Washington Rent Increase Calculator 2026
How much can rent increase in Washington? Enter the current and proposed rent, then review the applicable statewide rule, notice baseline, exemptions, local-rule checks and official source before serving a notice.
For 2026, use Washington Commerce's published annual maximum of 9.683% for covered residential properties rather than entering a manual CPI value.
Washington rent increase quick answer
Rule: A statewide formula or published cap may apply to covered rentals.
Who it applies to: Coverage depends on the property, tenancy type, lease terms, exemptions and any local ordinance or regulated-housing program.
Notice requirement: 90 days is the current baseline for the sample inputs; tenancy and local law can change it.
Last verified: 2026-09-13
Official source: Linked below.
Washington rent increase rule
For covered residential tenancies, Washington's published maximum annual rent increase for calendar year 2026 is 9.683%. Rent generally may not be increased during the first 12 months of a tenancy, and ordinary residential increases require at least 90 days' prior written notice. Statutory exemptions, subsidized-tenancy rules, and property-specific requirements still require review.
Reference: RCW 59.18.140 / 59.18.700–.720
Source verified: 2026-09-13 · This primary source governs the state-level rule record used by connected Max Rental Tools workflows.
Official government source Editorial & verification policyConnected Washington rental tools
This guide is connected to the same dependency graph used by the calculator, rent-increase notice/PDF workflow, related articles, local guides and translated document pages. A verified rule change can therefore be traced to every downstream surface that may require review.
Common Washington rent increase questions
How much can a landlord raise rent in Washington?
A statewide formula may apply to covered properties. Exemptions, CPI inputs and local rules can change the final result, so verify the current official source before acting.
How much notice is required for a rent increase in Washington?
The calculator currently shows a baseline of 90 days for the sample inputs. Tenancy length, increase size, lease terms and local law can require a different period.
Can a landlord raise rent during a lease in Washington?
A fixed-term lease can restrict when rent changes take effect. Review the lease plus current state and local law before serving a notice.