Washington state rent increase laws for owners: the 90 day notice, 2026 cap of 9.683%, the required form, service rules, and how lease renewal really works.
Washington state rent increase laws require a minimum of 90 days written notice for any rent increase, cap most 2026 increases at 9.683%, and prohibit any increase during a tenant's first 12 months. Lease renewal works differently than many owners assume: under RCW 59.18.650, most fixed term leases simply roll to month to month at expiration, and there is no required renewal offer window. This guide walks through the renewal rules, the rent cap, the required notice form, and how to serve every notice correctly.
Start with the rule that surprises the most owners. Under RCW 59.18.650, when a fixed term lease reaches its end date, the tenancy does not terminate by default. Unless a listed exception applies, it becomes a month-to-month tenancy automatically, on the same terms.
There is no statutory renewal offer window in Washington. The law never requires you to offer a renewal at all, and nothing prevents you from sending a renewal offer four, five, or six months before the lease ends. The timing rules in the statute run the other direction: they restrict when a landlord may end a tenancy.
A landlord may end a tenancy without cause at the end of a lease term in only two narrow situations, and each requires at least 60 days advance written notice served before the term ends:
That 60 days is a minimum, not a window. Serving the notice 90 or 120 days out is perfectly lawful. Outside those two paths, you need one of the for-cause grounds listed in the statute, such as a documented sale of a single-family home or owner move-in, each with its own notice period.
Two more renewal mechanics worth knowing. If you proffer a new lease with reasonable terms at least 30 days before the current lease expires and the tenant neither signs it nor vacates, that refusal itself is cause to end the tenancy. The tenant holds an exit right of their own: written notice at least 20 days before the end date.
In practice, we send renewal offers alongside the 90 day rent increase notice; one coordinated packet satisfies every statutory clock with room to spare.
Since May 2025, RCW 59.18.140(3) requires a minimum of 90 days prior written notice for any rent increase, statewide. This applies to month-to-month tenancies and fixed term leases alike.
Two details matter as much as the number:
There is no maximum lead time. Serving the notice 100 or 120 days before the effective date is fine, and that cushion is how professional managers absorb service delays without losing a renewal cycle.
The statewide rent stabilization law, RCW 59.18.700, enacted by HB 1217 in 2025, applies in every Washington city. It is one cap for the whole state; cities like Seattle add notice and relocation rules on top, not different caps.
Certain properties are exempt under RCW 59.18.710, including buildings whose first certificate of occupancy is 12 or fewer years old, public and nonprofit affordable housing, owner-occupied homes where the tenant shares a kitchen or bathroom, owner-occupied single-family properties renting no more than two units or bedrooms (including an ADU or DADU), and owner-occupied duplexes, triplexes, and fourplexes. The exemptions are unavailable if the owner is a corporation, a real estate investment trust, or an LLC with a corporate member. And if you claim an exemption, the rent increase notice must state the facts supporting it; an exempt property with a silent notice is still out of compliance.
A rent increase notice in Washington is not a freeform letter. RCW 59.18.720 prescribes a specific form, and your notice must be substantially the same. The form states the percentage and dollar amount of the increase and the new total, requires you to check whether the increase is below the maximum, at the maximum, or authorized by an exemption, and includes an exemption section where supporting facts must be certified. Certain income-based subsidized tenancies are excused from the form, but most rentals are not.
Service is governed by RCW 59.12.040, the same statute that controls eviction notice service. The statute gives three methods, in order of preference:
The mailing rules changed this very week. Effective June 11, 2026, HB 2664 removed the certified mail requirement from RCW 59.12.040; the copy you mail under the substitute service and post-and-mail methods may now go by regular first class mail, a change confirmed by Washington Law Help's 2026 summary. Certified mail was never a blanket requirement for all notices, and it is not one now.
One timing rule survives: whenever service involves mailing, the law allows five additional days before action can be taken based on the notice. Build five extra days into any timeline that relies on a mailed copy. And whatever method you use, document it: a declaration of service, a timestamped photo, and a copy in the file. Documentation is what wins the argument if a notice is ever challenged, which is why it sits at the center of our Washington landlord tenant law compliance guide.
Seattle layers two significant requirements on top of state law. First, all housing cost increases inside city limits require a minimum of 180 days advance written notice, the notice must include the city's required Renting in Seattle helpline language, and it must take effect at the start of a rental period. Second, under the Economic Displacement Relocation Assistance program (EDRA), an increase that reaches 10% or more within a 12-month period, alone or cumulatively, requires an attached EDRA notice; income-qualified tenants who move out after such an increase can claim relocation assistance of up to three months of housing costs, which the city pays and then bills back to the owner. The 2026 statewide cap of 9.683% sits below that 10% trigger, but cap-exempt properties raising rent 10% or more in Seattle should plan for EDRA exposure. Verify current details on seattle.gov before serving any Seattle notice.
The enforcement teeth in RCW 59.18.700 are real. A tenant facing an increase above the cap may demand in writing that you reduce it, and may terminate the rental agreement with at least 20 days notice before the increase takes effect, with no fines or fees. A tenant or the attorney general can sue, and a court that finds a violation must award the excess rent paid, damages of up to three months of the unlawful rent or fees, and attorney fees and costs. The attorney general can additionally seek civil penalties of up to $7,500 per violation. You also may not report a tenant to a screening service for refusing to pay the unlawful portion of an increase.
Ending a tenancy outside the rules carries its own price: a landlord who removes a tenant in violation of RCW 59.18.650 is liable for wrongful eviction, with damages of up to three times the monthly rent plus attorney fees. If a tenancy needs to end for cause, follow the statute precisely; our guide to the eviction process in Washington State covers each ground and its notice period.
Here is the calendar we run for owners, counting backward from the lease end date:
No. RCW 59.18.650 contains no renewal offer requirement and no service window. A fixed term lease rolls to month to month at expiration unless the landlord qualifies to end the tenancy and serves at least 60 days written notice before the term ends. You may send a renewal offer as early as you like; the only fixed deadline is the 30 day proffer rule described above.
No. Under RCW 59.12.040, handing the notice to the tenant personally is complete service on its own. Mailing a copy is required only with substitute service or post and mail, and as of June 11, 2026, that copy may be sent by regular first class mail. Many professional managers still document every service with a declaration and photos as a best practice.
A minimum of 90 days written notice statewide, and the increase cannot take effect before the current lease term is complete. Income-based subsidized tenancies require 30 days. Seattle requires 180 days for any housing cost increase inside city limits. Other cities set their own tiers: Kirkland, Kenmore, and Shoreline require 120 to 180 days depending on the increase, and Auburn requires 120 days above 5 percent. Check the city every time.
The tenancy automatically becomes month to month on the same terms. If you served a compliant 90 day rent increase notice effective at the end of the term, the new rent applies to that month-to-month tenancy. Remember the parity rule: the month-to-month rent may not exceed comparable fixed term rent for the unit by more than 5%.
Yes. The cap in RCW 59.18.700 limits increases within an existing tenancy. Once a tenant vacates and the tenancy ends, you may set the next rent at market without restriction.
This article is general information for Washington rental property owners, not legal advice. For decisions about a specific tenancy or dispute, consult a landlord-tenant attorney.
Related Sagareus Services:
Washington State eviction process for landlords. Required notices, timelines, court procedures, costs, and legal requirements under RCW 59.12 and RCW...
Step-by-step tenant screening guide for Washington State landlords. Credit checks, income verification, rental history, criminal background, and Fair...
Washington State tenant rights during eviction. Notice requirements, legal protections, unlawful eviction actions, and how to respond under RCW 59.18.