Washington HB 1217 Rent Cap: 7% & CPI Formula Compliance Guide (2026)

What Is HB 1217 and Why It Matters to Your Bottom Line

On June 12, 2023, Washington Governor Jay Inslee signed HB 1217 into law, establishing the first statewide rent control measure in Washington history. Effective January 1, 2026, this statute fundamentally restricts how much rent you can increase annually—even if your lease allows higher increases and even if the market demands it.

For self-managing landlords with 2–75 units, this is not optional guidance. It is mandatory law. Violations trigger significant financial exposure: treble damages (three times the overcharged rent), attorney fees paid by the landlord, and potential tenant counterclaims in eviction proceedings.

The statute appears in RCW 59.18.140, titled “Rent increases.” Understanding its mechanics—the 7% cap, the CPI formula alternative, exemptions, and notice requirements—is the difference between a clean rent increase and a lawsuit that costs tens of thousands to defend.

The 7% Hard Cap: The Starting Line for All Increases

The Basic Rule Under RCW 59.18.140(1)

Beginning January 1, 2026, a landlord cannot increase rent more than 7% per 12-month period. This is a hard ceiling. It applies to:

• Month-to-month tenancies
• Fixed-term leases at renewal
• Lease modifications during a tenancy (if allowed by the lease)
• All residential properties in Washington (with narrow exemptions noted below)

The 7% is calculated on the rent charged at the start of the 12-month period. If you charged $1,000/month on January 1, 2026, the maximum rent on January 1, 2027 is $1,070/month (7% of $1,000 = $70). If you attempt to increase to $1,100/month, you have violated the statute.

This applies regardless of what your lease says. If your lease contains language allowing increases tied to the CPI, the lease consumer price index, or market rates, those provisions are now superseded by statute. The law overrides contract terms that exceed the caps.

The CPI-U Alternative After Year One

RCW 59.18.140(2) allows a different calculation method starting after the first 12 months of tenancy:

“After the first year of tenancy, a landlord may increase the rent in an amount up to the greater of: (a) Three percent; or (b) The percentage increase in the Consumer Price Index for all urban consumers (CPI-U) for the Seattle metropolitan area for the 12 months prior to the date the increase takes effect. The cumulative increase shall not exceed seven percent.”

In plain language: you calculate rent increases using whichever is higher—3% or the Seattle CPI-U increase from the prior 12 months—but capped at 7% total.

Example: On January 1, 2027 (the second year of a tenancy that began January 1, 2026), you may increase rent by the greater of:

• 3%, or
• The CPI-U increase for the Seattle metro area from January 2026 to January 2027

If the Seattle CPI-U increased 4.2% during that 12-month window, you may increase rent by 4.2% (but not more than 7%). If CPI-U only rose 2%, you use the 3% floor.

The Seattle-Tacoma-Bellevue metropolitan area CPI-U is the official metric. The U.S. Bureau of Labor Statistics publishes this monthly. You must use the official BLS figure for your calculation date, not estimates or projections.

The Cumulative Cap of 7%

Even when using the CPI-U method, the total increase cannot exceed 7%. This means:

• If CPI-U rose 6.5%, your increase is capped at 7%.
• If you granted a partial increase (e.g., 3.5% after year one), and CPI-U rises 4% in year three, you cannot compound increases beyond 7% in any single 12-month period.

This is a per-period cap, not a cumulative lifetime cap. Each 12-month rent-increase window resets and allows up to 7% increase (or 3%/CPI-U, whichever is greater, after year one).

Notice Requirements: The 60-Day Trigger

Mandatory 60-Day Written Notice

RCW 59.18.140(4) requires that you provide written notice at least 60 days before the effective date of a rent increase.

Critical compliance points:

• It must be written. Verbal notice, email, or text messages may not satisfy the statute, depending on your lease and Washington case law standards. Use certified mail, email with read receipt, or hand delivery with a signed receipt.
• 60 days is the minimum. If you provide 59 days’ notice, the increase is void and you cannot collect the additional rent. The tenant may withhold it, and you have no legal right to pursue it.
• The clock starts the day you deliver notice. If you mail notice on January 1, the effective date cannot be earlier than March 1 (60 days later).
• All tenants must receive notice. If the lease is in two names or there are co-tenants, each must receive notice at the address on the lease or as required by your lease terms.

Notice Content Requirements

The statute does not prescribe exact wording, but your notice should clearly state:

• Current rent amount
• New rent amount
• Effective date (at least 60 days in the future)
• The rental period to which the new amount applies

Best practice: include a statement that the increase complies with RCW 59.18.140 and cite the applicable cap (7%, or the CPI-U method if applicable). This creates a contemporaneous record of your compliance intent.

Failure to Provide 60-Day Notice: Consequences

If you fail to provide 60 days’ notice, the rent increase is void. The tenant is not obligated to pay the increased amount. If you attempt to collect it, you face:

• Tenant offset (withholding rent) as a defense in an eviction for nonpayment
• Tenant counterclaim for damages under RCW 59.18.150
• Attorney fees and costs if tenant prevails

There is no grace period and no “substantial compliance” doctrine in Washington statute law for rent-increase notices. The requirement is strict.

Exemptions: When HB 1217 Does Not Apply

New Construction Exemption (RCW 59.18.140(3))

Rent increases are not capped for the first five years after substantial completion of a building or unit. “Substantial completion” is the date the unit is first inhabited, not when construction began.

Requirements to qualify:

• The building or unit must be new (not a conversion of existing space, generally)
• The unit has never been occupied as a residential rental before
• You must track the five-year window carefully; the exemption expires on the fifth anniversary of first occupancy
• After five years, all caps apply retroactively—you cannot charge uncapped rent for years 1–5 and then try to “catch up” in year 6

If a unit was completed and first rented January 1, 2020, the exemption expires January 1, 2025—before HB 1217 takes effect. Beginning January 1, 2026, that unit is subject to the 7% cap and CPI-U alternative, even if five years have not passed since you completed construction.

Beware: claiming the exemption falsely—by misrepresenting a renovated unit as “new construction”—can trigger damages claims and agency enforcement. Document first-occupancy dates and construction completion dates with contemporaneous records.

Capital Improvement Pass-Through (Limited and Rare)

Washington law allows landlords to recover certain capital improvement costs through rent increases, but RCW 59.18.140 does not explicitly carve out a capital improvement exemption from the 7% cap. Some jurisdictions (e.g., California, Oregon) allow separate pass-throughs; Washington is narrower.

Consult a Washington landlord-tenant attorney before assuming you can increase rent above the 7% cap to recover a major retrofit, roof replacement, or seismic upgrades. The statute’s text does not provide clear authorization, and court interpretation remains developing.

No Exemption for Market Rate, Eviction History, or Unit Condition

The statute provides no exemptions based on:

• Local market rent (rent in the area may be higher; you are capped at 7%)
• Prior lease violations by the tenant
• The condition of the unit or building
• Increased operating costs, property taxes, or insurance

These are the tradeoffs of rent control. You cannot price-adjust for market demand or cost increases beyond the statutory caps.

Calculating Your Rent Increase: Step-by-Step Compliance Checklist

Step 1: Identify the Tenancy Start Date and Current Rent

Information	Where to Find It
Lease start date	Original lease or move-in addendum
Current rent (as of increase date)	Most recent lease, rent ledger, or lease amendment
Payment frequency (monthly, weekly)	Lease or rent payment records

Step 2: Determine Which Increase Method Applies

If first year of tenancy (months 1–12): Use the 7% cap only. The CPI-U method does not apply yet.

If after first year: Calculate both 3% and the Seattle CPI-U increase, use the greater, capped at 7%.

Step 3: Obtain the Official Seattle CPI-U Figure

Visit the U.S. Bureau of Labor Statistics website (bls.gov) and find the Consumer Price Index for All Urban Consumers (CPI-U) for the Seattle-Tacoma-Bellevue area. Use the 12-month change ending in the month before your notice date.

Example calculation for January 1, 2027 increase:

• Look up Seattle CPI-U for December 2026 and December 2025
• Calculate percentage change: (December 2026 index − December 2025 index) ÷ December 2025 index × 100
• Compare to 3%; use the greater figure
• Cap at 7%

Do not use: national CPI-U, regional CPI estimates, or real estate price indices. The statute specifies Seattle metro CPI-U only.

Step 4: Calculate New Rent

Year 1 example: Current rent $1,200/month × 1.07 (7%) = $1,284/month (maximum).

Year 2+ example: If Seattle CPI-U rose 4.1% (greater than 3%), new rent = $1,284 × 1.041 = $1,336.74/month (capped at 7% = $1,373.88/month).

Step 5: Prepare and Deliver 60-Day Notice

Draft a written notice containing:

• Tenant name(s) exactly as on lease
• Property address
• Current rent and new rent (both dollar amounts)
• Effective date (at least 60 days from notice date)
• Rental period (e.g., “for the month of March 2027 and each month thereafter”)
• Date you deliver notice
• Your signature

Deliver via certified mail with return receipt, email with read receipt and confirmation of tenant receipt, or hand delivery with a dated receipt signed by tenant.

Step 6: Document and File

Keep in your lease file:

• Copy of notice delivered
• Proof of delivery (certified mail receipt, email read receipt, signed hand-delivery receipt)
• Lease document with original start date
• Printed BLS CPI-U figure and calculation worksheet (if using CPI-U method)
• Rent ledger showing prior amounts and new amount

This documentation is your defense if a tenant disputes the increase or if you are audited by a housing authority.

Penalties and Enforcement: What You Risk

Treble Damages and Attorney Fees (RCW 59.18.150)

If you violate RCW 59.18.140 by charging rent above the caps or failing to provide proper notice, the tenant can sue under RCW 59.18.150:

“If a landlord violates RCW 59.18.140, the tenant may recover the difference between the rent paid and the rent that should have been charged, plus treble damages and reasonable attorney fees and court costs.”

This means:

• Overcharged rent: If you charged $1,100/month but the cap was $1,070/month, the tenant recovers the $30/month overage for every month it was charged.
• Treble damages: The $30/month × 12 months = $360 overcharge becomes $360 × 3 = $1,080.
• Attorney fees: The tenant’s attorney fees to bring the claim are paid by you, potentially $2,000–$5,000+ depending on case complexity.

Scenario: You increased a tenant’s rent from $1,200 to $1,150 (8.3% increase instead of 7%) without 60 days’ notice. The tenant pays under protest for 12 months ($1,750 extra rent paid), then sues.

• Overcharge: $1,750
• Treble damages: $1,750 × 3 = $5,250
• Attorney fees: $3,000
• Total liability: $9,250

The tenant may raise this claim as a counterclaim in an eviction for nonpayment, reducing or eliminating what you can collect.

Washington State Attorney General and Local Housing Enforcement

The Washington Attorney General’s Office and local housing authorities (in cities like Seattle, Tacoma, and Spokane) enforce RCW 59.18.140. While enforcement against individual landlords is not aggressive yet, the statute creates a private right of action and authorities may investigate complaints, especially if a pattern emerges.

Violations can also trigger:

• Cease-and-desist orders
• Restitution orders requiring you to repay overcharged rent to affected tenants
• Public proceedings and licensing consequences (if you hold a property management license)

Defenses You Do Not Have

Washington courts will not accept these arguments:

• “I did not know about HB 1217.” (Ignorance is not a defense.)
• “The market rent is higher.” (Market conditions do not override statute.)
• “My costs increased.” (Operating cost increases do not create an exemption.)
• “The tenant agreed verbally to a higher increase.” (Oral waivers of statutory rights are generally void.)

The only valid defenses are proper notice, compliance with caps, and narrow exemptions (new construction, etc.).

Special Situations and Edge Cases

Lease Renewals vs. Lease Continuations

The statute applies equally whether you are renewing a lease (tenant moves out, new lease executed) or continuing tenancy (month-to-month or lease term extending). In both cases, you must provide 60 days’ notice and comply with caps.

If a tenant’s one-year fixed lease expires December 31, 2026, and you want to increase rent for the renewal beginning January 1, 2027, you must provide notice by November 1, 2026 (60 days prior).

Mid-Lease Increases (Variable Rent Provisions)

Some leases allow rent increases during the term (e.g., annual adjustments tied to CPI). These are now subject to the HB 1217 caps. If your lease says “rent shall increase by the full CPI-U on each anniversary,” that provision is superseded: increases are capped at 7% (or 3%/CPI-U after year one, whichever is greater, capped at 7%).

Update your lease template to conform to RCW 59.18.140 for all new leases and clearly state that increases are subject to statutory limits.

Multiple Rent Increases in One 12-Month Period

You cannot circumvent the 7% cap by increasing rent twice in one 12-month period. The statute defines the cap as “per 12-month period.” If you increase rent on January 1, 2026 by 3.5%, you cannot increase again on July 1, 2026 by another 3.5% for a total of 7%. The second increase would violate the cap in that 12-month window.

You may increase once per 12-month period, at any frequency you choose (monthly, annually), but the total increase in any 12 consecutive months cannot exceed the cap.

Rent Decreases and Below-Minimum Increases

If you decrease rent or increase by less than the statutory cap, you are not in violation. The statute sets a ceiling, not a floor. You can increase by 2%, 0%, or offer a decrease without penalty. However, once you set a new rent amount, the next increase calculation is based on that new amount.

Practical Tools: Compliance with LeaseBase

Self-managing landlords face a dual challenge: understanding the law and executing it consistently across multiple units and lease cycles. The stakes are high—one missed 60-day notice or miscalculated increase can expose you to treble damages and attorney fees.

Compliance platforms can automate much of this work. A dedicated lease operations tool allows you to:

• Track lease start dates and tenancy anniversaries for each unit
• Calculate maximum allowable increases based on the 7% cap and CPI-U formula
• Generate compliant 60-day notice templates with the correct effective dates
• Log and archive notices, delivery receipts, and calculations
• Alert you when the 60-day window is approaching

Integrated compliance checks can flag potential violations before you issue a notice, reducing your risk of accidental non-compliance. For a portfolio of 20+ units, this automation is the difference between manual error-prone spreadsheets and systematic, auditable compliance.

Frequently Asked Questions

Q1: Does HB 1217 apply to my single-family rental or duplex?

A: Yes. RCW 59.18.140 applies to all residential rentals in Washington, including single-family homes, duplexes, and apartment buildings. The statute does not have a unit-count threshold. The only exemptions are narrow: new construction (first five years) and possibly certain capital improvement pass-throughs (rare and legally uncertain).

Q2: If my lease was signed before 2026, do I have to comply with HB 1217 starting January 1, 2026?

A: Yes. The statute is retroactive to all leases and tenancies, regardless of when they were signed. Once January 1, 2026 arrives, every rent increase you attempt to charge is subject to the 7% cap and notice requirements. Update your lease language to reflect the caps and ensure all new leases signed in 2025 and beyond reference compliance with RCW 59.18.140.

Q3: What if my tenant and I agreed verbally that I could increase rent by 10% if they renewed their lease?

A: Oral agreements cannot override statute. Even if the tenant agreed, you cannot legally charge more than 7% in year one (or the applicable CPI-U cap after year one). Any attempt to collect the overage exposes you to treble damages, attorney fees, and an offset defense in an eviction. Put everything in writing that complies with the statute.

Q4: How do I get the official CPI-U figure for the Seattle area?

A: Visit the U.S. Bureau of Labor Statistics website (bls.gov), navigate to the CPI database, and select “Seattle-Tacoma-Bellevue” as the metropolitan area. Look for the 12-month percentage change for “All Items.” This is the official metric cited in RCW 59.18.140(2). Do not use estimates, third-party indices, or national averages.

Q5: Can I use the CPI-U method in year 1, or only after year 1?

A: You must use the 7% cap for year 1 (the first 12 months of tenancy). The CPI-U method (greater of 3% or CPI-U, capped at 7%) applies only after the first 12 months. If a tenant’s lease began January 1, 2026, you cannot use the CPI-U method until January 1, 2027.

Key Dates and Deadlines for 2026–2027

Date	Event / Requirement
January 1, 2026	HB 1217 takes effect; 7% cap applies to all rent increases
January 1, 2026 – March 1, 2026	If you provide 60-day notice by January 1, earliest effective date is March 1
December 1, 2026	Deadline to issue 60-day notice for January 1, 2027 increases (for tenancies beginning Jan 1, 2026)
January 1, 2027	CPI-U alternative method becomes available for tenancies in their second year
Ongoing (monthly)	BLS releases updated Seattle CPI-U data; use this for CPI-U increase calculations

Conclusion: Compliance Is Non-Negotiable

HB 1217 represents a fundamental shift in Washington’s rental market. The 7% cap and CPI-U alternative are now law, and the penalties for non-compliance are substantial: treble damages, attorney fees, and counterclaims in evictions.

For self-managing landlords, the path forward is straightforward:

• Know the law: Understand the 7% cap, the CPI-U alternative, and the 60-day notice requirement.
• Calculate correctly: Use BLS official data, track tenancy start dates, and maintain contemporaneous calculation records.
• Document everything: Keep copies of notices, delivery receipts, leases, and calculations in your file.
• Automate where possible: Use compliance tools to reduce manual error and ensure consistent application across your portfolio.

Do not assume you can negotiate, get verbal consent, or rely on outdated lease language. Statute overrides contract, and courts will not entertain defenses based on cost increases, market conditions, or tenant agreement to higher increases.

If you manage 2 units or 75 units, HB 1217 compliance is a core operational requirement as of January 1, 2026. Treat it accordingly.

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Disclaimer: This article is for informational purposes only and does not constitute legal advice. Consult a qualified Washington landlord-tenant attorney for guidance specific to your situation, lease structure, or property portfolio.