Washington Rent Increase Laws

Washington’s adoption of House Bill 1217 marks a major shift in statewide rental rules. The law created a new rent-control system and expands tenants’ rights. It also adds obligations for housing providers that affect nearly every tenancy. Both landlords and tenants will need to understand how this new rent stabilization law works, when it applies, and when it doesn’t.

This guide covers Washington’s new law and key provisions for landlords and tenants. We break down the rent cap itself, notice requirements, and the new lease-parity rule. We’ll also review tenant protections and answer commonly asked questions.

If you’re facing challenges related to current landlord/tenant obligations, consider speaking with a lawyer. A landlord-tenant attorney licensed in Washington can help you determine whether you’re facing a potential violation. They can also help you understand your options and available remedies.

In the meantime, let’s start by reviewing some of the major ways HB 1217 reshapes Washington’s rental landscape.

The Statewide Rent Cap

Washington now limits how much residential rent can rise each year. This rent cap is the centerpiece of HB 1217, and it affects most tenancies across the state. In this section, we explore HB 1217’s rent cap rules, which apply equally to fixed‑term leases and month‑to‑month tenancies.

How the Rent Cap Works

The rent cap under HB 1217 restricts residential rent increases in a few key ways. Specifically, it:

• Prohibits rent increases in the first 12 months of a tenancy
• Allows increases (after the first year) no more than once every 12 months, up to the maximum allowed percentage

This maximum is the lower of two numbers: 7% plus the annual change in the Consumer Price Index (CPI), or a flat statutory cap of 10%.

The 2026 maximum is 9.683%. This means landlords can’t increase rent by more than that amount for the calendar year.

Calculating the Maximum Increase

The Washington State Department of Commerce publishes the maximum allowed residential rent increase percentage each July. Tying the maximum increase formula to inflation helps ensure that the rent cap adjusts with economic conditions. If inflation rises sharply, the maximum may approach the 10% statutory cap. If inflation remains low, the maximum may be closer to 7%. The Department of Commerce maintains a statewide Landlord Resource Center with guidance, calculators, and compliance tools.

The Rent Cap in Practice

Let’s say a tenant has been in a rental for over a year. They pay $2,000 in rent each month. Their landlord can’t raise the monthly rent more than $193.66 (9.683%) in 2026.

The 2027 maximum is set at 10%. Using the same example, where the landlord raised the rent to $2193.66 in 2026, the largest allowable increase to their monthly rent amount in 2027 would be $219.37 (10%).

Manufactured and Mobile Homes

A separate HB 1217 rule addresses manufactured and mobile home communities. It applies to mobile home owners who rent lot space. The rule imposes a stricter, permanent statewide rent cap of 5% annually.

This lower cap recognizes the unique economic vulnerability of mobile home owners. If they are forced to relocate their homes because of steep lot rent increases, these Washingtonians face several hurdles. The cap applies only during an active tenancy. Once a tenant moves out, landlords may set rent at any amount for the next tenant.

Mandatory Written Notice

HB 1217 also strengthens notice requirements for rent hikes. These rules apply whether the rental is under a fixed-term lease or a month-to-month tenancy.

Landlords now have to provide at least 90 days’ written notice before a rent increase. This is the statewide minimum.

The notice must clearly state:

• Amount of the increase
• Date it will take effect
• Whether the unit is exempt from the rent cap

If the landlord claims an exemption, the notice must explain the facts supporting it. This helps tenants understand whether the increase is lawful. Any changes to a rental agreement that affect rent or fees must also follow HB 1217’s notice rules.

Lease Parity

HB 1217’s new lease parity rule prevents sharp price gaps between different lease types for the same unit. Previously, landlords often charged much higher rent for month-to-month arrangements.

The rule now caps that difference at 5%. This means that a month-to-month rental rate can’t exceed a fixed-term lease rate by more than 5% for the same unit. This unusual rule has drawn significant attention from both landlords and tenants.

Tenants’ Rights Under HB 1217

The new law also expands tenant protections under Washington’s Residential Landlord-Tenant Act. These changes give tenants clearer tools to challenge unlawful rent increases and improper fees. Specifically:

• Tenants can dispute rent increases that exceed the cap or violate notice rules
• Tenants may now lawfully terminate a lease early if the landlord imposes an unlawful increase
• Recurring fees are included in the rent figure for rent cap purposes
• Landlords must separate one-time fees, like late fees and security deposits, from rental figures

This makes it difficult for landlords to impose and hide unlawful increases.

Exemptions

Although HB 1217 applies to most residential rentals, several categories are exempt. This means the rent increase cap doesn’t apply to these properties. Landlords must still provide written notice of increases and disclose/explain the exemption in writing.

We explore some main exemptions below.

New Construction

Units built within the last 12 years are exempt if they have a valid certificate of occupancy. This exemption encourages new construction and increases housing supply. Once a building reaches 12 years from its certificate of occupancy, the rent cap applies.

Owner‑Occupied Small Buildings

Some small multi‑unit buildings are exempt, but only under specific conditions. Duplexes, triplexes, and fourplexes are exempt if the owner lives in one of the units and is an individual/couple rather than a business entity. This exemption recognizes that small owner‑occupied buildings operate differently from larger rental properties.

This exemption also applies to owner-occupied single-family homes where the owner rents out no more than two additional units or bedrooms. These only apply if the owner is an individual, not a corporation, a real estate investment trust (REIT), or an LLC with a corporate member.

Affordable Housing

HB 1217 exempts affordable housing properties that operate under separate rules. This includes rentals that are:

• Provided by nonprofit organizations
• Run by public housing authorities
• In buildings with special tax credits

These properties operate under separate regulatory frameworks. For example, certain federally subsidized tenancies calculate rent as a strict percentage of household income and follow specific rent adjustment rules and schedules. Properties with active Low‑Income Housing Tax Credits (LIHTC) operate under their regulatory agreements.

Responsibilities of Housing Providers

Compliance with HB 1217 requires attention to timing, documentation, and lease structure. Landlords, property managers, and other housing providers must follow the new rules carefully and:

• Apply the rent cap unless an exemption clearly applies
• Provide proper written notice
• Adhere to the correct notice period
• Comply with lease‑parity rules
• Observe limits on fees and deposits
• Explain any exemptions claimed

The Attorney General’s Office has enforcement authority. It may investigate complaints and impose penalties under the Consumer Protection Act of up to $7,500 per violation. Tenants whose HB 1217 rights are violated can also bring a private legal action against the housing provider.

Impact on Tenants and Landlords

HB 1217 aims to reduce housing instability caused by sudden rent spikes. For tenants, the law provides more predictable rent, clearer notices, and stronger rights. For landlords, the law introduces new administrative steps and limits on rent increases. It also creates clearer statewide standards that may reduce disputes.

Legal Guidance

Some disputes are inevitable. Many can be resolved through the AG’s office, but some require legal action. If you’re dealing with a conflict, consider touching base with a lawyer before formalizing a report or complaint. The right advocate can be invaluable at this stage.

If you’re like most Washingtonians, you may not have an attorney with the right credentials on standby. FindLaw’s directory of Washington landlord and tenant attorneys can help you get started. This publicly accessible resource compiles ratings, background, and other criteria for experts in your area, including which ones offer free consultations.

Look for landlord-tenant specialists with strong ratings and experience in cases similar to yours, then schedule a consultation. That way, you can move forward confidently and make fully informed decisions.