What if a Washington rent increase violates the cap?
An increase above RCW 59.18.700 series's cap is unenforceable. The tenant may continue paying the prior rent or the rent at the cap level. The excess is not legally owed. The tenant may also seek refund of any excess paid plus, in some states, attorney fees and damages. 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. Reporting to the state housing agency (where applicable) is an additional remedy. Most Washington small landlords settle quickly when the cap is pointed out.
Source: RCW 59.18.140 (90-day advance notice for any rent increase, HB 1217)
This is an informational answer based on RCW 59.18.140 (90-day advance notice for any rent increase, HB 1217) as of early 2026. It is not legal advice. Housing law changes year to year and local ordinances (especially in rent-controlled or rent-stabilized cities) can override or add to state law. For contested cases, consult a Washington-licensed attorney.