Washington Rent Increase Laws in 2026: What Landlords Must Know About HB 1217

Washington State now has a rent increase cap. House Bill 1217, signed into law on May 7, 2025, fundamentally changed the rules for landlords across the state — and many property owners still don't know the details.

For 2026, the maximum allowable rent increase is 9.683% (7% base + CPI adjustment, capped at 10%). Seattle adds its own layer with longer notice periods and additional protections. Here's the complete guide to staying compliant.

HB 1217: Washington's Rent Increase Cap

How the Cap Works

HB 1217 (codified in RCW 59.18.700) limits annual rent increases to 7% plus the consumer price index (CPI) change, with an absolute maximum of 10%. The Department of Commerce publishes the exact cap each year.

For 2026: The cap is 9.683% (7% + 2.683% CPI).

Key details:

• The cap applies to all residential rental properties covered by the Residential Landlord-Tenant Act
• Increases are measured on a 12-month rolling basis — you cannot raise rent more than the cap amount in any 12-month period
• The cap resets each calendar year based on the new CPI calculation
• Unused cap does not carry forward — the cap is calculated fresh each year based on the current CPI. If you raise rent by only 3% this year, the unused capacity does not carry over. Next year's maximum is still based on next year's published cap, not accumulated unused increases.

What's Exempt?

HB 1217 includes several exemptions under RCW 59.18.710. The cap does not apply to:

• New construction (first 12 years after certificate of occupancy)
• Subsidized housing where rents are set by a government agency
• Owner-occupied properties (three categories):
  • A dwelling unit where the owner shares a bathroom or kitchen with the tenant
  • An owner-occupied single-family home where the owner rents no more than two units or bedrooms (including ADUs/DADUs)
  • An owner-occupied duplex, triplex, or fourplex where the owner lives in one unit

Critical: All owner-occupied exemptions require the owner to actually live on-site. Properties owned by REITs or corporate LLCs do not qualify (RCW 59.18.710(2)). And there is no portfolio-size exemption — owning only one or two rental properties does not exempt you if you don't live in the building.

Important: The exemptions are narrower than many landlords assume. If you own rental properties through an LLC — which is common for liability protection — you do not qualify for the owner-occupied exemptions even if you live on-site.

Sunset Provision

HB 1217 includes a sunset clause. Both RCW 59.18.700 and RCW 59.18.710 expire on July 1, 2040. That's over 14 years of runway — landlords should plan their investment strategies around the cap being in effect for the foreseeable future.

Notice Requirements

Washington State (RCW 59.18.140)

Washington requires written notice at least 90 days before a rent increase takes effect. This applies statewide, regardless of the amount of the increase.

The notice must:

• Be in writing and served per RCW 59.12.040: personal delivery or posting on the premises plus first-class mail
• State the new rent amount
• State the effective date of the increase
• Be delivered at least 90 days before the effective date

⚠️ Email does not comply. Written notice must be served by personal delivery to the tenant, or by posting on the premises plus mailing via first-class mail (RCW 59.12.040). Email alone does not satisfy the notice requirement, even if your lease allows electronic communication for other purposes.

Seattle (SMC 7.24.030)

Seattle requires 180 days' written notice for any rent increase — twice the state minimum. This is one of the longest notice periods in the country.

This means: If you want a rent increase effective January 1, you must deliver notice by early July at the latest. Missing the window means delaying the increase by at least a month.

First-Tenancy Protection

Under HB 1217, landlords cannot raise rent during the first 12 months of a tenancy. The first increase can only take effect after the initial lease term expires plus the required notice period.

Example: If a tenant signs a 12-month lease starting April 1, 2026, the earliest a rent increase can take effect is July 1, 2027 (12 months + 90 days notice for state; 12 months + 180 days for Seattle).

Calculating Your Maximum Increase

Here's the step-by-step process:

1. Find the current cap: Check the WA Department of Commerce website for the current year's maximum (9.683% for 2026)
2. Calculate the dollar amount: Current rent × cap percentage = maximum increase
3. Verify 12-month lookback: Confirm no other increases were applied in the previous 12 months
4. Check local rules: Seattle and other municipalities may have additional restrictions
5. Calculate notice deadline: Count back 90 days (state) or 180 days (Seattle) from your target effective date

Example calculation:

• Current rent: $2,500/month
• 2026 cap: 9.683%
• Maximum increase: $2,500 × 0.09683 = $242.08
• Maximum new rent: $2,742.08
• If in Seattle, notice must be delivered 180 days before the effective date

Penalties for Noncompliance

Violating HB 1217's rent cap or notice requirements can result in:

• Tenant right to recover excess rent paid above the cap
• Penalties of up to three months of the unlawful rent increase amount for knowing violations (RCW 59.18.700(5)(a)) — this is three months of the excess amount, not three months of total rent
• Attorney fees and costs awarded to prevailing tenants
• AG enforcement: The WA Attorney General can impose penalties of up to $7,500 per violation (RCW 59.18.700(5)(b)) and has explicit enforcement authority under HB 1217

Tenant cure demand: Before filing suit, tenants must first provide written notice demanding the landlord cure the violation (RCW 59.18.700(3)). This gives landlords a chance to correct the rent amount and refund overcharges before facing penalties — but only if they respond promptly.

Courts take these violations seriously. A landlord who raises rent by 12% when the cap is 9.683% doesn't just owe the 2.317% difference — they face statutory penalties and potential AG action.

Common Mistakes

1. Ignoring the 12-Month Rolling Period

The cap isn't per-increase — it's per 12-month period. Two separate 6% increases within 12 months total 12%, which exceeds the cap even though each individual increase is below it.

2. Assuming LLC Ownership Qualifies for Exemptions

Many landlords hold properties in LLCs for liability protection. Under HB 1217, LLC-owned properties do not qualify for the owner-occupied exemptions — all exemptions require ownership by a "natural person," not a corporate entity (RCW 59.18.710(2)).

3. Using State Notice Periods in Seattle

90 days is the state minimum. Seattle requires 180. Sending a 90-day notice for a Seattle property means the increase is invalid — you'll need to reissue with the correct timeline, delaying the increase by months.

4. Raising Rent During the First Year

HB 1217 prohibits rent increases during the first 12 months of a tenancy. This applies even if the initial rent was set below market — you must wait until after the first year plus the notice period.

5. Not Tracking CPI Changes Annually

The cap changes every year with CPI. Using last year's cap (or guessing) can result in an over-limit increase. Check the Department of Commerce publication each January.

6. Ignoring the Rental Parity Rule

Under RCW 59.18.700(4)(b), landlords cannot charge more than a 5% difference between month-to-month and fixed-term lease rates for the same unit. This prevents using lease-type pricing as a way to circumvent the rent cap. If your fixed-term rent is $2,500, your month-to-month rate for the same unit cannot exceed $2,625.

How Professional Management Helps

Rent increase compliance requires tracking multiple overlapping rules — state caps, local notice periods, 12-month lookback windows, first-tenancy protections, and exemption qualifications. Missing any one of these creates legal exposure.

At PPM NW, we handle the full rent increase cycle:

• Annual cap tracking — we monitor the Department of Commerce publication and calculate maximum increases for each property
• Notice automation — properly formatted notices delivered within the required timeframe (90-day state minimum or 180-day Seattle requirement)
• 12-month lookback verification — ensures no rolling-period violations
• Exemption analysis — determines whether your property qualifies for any HB 1217 exemptions based on ownership structure and property type
• Seattle layering — manages the additional requirements for Seattle properties

For more on Washington landlord compliance, see our complete Washington Landlord Compliance Guide for 2026, which covers HB 1217 alongside security deposits, habitability standards, and eviction procedures. If you're managing properties from out of state, our Out-of-State Landlord Guide covers the additional challenges of remote management. And for security deposit rules specifically, see our Washington Security Deposit Laws Guide.

Key Takeaways

Requirement	State (RCW 59.18)	Seattle (SMC 7.24)
Rent cap (2026)	9.683% (7% + CPI, max 10%)	Same cap applies
Notice period	90 days written	180 days written
First-year protection	No increases first 12 months	Same
Cap measurement	12-month rolling period	Same
Penalty for violation	Up to 3 months of excess rent + attorney fees; AG up to $7,500/violation	Same + local enforcement
Rental parity	≤5% difference between M2M and fixed-term for same unit	Same
Sunset	July 1, 2040	N/A (Seattle rules are separate)

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PPM NW LLC (Firm License #26000662) manages residential properties across the Seattle metro area with a focus on full regulatory compliance. Questions about rent increase rules for your rental property? Contact us — (206) 338-4008.