What rent control exemptions apply in Washington?

Where Washington has a statewide or local rent cap, the statute typically exempts several categories: newer construction (usually buildings less than 15 years old, sometimes "rolling" 15-year window), single-family homes owned by individual landlords (often with disclosure requirement), affordable housing already regulated under separate program, owner-occupied buildings of 2 to 4 units, and units already covered by a different rent stabilization program. The exemptions are statute-specific and frequently litigated. A landlord claiming an exemption usually must give the tenant a written notice of the exemption status (form prescribed by statute) at lease signing or before the increase. 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.

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