Can a Washington tenant challenge a rent increase in court?

Yes, in two scenarios. First, if the increase exceeds a statutory rent cap that applies to the unit (where Washington or local law limits annual increases), the tenant can challenge the excess amount in court or through the local rent board. The remedy is usually rent abatement and refund of overpayment. Second, if the increase notice itself was procedurally defective (insufficient notice period, improper service, missing required disclosures), the tenant can challenge the increase as void and continue paying the old rent until proper notice is served. Both challenges typically require the tenant to first dispute the increase in writing to the landlord. Washington HB 1217 (2024) requires 90 days advance notice for any rent increase, prohibits any increase during the first 12 months, and caps annual increases at the lower of CPI + 7% or 10% flat. Buildings under 12 years old are exempt. The rent cap framework sunsets July 1, 2040. Tenants should consult with a local fair-housing or tenant-rights organization before withholding rent based on a perceived improper increase, as nonpayment can become its own ground for eviction.

Source: RCW 59.18.140 (90-day advance notice for any rent increase, HB 1217)