 Mandatory Electronic Filing and Service Practice varies elsewhere. If you file in person, bring at least three copies of each document: the clerk keeps the original, you keep a file-stamped copy, and you need a third copy to serve on the tenant.
Filing Fees
Fees are set by statute, so they are the same in every county. The base residential filing fee is $45, but mandatory surcharges bring the amount you actually pay at the counter to $135.7Washington State Legislature. RCW 36.18.020 Clerk’s Fees, Surcharges That $135 covers a default judgment path. If the tenant files an answer or the court issues an order to show cause, add $112, bringing the total to $247. Commercial unlawful detainer filings start at $290.
A writ of restitution costs $20 to file. Sheriff service of the writ runs $25 without assistance, or $40 plus $30 per hour after the first hour if the sheriff needs backup to carry out the eviction.8Washington State Legislature. RCW 36.18.040 Sheriff’s Fees
If you cannot afford the filing fee, ask the court to waive it under General Rule 34 by filing a motion and declaration explaining your financial situation.9Washington State Courts. General Rule 34 Request for Waiver of Civil Filing Fees and Surcharges
Serving the Filed Documents on the Tenant
Filing with the clerk is only half the job. You have to serve the tenant with the summons and complaint, and defective service voids the entire action rather than merely delaying it.3vLex. Canterwood Place LP v Thande
Personal service is the preferred method. Someone who is not a party to the case, typically a private process server or the county sheriff, physically hands the documents to the tenant and then signs a declaration of service that you file with the court.
If personal service fails after genuine effort, Washington allows alternative service by posting and mailing. You must first attempt personal service at least three times over at least two days, at different times of day. If those attempts fail, post the summons and complaint in a visible spot on the property and mail copies by both regular and certified mail to the tenant’s last known address. Both the posting and the mailing must happen at least nine days before the return date on the summons.10Washington State Legislature. RCW 59.18.055 Notice, Alternative Procedure, Court’s Jurisdiction
Whatever method you use, the return date on the summons still has to fall between 6 and 12 days from the date of service. If the math doesn’t work, service is defective and you start over.
Paperwork Errors That Kill Cases
Washington courts enforce procedural requirements strictly in unlawful detainer cases. A missing element, an outdated form, or a notice that ran one day short of the statutory period can all lead to dismissal, and dismissal means re-serving notice, waiting out the full period again, and refiling while the tenant stays in the unit.
Some errors are fixable without starting from scratch. A Motion to Amend Complaint can correct a defect in the complaint, subject to the court’s approval and possibly an additional fee. Errors in service are different: an amended complaint will not cure them. You re-serve the corrected documents, and the return-date clock resets.
The mistakes that kill cases most often are the same ones every time. Serving a 3-day pay-or-vacate notice where residential law requires 14 days. Filing before the notice period has fully expired. Setting a return date on the summons that falls outside the 6-to-12-day window. Skipping personal service attempts and going straight to posting and mailing. Each of these is fatal, and each one keeps happening. Having an attorney review the packet before you file costs far less than starting over.