King County, WA Rental Property Rules: Rent Control (2026)
Rent control rules in King County, WA, also known as rent stabilization or rent cap ordinances, limit annual rent increases and protect tenants from displacement.
Key Facts
- Preemption
- RCW 35.21.830
- Rent Increase Notice
- 60 days, RCW 59.18.140
- Can King County Cap Rent
- No, state preempted
- Landlord-Tenant Act
- RCW 59.18
Summary
Washington state law (RCW 35.21.830) preempts local rent control in King County and all Washington jurisdictions. Neither King County nor any city within it may cap rent increases. Landlords must follow state notice requirements for rent increases under RCW 59.18.140 (minimum 60 days notice typically, 180 days in some cases).
RCW 35.21.830 Controls on rent for residential structures — Prohibited — Exceptions. The imposition of controls on rent is of statewide significance and is preempted by the state. No city or town of any class may enact, maintain, or enforce ordinances or other provisions which regulate the amount of rent to be charged for single-family or multiple-unit residential rental structures or sites other than properties in public ownership, under public management, or properties providing low-income rental housing under joint public-private agreements for the financing or provision of such low-income rental housing. This section shall not be construed as prohibiting any city or town from entering into agreements with private persons which regulate or control the amount of rent to be charged for rental properties. [ 1981 c 75 s 1 .] Notes: Applicability to floating home moorage sites — 1981 c 75: "Nothing in this act shall be construed to preempt local ordinances that relate to the control of rents or other relationships at floating home moorage sites." [ 1981 c 75 s 3 .] Severability — 1981 c 75: "If any provision of this act or its application to any person or circumstance is held invalid, the remainder of the act or the application of the provision to other persons or circumstances is not affected." [ 1981 c 75 s 4 .]
Full Breakdown
King County and all cities within Washington are preempted by state law from enacting rent control. 830 expressly prohibits cities, towns, counties, and municipal corporations from enacting, maintaining, or enforcing any ordinance or charter provision that regulates the amount of rent to be charged for residential rental properties. This statewide preemption has been in place since 1981 and has survived multiple legal challenges and legislative repeal attempts. In practice, this means a landlord in unincorporated King County or any city within the county may raise rent by any amount, subject only to (1) the terms of the lease (a fixed-term lease generally locks in rent for the term), and (2) state notice requirements.
140, for month-to-month tenancies, a landlord must give at least 60 days written notice before a rent increase takes effect. For certain assisted-housing situations, 180 days notice may be required. Seattle and other Washington cities have adopted renter protections that go to the edge of what state law allows: just-cause eviction, notice of rent increases beyond state minimums, relocation assistance when increases exceed a threshold, and mandatory information packets. King County itself has enacted some related tenant protections but not rent caps. Washington state lawmakers have introduced rent stabilization legislation in recent sessions; residents interested in rent control should track state-level bills rather than local ones.
Violations & Fines
No rent caps to violate. A landlord who raises rent without proper notice (less than 60 days written notice for month-to-month) violates RCW 59.18.140; the tenant can challenge the increase and the landlord may owe damages under RCW 59.18.290.
Frequently Asked Questions
Does King County have rent control?
How much notice must a landlord give for a rent increase in King County?
Sources & Official References
Other rules in King County
Compare King County to another location·View the Washington rental property rules overview
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