Wash. Rev. Code § 59.12 § 59.12.150
Amendment to conform to proof.
Operative Text
When upon the trial of any proceeding under this chapter it appears from the evidence that the defendant has been guilty of either a forcible entry or a forcible or unlawful detainer, in respect of the premises described in the complaint, and other than the offense charged in the complaint, the judge must order that such complaint be forthwith amended to conform to such proofs; such amendment must be made without any imposition of terms. No continuance shall be permitted on account of such amendment unless the defendant shows to the satisfaction of the court good cause therefor.
Under Wash. Rev. Code § 59.12.150, if evidence presented at trial reveals that a defendant committed a forcible entry or unlawful detainer different from what was originally charged in the complaint, the court is required to amend the complaint on the spot to match the evidence. This amendment happens automatically and without any cost or penalty imposed on either party. A delay in the proceedings due to the amendment is only allowed if the defendant can demonstrate good cause to the court's satisfaction.
Plain English — not legal advice.
Wash. Rev. Code § 59.12.150 means that a landlord's eviction case is not necessarily lost simply because the evidence at trial points to a slightly different type of unlawful detainer or forcible entry than what was originally pleaded. Courts operating under this chapter are required to update the complaint to reflect what the evidence actually shows, without penalizing the landlord for the discrepancy. Operators who maintain thorough documentation of tenancy violations generally find it easier to support whatever theory of removal the evidence ultimately supports.
General guidance for property managers — not legal advice for your specific situation. Consult an attorney for advice on your case.
Under Wash. Rev. Code § 59.12.150, tenants should be aware that the complaint against them can be amended mid-trial to reflect a different type of forcible entry or unlawful detainer if the evidence supports it. However, if such an amendment occurs, a tenant may request a continuance — a delay in the proceedings — by showing the court good cause for needing more time to respond to the amended charge. Tenants facing this situation may benefit from consulting a tenant-rights organization or legal aid provider familiar with Washington's unlawful detainer procedures.
General guidance for tenants — not legal advice for your specific situation. Consult a tenant-rights organization or attorney for advice on your case.
Generated October 7, 2026 — auto-generated, not yet human-reviewed. See /transparency for methodology.
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