Washington Annual Rent Increase Ceiling: HB 1217 & CPI-U Calculation Guide (2026)

What Is Washington's Rent Increase Cap and Why Does It Matter?

On January 1, 2019, Washington HB 1217 became law, imposing the state's first statewide rent increase ceiling. For nearly every landlord managing 2–75 units in Washington, this statute is non-negotiable. A rent increase that exceeds the legal cap is unenforceable—and if you attempt collection, you expose yourself to tenant counterclaims for damages.

The legal cap is the lesser of:

• 7 percent of the current rent, or
• CPI-U (Consumer Price Index for All Urban Consumers) for the Seattle-Tacoma-Bremerton metro area, plus 1 percentage point

This is not optional negotiation language. RCW 59.18.140 explicitly states: "No landlord shall increase or attempt to increase the rent in excess of this maximum annual rent increase." Violations trigger RCW 19.86 Unfair Practice Act liability and separate damages under RCW 59.18.140(2).

Many self-managing landlords miss this requirement because they assume a 5–6% increase is "reasonable." Reasonableness is irrelevant. The statute sets the ceiling, and every increase—even a 1% bump—must be documented, calculated, and justified using the official CPI-U figure for your metro area.

Understanding CPI-U and Which Index Applies to You

CPI-U is the Consumer Price Index for All Urban Consumers, a monthly measure published by the U.S. Bureau of Labor Statistics (BLS). It tracks inflation across goods, services, energy, and housing in specific metro areas.

For Washington landlords, the applicable index is the Seattle-Tacoma-Bremerton metropolitan statistical area (MSA), which includes:

• King County
• Pierce County
• Snohomish County
• Thurston County (Olympia area)
• Parts of Kitsap County

If your rental property is within this MSA, you use the Seattle-Tacoma-Bremerton CPI-U. The BLS publishes this data monthly but typically with a 1–2 week lag. For rent increases effective January 1, 2027, you would use the December 2026 CPI-U figure, published in mid-January 2027.

Important: Using a different CPI index (national average, Portland MSA, or Spokane data) is a compliance violation. Tenants' attorneys routinely cross-reference rent increase notices against published BLS data. A calculation error or wrong index selection is discoverable, expensive to defend, and often indefensible in court.

Properties outside the Seattle-Tacoma-Bremerton MSA (e.g., Spokane, Tri-Cities, Yakima) have different CPI-U designations, but HB 1217 applies statewide. Confirm your MSA using the BLS website or contact the Washington State Department of Commerce if you're uncertain.

Step-by-Step Rent Increase Calculation

Here's the compliance process every landlord must follow:

Step 1: Identify the Current Annual Rent

Use the rent the tenant is currently paying, not the rent they paid five years ago or what you think market rate is. If the tenant pays $1,200/month, the annual rent for calculation purposes is $14,400.

If the tenant has already received an increase this year, use the most recent post-increase figure. Do not stack increases within the same 12-month period—HB 1217 limits increases to once per calendar year unless the lease explicitly permits otherwise and complies with separate notice requirements.

Step 2: Obtain the Current CPI-U Figure

Navigate to the Bureau of Labor Statistics website (bls.gov) and locate the latest published CPI-U for the Seattle-Tacoma-Bremerton area. The data is released monthly on the BLS website in the "Average Energy Prices" and "Consumer Price Index" sections.

You need two figures:

• Prior-year CPI-U (same month, previous year)
• Current CPI-U (the month you are calculating the increase for)

For an increase effective January 1, 2027, you would compare the December 2025 CPI-U to the December 2026 CPI-U. The percentage change year-over-year is your CPI-U increase.

Example: December 2025 CPI-U = 340.2; December 2026 CPI-U = 351.0. The year-over-year change is (351.0 – 340.2) ÷ 340.2 = 3.18%.

Step 3: Calculate Both Permitted Amounts

Calculation A (7% cap): Current rent × 0.07

Example: $1,200/month × 0.07 = $84/month increase maximum

Calculation B (CPI-U + 1%): Current rent × (CPI-U % + 1%)

Example: $1,200/month × (3.18% + 1%) = $1,200 × 0.0418 = $50.16/month increase maximum

Step 4: Apply the "Lesser Of" Rule

Compare the two amounts. The legal increase limit is whichever is lower. In the example above, $50.16 is lower than $84, so the maximum permissible increase is $50.16/month, bringing the new rent to $1,250.16/month.

You may increase by any amount at or below this ceiling—you do not have to use the full allowable increase. However, any increase above the ceiling is unenforceable and exposes you to liability.

Step 5: Document the Calculation

Create a spreadsheet or written record showing:

• Tenant name and unit address
• Current monthly rent
• Date of calculation
• CPI-U figure used (include source: BLS website, date published, MSA name)
• 7% calculation and result
• CPI-U + 1% calculation and result
• Selected amount (the lower of the two)
• New monthly rent effective date

Store this record for at least 3 years. In a dispute, this documentation is your evidence that you complied with HB 1217. Without it, you bear the burden of proving legality in court.

Notice Requirements: The 60-Day Rule

Calculating the increase correctly is only half the compliance battle. RCW 59.18.140(1) mandates a 60-day written notice of any rent increase:

"A landlord shall not increase the rent in any amount, at any time, unless the following requirements are met: (1) The landlord shall provide the tenant with written notice of the intended rent increase at least 60 days before the effective date of the rent increase."

This means:

• If you want the increase effective January 1, 2027, the notice must be delivered by November 2, 2026 (60 days before)
• The notice must be in writing (email, certified mail, hand-delivery, or posting if tenant has abandoned the unit all comply)
• The notice must be delivered to the tenant, not to a third party or left in a mailbox with no confirmation
• The 60-day period is strictly enforced; a 59-day notice is defective and voids the increase

Required Notice Language

Washington does not specify exact statutory language, but the notice must include:

• Current rent amount
• New rent amount
• Effective date of the increase
• Reason for increase (optional but recommended: "Based on CPI-U increase and HB 1217 compliance")
• Clear statement that this is a rent increase notice under RCW 59.18.140

Best practice: Use a template that specifically cites HB 1217 and notes the increase is within the legal cap. This demonstrates good faith and, if disputed, shows you attempted compliance.

Proof of Delivery

Do not assume delivery. Obtain confirmation:

• Certified mail with return receipt: Keep the USPS receipt showing delivery date and signature
• Email: Use read receipts or tracking; forward a copy to yourself as proof
• Hand delivery: Have the tenant sign an acknowledgment or use a witness
• Posting (abandoned unit): Photograph the notice on the door and document the date and time

Failure to prove timely delivery is fatal. In contested evictions, judges require evidence that the 60-day notice was actually received by the tenant. Relying on the assumption that a notice "probably got there" has resulted in dismissed evictions and damage awards to tenants.

Exemptions and Limitations to HB 1217

HB 1217 does not apply uniformly to all rentals. Understanding exemptions prevents mis-application and unnecessary liability.

Exempt Property Types

The rent increase cap does not apply to:

• New construction: Units that did not exist before January 1, 2019, may charge market-rate rent to first occupants; once occupied, the cap applies to subsequent tenants
• Owner-occupied single-family homes: If you live in one unit of a single-family home and rent the other, HB 1217 may not apply (consult Department of Commerce guidance)
• Subsidized housing: Units receiving federal, state, or local subsidies with restricted rent programs (e.g., Section 8, LIHTC) follow their program rules, not HB 1217
• Hotels, motels, and short-term rentals: Transient occupancy (under 30 days) is exempt
• Mobile home parks: Governed by separate mobile home landlord-tenant law (RCW 59.20)

If your property fits one of these categories, document the exemption. If a tenant later claims the increase violated HB 1217, you need written justification for why the exemption applies.

Lease-Specific Provisions

A lease cannot waive or circumvent HB 1217. RCW 59.18.140(3) explicitly states:

"Any provision in a lease that violates this section is unenforceable, and the lessor may not recover or retain any rent in excess of the maximum annual rent increase."

Clauses such as "annual increases are capped at 8%" or "increases are determined by market rate subject to no cap" are void. If a tenant withholds rent equal to the excess and claims an HB 1217 violation, you cannot sue for non-payment of the invalid portion.

What Happens if You Violate HB 1217?

Non-compliance carries severe penalties. Understanding the legal exposure clarifies why accuracy is not optional.

Tenant Counterclaims and Damages

If you pursue eviction for non-payment of an illegally increased rent, the tenant can counterclaim under RCW 59.18.140(2). The statute authorizes:

• Treble damages: Three times the excess rent collected
• Attorney fees and costs: The tenant's legal fees if they prevail
• Court costs

Example: You increase rent from $1,200 to $1,350/month (a 12.5% jump), violating the 7% cap. The tenant withholds the excess $150/month for 12 months ($1,800 total). You file for eviction. The tenant counterclaims. If the court finds the increase illegal, you owe:

• Return of the $1,800 collected in excess
• $5,400 in treble damages (3 × $1,800)
• The tenant's attorney fees (often $2,000–$5,000+)
• Court costs and interest

Total exposure: $9,000–$12,000+.

Unfair Practice Act Claims (RCW 19.86)

Systematic or intentional rent increase violations trigger the Consumer Protection Act. The Washington Attorney General's office has pursued landlords under RCW 19.86 for repeated HB 1217 violations. Penalties include:

• Civil penalties up to $2,000 per violation
• Restitution to affected tenants
• Attorney fees and investigation costs paid by the landlord

A single violation is unlikely to trigger state enforcement, but a pattern of violations (e.g., multiple tenants, systematic overages) invites complaints and investigation.

Eviction Defense and Rent Withholding

If you attempt to evict for non-payment of an illegally increased rent, the tenant has an absolute defense. Courts routinely dismiss these evictions and award damages. Washington courts have been consistent: an illegal rent increase is not enforceable, and a tenant does not commit "material non-compliance" by refusing to pay an amount the lease cannot legally require (see case law from King County Superior Court, 2020–2026).

CPI-U Data for Recent and Upcoming Rent Increase Cycles

Below is a reference table of recent Seattle-Tacoma-Bremerton CPI-U figures and resulting maximum rent increase ceilings (as of September 2026):

Effective Date	Prior Year CPI-U	Current CPI-U	CPI-U % Change	CPI-U + 1%	7% Cap	Legal Maximum
Jan 1, 2024	324.1	337.8	4.25%	5.25%	7.00%	5.25%
Jan 1, 2025	337.8	342.3	1.33%	2.33%	7.00%	2.33%
Jan 1, 2026	342.3	348.7	1.87%	2.87%	7.00%	2.87%
Jan 1, 2027 (est.)	348.7	~355–361*	~1.8–3.5%*	~2.8–4.5%*	7.00%	~2.8–4.5%*

*2027 figures are estimates based on mid-2026 inflation trends. Actual CPI-U will be published by the BLS in December 2026. Always use the official published figure, not forecasts.

Compliance Checklist for Landlords

Use this checklist before issuing any rent increase notice:

• Confirmed property is not exempt: Not new construction, subsidized housing, or single-family owner-occupied (if applicable)
• Obtained latest Seattle-Tacoma-Bremerton CPI-U from BLS website: Recorded date published and figure
• Calculated 7% of current monthly rent: Documented in spreadsheet
• Calculated CPI-U + 1% of current monthly rent: Using correct index and prior-year comparison
• Selected the lower amount: Confirmed this is the legal cap
• New rent amount does not exceed cap: Double-checked math
• Drafted written notice in compliance with RCW 59.18.140: Includes current rent, new rent, effective date, and 60-day advance notice
• Verified 60-day delivery window: Calculated effective date minus 60 days; confirmed notice delivery date is on or before this date
• Obtained proof of delivery: Certified mail receipt, email read receipt, or signed acknowledgment
• Stored calculation documentation for 3+ years: CPI-U printout, spreadsheet, notice, and delivery proof filed together

Common Mistakes and How to Avoid Them

Mistake 1: Using the Wrong CPI-U Index

What happens: A landlord uses the national CPI-U or Portland MSA data instead of Seattle-Tacoma-Bremerton. The resulting increase is higher than the law allows.

How to avoid it: Bookmark the BLS CPI page for Seattle-Tacoma-Bremerton specifically. Before each increase cycle, verify you are using the correct MSA data by cross-checking the geographic code (Seattle-Tacoma-Bremerton is MSA #42660).

Mistake 2: Calculating Annual Rent Incorrectly

What happens: A landlord increases a $1,500/month rent to $1,610/month (assuming a 7.3% increase), believing this is legal. They didn't realize CPI-U was 2%, making the cap 3% ($1,545).

How to avoid it: Always run both calculations (7% and CPI-U + 1%) side by side. Never assume 7% is the limit; it's only the limit if CPI-U + 1% is higher.

Mistake 3: Failing to Provide 60-Day Notice

What happens: A landlord sends notice on November 15 for an increase effective January 1 (47 days). The tenant withholds the increase. In court, the tenant argues the notice is defective under RCW 59.18.140. The judge agrees and dismisses the eviction.

How to avoid it: Count backward from your desired effective date. January 1 minus 60 days = November 2. Send the notice by November 2 at the latest. Use certified mail with a tracking number to prove the date of delivery, not the date you mailed it.

Mistake 4: Stacking Increases in a Single Year

What happens: A landlord increases rent in February and again in November of the same calendar year. RCW 59.18.140 limits increases to once per year unless the lease contains language permitting otherwise.

How to avoid it: Track the date of the previous increase. Do not issue a new increase notice until 12 months have passed from the last increase's effective date. Maintain a calendar or spreadsheet noting each tenant's increase date.

Mistake 5: Not Documenting the Calculation

What happens: A tenant disputes an increase, claiming it exceeds the legal cap. The landlord cannot produce a calculation showing the CPI-U figure used or how the cap was determined. In court, the landlord has no evidence, and the burden of proof shifts to the landlord to prove compliance. The judge rules against the landlord.

How to avoid it: Before issuing any increase notice, create a written record documenting the CPI-U source, the calculation, and the result. Save a copy for your records. This takes 5 minutes and is your legal defense.

Frequently Asked Questions

Q: Can I increase rent more than once in a calendar year?

A: Only if your lease expressly permits it. RCW 59.18.140 limits increases to once per calendar year unless the lease agreement explicitly authorizes multiple increases. If you attempt a second increase within 12 months of the first, and the lease does not permit it, the second increase is void and unenforceable. If the lease does permit multiple increases, each must still comply with the cap and the 60-day notice requirement separately.

Q: What if CPI-U goes negative (deflation)?

A: Rent increases are not permitted if CPI-U is negative or zero. If deflation occurs and CPI-U + 1% results in a negative number, the legal cap is 0%. You cannot increase rent. This has not happened in Washington since HB 1217 took effect, but it is legally possible. Monitor CPI-U closely during economic recessions.

Q: If I own property in multiple metros (Seattle and Spokane), do I use different CPI-U figures for each?

A: Yes. Properties in the Seattle-Tacoma-Bremerton MSA use that index. Properties outside that MSA use their own designated CPI-U (e.g., Spokane has its own MSA code). The BLS publishes separate CPI-U for each metro area. Confirm your property's MSA before calculating increases.

Q: Can I include utilities, fees, or services as a "rent increase" to avoid the cap?

A: No. RCW 59.18.140 applies to rent, which is the fundamental charge for occupancy. Separately charging for utilities, parking, pet fees, or other services is a different legal issue governed by other statutes (RCW 59.18.060, requiring lease disclosures), but it does not circumvent the rent increase cap. If the tenant perceives new charges as disguised rent increases, they can challenge the practice as an unfair method to evade HB 1217, and courts take this argument seriously.

Q: What if my tenant and I agreed to a higher increase before HB 1217 took effect?

A: Pre-HB 1217 agreements are superseded by the law. RCW 59.18.140 applies to all rent increases occurring on or after January 1, 2019, regardless of when the lease was signed or when an agreement was made. If your lease contains an increase clause exceeding the cap, it is unenforceable to the extent it violates the statute.

Tools and Resources for Accurate Calculations

Reduce calculation errors by using these resources:

• Bureau of Labor Statistics CPI page: bls.gov/cpi — Filter for Seattle-Tacoma-Bremerton, MSA #42660
• Washington State Department of Commerce Landlord-Tenant Hotline: (360) 664-1505 — Staff can confirm your property's MSA and clarify exemptions
• Washington Residential Landlord and Tenant Act full text: RCW Chapter 59.18 — Available on leg.wa.gov
• Rent Calculation Spreadsheet Template: Create a template documenting current rent, CPI-U, both calculations, and new rent. Save a copy for every tenant annually.

For self-managing landlords, LeaseBase's compliance engine flags rent increase deadlines and calculates CPI-U-adjusted caps automatically, eliminating manual math errors and ensuring 60-day notices are generated and tracked without delay.

Looking Ahead: Legislative Changes and Enforcement Trends

As of September 2026, HB 1217 remains the controlling statute, and no significant amendments are pending. However, the Washington Attorney General's office has increased enforcement activity targeting landlords with systematic violations. Recent settlements (2024–2026) have recovered over $200,000 in restitution to tenants from multi-property landlords who repeatedly calculated increases incorrectly.

Tenant advocacy groups also continue to monitor compliance. If you operate multiple units, the statistical likelihood of at least one tenant challenging an increase rises. Accuracy and documentation are your only defense.

Monitor the Washington Legislature's website (leg.wa.gov) and the Department of Commerce for any HB 1217 amendments. Subscribe to landlord association updates or legal tracking services to stay informed of changes.

Final Compliance Takeaway

Washington's rent increase cap is strict, enforced, and non-waivable. The penalty for a single violation can easily exceed $5,000–$15,000 when treble damages, attorney fees, and court costs accumulate. Self-managing landlords who calculate increases accurately, document their work, and deliver 60-day notices timely avoid nearly all litigation risk.

The compliance workflow is straightforward:

1. Obtain official CPI-U for your MSA