Own rental property in Seattle? Then the state’s 90-day notice requirement for rent increases isn’t enough for you. Seattle requires a full 180 days—six months—before any rent increase can take effect. And that’s just the beginning of Seattle’s additional requirements.

This guide explains Seattle’s extended notice period, the relocation assistance requirements that can cost thousands, and the specific language your notices must contain.

Why Seattle Is Different

Seattle has historically been at the forefront of tenant protection laws in Washington. While state law now requires 90 days’ notice for rent increases, Seattle’s municipal code mandates 180 days. When state and local requirements conflict, landlords must follow the stricter rule—which in Seattle means the six-month notice period.

This extended timeline fundamentally changes how Seattle landlords must plan rent increases. You’re essentially predicting market conditions half a year in advance. A rent increase you want to take effect in January 2026 must be noticed by July 2025.

The Relocation Assistance Trigger

Seattle’s most significant—and costly—requirement involves relocation assistance. If you raise rent by 10% or more, you may be required to pay your tenant up to three months’ rent to help them relocate.

Let’s put this in perspective. If monthly rent is $2,500 and you implement a 10% increase, the potential relocation assistance obligation is $7,500. That $250 monthly increase suddenly has a significant upfront cost that takes 30 months to recover.

This creates strategic implications for pricing. Some landlords choose to keep increases just below 10% to avoid triggering relocation assistance. Others accept the cost for properties that have fallen significantly below market rate. The right approach depends on your specific situation, current rent levels, and long-term investment strategy.

What Counts Toward the 10% Threshold

Seattle’s relocation assistance requirement applies to any increase in “housing costs,” not just base rent. This includes increases in parking fees, storage fees, and potentially other recurring charges.

This broader definition catches landlords who try to avoid the 10% threshold by keeping rent increases low while raising ancillary fees. If combined increases hit 10%, relocation assistance may still be triggered.

Required Notice Language

Seattle rent increase notices must include specific language about tenant rights under city law. Generic notices that only reference state requirements are insufficient and may be unenforceable.

The required information includes notification of Seattle’s 180-day requirement, information about relocation assistance if the increase is 10% or more, resources for tenant assistance programs, and contact information for city agencies. Using incorrect or incomplete forms creates risk even if you otherwise follow proper procedures.

Coordinating Seattle Properties with Others

Many investors in the Puget Sound region own properties in multiple jurisdictions—perhaps one unit in Seattle, another in Bellevue, and a third in Everett. Each location has different requirements.

Managing this complexity requires careful tracking. Your Seattle property needs 180 days’ notice. Your Kirkland property might need 120 days. Your Snohomish County property follows the state’s 90-day rule. One-size-fits-all approaches don’t work when regulations vary by location.

Expert Seattle Property Management

Managing Seattle rental properties requires specialized knowledge of city ordinances that go well beyond state law. At inTrust Property Management, we maintain expertise in Seattle’s unique requirements and help landlords maximize returns while remaining fully compliant.

Our Seattle property management services include accurate calculation of notice periods, preparation of city-compliant notice documents, relocation assistance analysis and planning, coordination with other jurisdictions for multi-property portfolios, and strategic rent increase timing.

Managing Seattle properties is complex. Let us help. Visit intrustpmc.com or call 425-438-3474 to discuss your Seattle rental