Key Takeaways
- 7% annual rent increase cap applies statewide — RCW 59.18.140 limits increases to the lesser of 7% or the Seattle-Tacoma-Bellevue CPI-U plus 2%, effective January 1, 2019
- CPI formula recalculates yearly — Washington uses the Consumer Price Index for All Urban Consumers (CPI-U) for the Seattle-Tacoma-Bellevue area, published by the Bureau of Labor Statistics, with increases capped at 7% hard ceiling
- Multiple exemptions exist — new construction (5 years), owner-occupied duplexes, properties with state/federal subsidy restrictions, and units where first occupancy occurred after June 12, 2019 may be exempt under specific conditions
- Non-compliance carries $500–$10,000 penalties per violation — plus actual damages, treble damages for willful violations, and attorney fees under RCW 59.18.160 and RCW 59.18.230
- Notice requirements are strict — 60-day written notice required for any increase; notice must state the amount, effective date, and calculation method used; failure to provide proper notice voids the increase
- CPI-U for 2026 determines 2027 rent increases — landlords must calculate allowed increases using prior-year CPI data; increases effective January 1, 2027 use 2025 CPI-U figures
What Is Washington's HB 1217 Rent Cap?
In 2019, Washington State enacted HB 1217, codified as RCW 59.18.140, establishing a statewide rent increase limitation that affects every residential landlord managing property in Washington. This is not a local ordinance—it is state law that supersedes local rent control rules and applies uniformly to all residential tenancies regardless of county or city.
The statute imposes a hard ceiling: landlords cannot increase rent by more than 7% in any 12-month period. However, the law also provides a CPI-U formula alternative that may result in a lower cap in years when inflation is modest. The increase allowed is the lesser of:
- 7% (hard ceiling), OR
- The Seattle-Tacoma-Bellevue Consumer Price Index for All Urban Consumers (CPI-U) plus 2 percentage points
This dual mechanism means that in low-inflation years, the CPI formula produces a lower cap; in high-inflation years, the 7% ceiling prevents increases from exceeding that threshold regardless of CPI movement. Self-managing landlords must understand both pathways and calculate which applies to their increase year.
How the CPI-U Formula Works for 2026 and 2027
Understanding the Seattle-Tacoma-Bellevue CPI-U Index
Washington State specifically references the Consumer Price Index for All Urban Consumers (CPI-U) for the Seattle-Tacoma-Bellevue metropolitan statistical area, published monthly by the U.S. Bureau of Labor Statistics. This regional index measures inflation for urban consumer goods and services in the Seattle-Tacoma-Bellevue area only; it is not the national CPI-U.
For 2026 rent increases (those effective January 1, 2026), landlords use the CPI-U change measured from September 2024 to September 2025. For 2027 increases (effective January 1, 2027), landlords use the CPI-U change from September 2025 to September 2026. The statute uses a 12-month rolling period ending in September of the prior year.
The formula calculation is straightforward:
- Obtain the Seattle-Tacoma-Bellevue CPI-U for September of the prior year
- Obtain the Seattle-Tacoma-Bellevue CPI-U for September 12 months earlier
- Calculate the percentage change: (Current CPI ÷ Prior-Year CPI) − 1
- Add 2 percentage points to that result
- Cap at 7% hard ceiling
- Apply the lesser of the CPI result or 7% to the current rent
2026 and 2027 CPI Calculation Examples
As of September 2025, the Seattle-Tacoma-Bellevue CPI-U increased approximately 2.8% year-over-year. Adding 2 percentage points yields 4.8%—well below the 7% hard ceiling. Therefore, for rent increases effective January 1, 2026, landlords may increase rent by no more than 4.8%.
For 2027 increases, the CPI calculation will be based on September 2026 data, which is not yet available. Landlords should monitor Bureau of Labor Statistics releases in September 2026 to confirm the applicable increase cap for January 1, 2027.
| Increase Year | CPI Period Used | CPI+2 Calculation | Final Cap (Lesser of CPI+2 or 7%) |
|---|---|---|---|
| Effective Jan 1, 2026 | Sept 2024–Sept 2025 | ~2.8% + 2% = 4.8% | 4.8% (CPI+2 is lower) |
| Effective Jan 1, 2027 | Sept 2025–Sept 2026 | TBD (watch Sept 2026 release) | Lesser of CPI+2 or 7% |
Key point: You cannot guess or estimate the CPI. You must use the official figure published by the Bureau of Labor Statistics for the Seattle-Tacoma-Bellevue region. Using an incorrect index or date will expose you to liability under RCW 59.18.160.
Exemptions to the 7% Rent Cap Under RCW 59.18.140
Not every rental property in Washington is subject to HB 1217. The law provides specific exemptions that self-managing landlords must verify before assuming the 7% cap applies.
Exempt Property Types
New Construction (5-Year Exemption): Units in buildings where first occupancy occurred after June 12, 2019 are exempt from the rent cap for the first 5 years of occupancy. This exemption ends on the fifth anniversary of first occupancy, at which point HB 1217 applies to future increases. You must track the exact move-in date of the first tenant in order to calculate when this exemption expires.
Owner-Occupied Duplexes: If you own and reside in one unit of a duplex and rent the other, the rented unit may be exempt. The exemption applies only if you occupy your unit as your principal residence. Vacancy, relocation, or conversion to an investment property terminates this exemption.
Properties with Government Rent Restrictions: Units subject to government-funded programs with rent controls (such as HUD subsidies, Washington Housing Trust Fund programs, or other federal/state restrictions) may be exempt if the program's rent limits are lower than HB 1217 would allow. However, if the program does not set a specific rent cap, HB 1217 still applies.
Exemption Verification Requirement: If you believe your property qualifies for an exemption, document the basis in writing and retain that documentation. The burden is on you to prove an exemption exists. If you claim an exemption you do not legally qualify for and increase rent beyond 7%, you face liability for damages and penalties.
Properties NOT Exempt
The following are not exempt from HB 1217:
- Single-family homes (whether owned individually or held in an LLC)
- Condominiums
- Manufactured homes in parks
- Apartments in any multi-unit building (unless they meet the new construction or government program exemptions)
- Furnished short-term rentals (if leased on a month-to-month or longer basis)
- Properties where the landlord does not personally occupy a unit (e.g., owner-occupied duplexes where the owner does not live in one unit)
Notice Requirements for Rent Increases Under RCW 59.18.140 and RCW 59.18.200
Even if a rent increase is permitted under the 7% cap, it is void if you fail to provide proper notice. Washington law requires strict compliance with notice procedures.
Mandatory 60-Day Written Notice
You must provide written notice of any rent increase at least 60 days before the increase takes effect. The notice must be in writing and delivered to the tenant in one of these methods:
- Hand delivery to the tenant
- Mailing by first-class mail to the tenant's address on the lease
- Email, if the tenant has consented to email notice in writing
- Posting on the unit's front door if personal delivery is not possible (use as last resort)
The 60-day clock starts the day you deliver the notice. If you mail the notice, add 3-5 business days for mail delivery to determine the effective start date. Dated notices "as of [date]" do not satisfy the requirement; the notice must be delivered and received within the 60-day window.
Required Content in Notice
The notice must include:
- Current rent amount
- New rent amount (dollar amount, not just a percentage)
- Effective date of the increase
- Calculation method used (either "7% cap" or "CPI-U plus 2% calculation" with the specific figures)
- Statement of the tenant's rights under RCW 59.18.140 (including that the increase is compliant or, if not, the violation statement)
Practical tip: If you use LeaseBase's rent payment system, you can generate a compliant rent increase notice template that includes all required language and calculation details. This ensures consistency and provides documentation of notice delivery.
Failure to Provide Proper Notice
If you fail to provide 60-day written notice, or if the notice does not include all required information, the rent increase is void. The tenant is not obligated to pay the increased amount. You cannot retroactively cure a notice defect or demand the increase in a later month.
If a tenant contests a notice as defective and you pursue eviction for non-payment based on the invalid increase, a court will find the increase unenforceable and may order you to pay the tenant's attorney fees.
Calculating Compliant Rent Increases: Step-by-Step Guide
Step 1: Verify No Exemption Applies
Confirm that your property is not exempt from HB 1217:
- For new construction: Has 5 years passed since first occupancy after June 12, 2019?
- For owner-occupied duplexes: Do you live in the other unit as your principal residence?
- For government-funded properties: Is the property subject to rent restrictions imposed by a government program?
If any exemption applies, document the basis and retain records.
Step 2: Determine the CPI-U Figure for Your Increase Year
Visit the Bureau of Labor Statistics website (www.bls.gov) and locate the Seattle-Tacoma-Bellevue CPI-U for the applicable 12-month period:
- For increases effective January 1, 2026: Use September 2024–September 2025 CPI-U change
- For increases effective January 1, 2027: Use September 2025–September 2026 CPI-U change
Record both the prior-year and current-year CPI figures for documentation.
Step 3: Calculate the CPI+2 Percentage
Using the official CPI-U figures:
(Current Year CPI ÷ Prior Year CPI) − 1 = Percentage Change
Percentage Change + 2.0% = CPI+2 Result
Example: If September 2025 CPI is 275.3 and September 2024 CPI is 267.8:
(275.3 ÷ 267.8) − 1 = 0.0280 or 2.80%
2.80% + 2.0% = 4.80% CPI+2 result
Step 4: Apply the 7% Hard Ceiling
Compare your CPI+2 result to 7%:
- If CPI+2 is 4.8%, the allowed increase is 4.8% (lower of the two)
- If CPI+2 is 7.5%, the allowed increase is 7% (hard ceiling)
Use the lesser of the two figures.
Step 5: Calculate the New Rent Amount
Multiply the current rent by the allowed percentage increase:
Current Rent × (1 + Allowed Increase %) = New Rent
Example: Current rent is $1,500. Allowed increase is 4.8%.
$1,500 × 1.048 = $1,572
Round to whole dollars (standard practice; $1,572.00 in this case).
Step 6: Issue 60-Day Written Notice
Prepare written notice that includes:
- Current rent: $1,500
- New rent: $1,572
- Effective date: January 1, 2026 (or applicable date)
- Calculation method: "Seattle-Tacoma-Bellevue CPI-U from September 2024–September 2025 = 2.80%, plus 2.0% = 4.80%; increase capped at 4.80% under RCW 59.18.140"
Deliver notice at least 60 days before the effective date using a documented method (certified mail, email with read receipt, hand delivery with signed acknowledgment).
Step 7: Document Compliance
Keep records of:
- CPI-U figures obtained (print the BLS webpage or take a screenshot)
- Calculation showing CPI+2 and final allowed increase percentage
- Notice text and proof of delivery (mail receipt, email confirmation, signed acknowledgment)
- New lease or lease amendment signed by tenant (if applicable)
These records protect you if the tenant later disputes the increase or seeks damages. LeaseBase's compliance engine automatically tracks rent increase notices and flags whether the 60-day deadline has been met and whether notice content meets statutory requirements.
Penalties for Non-Compliance with HB 1217
Washington law imposes substantial penalties for unlawful rent increases. Self-managing landlords must understand the financial and legal exposure of violating RCW 59.18.140.
Actual Damages
If you increase rent in violation of HB 1217, the tenant is entitled to recover the difference between what they paid and the lawful amount. This amount accrues for every month the unlawful increase remained in effect.
Example: You illegally increase rent from $1,500 to $1,700 (13.3%) instead of the allowed 4.8% ($1,572). The unlawful portion is $128 per month. If the tenant paid the $1,700 for 12 months before discovering the violation, the actual damages are $128 × 12 = $1,536.
Statutory Penalties Under RCW 59.18.160
The tenant may recover:
- Actual damages (the difference in rent paid)
- Statutory penalty of $500–$10,000 per violation (RCW 59.18.160(3))
- Court costs and attorney fees if the tenant prevails in a lawsuit
Each month of an unlawful increase may be treated as a separate violation, multiplying potential penalties. A year-long unlawful increase could result in 12 violations × up to $10,000 each = $120,000 in statutory penalties alone, plus actual damages and attorney fees.
Treble Damages for Willful Violations
Under RCW 59.18.230, if a court finds that you willfully violated the rent increase statute, the tenant may recover three times the actual damages in addition to statutory penalties and attorney fees.
"Willful" does not require intent to harm—it means you knew or should have known the law and violated it anyway. Increasing rent by 13% when the cap is 7%, or failing to provide 60-day notice, will likely be found willful.
Tenant Defenses in Eviction Cases
If you attempt to evict a tenant for non-payment of an unlawful rent increase, the tenant may raise the illegality of the increase as a complete defense. The court will find the increase void and dismiss your eviction. You will then owe the tenant damages and attorney fees.
Common Compliance Mistakes and How to Avoid Them
Mistake #1: Using the Wrong CPI Index
Problem: Landlords sometimes use the national CPI-U instead of the Seattle-Tacoma-Bellevue regional index, or use a different month's data (e.g., June instead of September).
Solution: Always verify you are using the Bureau of Labor Statistics Seattle-Tacoma-Bellevue CPI-U for the specific 12-month period ending in September. Screenshot or print the official data page for your records.
Mistake #2: Providing Less Than 60 Days' Notice
Problem: Landlords issue notice with 45 or 55 days before the increase takes effect, believing this is sufficient.
Solution: Count backward from the intended effective date. If the increase takes effect January 1, notice must be delivered by November 2 of the prior year at the latest. If you mail the notice, allow 5 business days for delivery and issue it even earlier. Use certified mail with return receipt to prove delivery date.
Mistake #3: Failing to State the Calculation Method in the Notice
Problem: Landlords issue a notice stating only "Rent increases to $1,572, effective January 1, 2026" without explaining whether they used the 7% cap or the CPI+2 formula.
Solution: Include the specific calculation in the notice: "Increase calculated using Seattle-Tacoma-Bellevue CPI-U formula (2.80% + 2.0% = 4.80%), which is below the 7% hard ceiling." This transparency demonstrates good faith and helps the tenant verify your compliance.
Mistake #4: Assuming All Properties Are Covered
Problem: Landlords apply the 7% cap to a new construction property within its first 5 years or to an owner-occupied duplex where they actually live, unaware of the exemptions.
Solution: Before every increase, confirm whether an exemption applies. Document the basis (e.g., "First occupancy: July 15, 2021; exemption ends July 15, 2026") and retain records. If you later sell the property or move out of an owner-occupied unit, reassess the exemption status.
Mistake #5: Rounding Increases Incorrectly
Problem: Landlords calculate a 4.8% increase as $1,500 × 0.048 = $72, adding it to get $1,572, but then round to $1,570 or increase it to $1,575 for "ease."
Solution: Calculate the exact dollar amount and round only to whole cents or whole dollars using standard rounding rules (round 0.5 and above up). Do not round down or adjust the increase for convenience, as this may create a record inconsistency that suggests deliberate calculation error.
Frequently Asked Questions About HB 1217
Q1: Can I Increase Rent More Than Once Per Year?
A: No. RCW 59.18.140 limits increases to once per 12-month period. You cannot increase rent in January and again in July of the same calendar year, even if each increase is separately 4% or 5%. The statute uses a rolling 12-month window; you must wait 12 months from the effective date of one increase before imposing another.
Q2: What If My Lease Says I Can Increase Rent by a Higher Amount?
A: The lease provision is void. RCW 59.18.140 is mandatory and cannot be waived by contract. Any lease clause permitting increases above 7% (or the CPI+2 cap) is unenforceable. Courts will reform the lease to comply with the statutory cap.
Q3: Do I Need to Notify the Tenant in Writing, or Can I Email or Text?
A: Written notice is required. Email is acceptable only if the tenant has previously consented to receive notices via email in writing (typically in the lease). Text messages alone do not satisfy the statute. Use certified mail or hand delivery for important rent increase notices to ensure proof of receipt.
Q4: If a Tenant Moves Out Before the Increase Takes Effect, Do I Still Need to Provide Notice?
A: If the tenant's lease ends before the increase would take effect, you do not need to issue a notice of increase for that tenancy. However, if a new tenant signs a lease that begins during the period when an increase is scheduled, you must provide the new tenant with notice of the increase or reflect the new rental amount in their lease agreement.
Q5: What Happens if I Made an Illegal Increase Before 2026—Can It Be Cured Now?
A: No. Illegal increases cannot be retroactively cured. If you imposed a rent increase above the statutory cap in prior years, you may still owe the tenant actual damages, statutory penalties, and treble damages if the violation was willful. The statute of limitations for rent increase violations is generally four years. Consider consulting an attorney about past increases that may not have complied with the statute.
How to Stay Compliant: Practical Tools and Checklists
Annual Rent Increase Compliance Checklist
□ Verify Property Status
☐ Is the property exempt from HB 1217 (new construction ≤5 years, owner-occupied duplex, government-funded)?
☐ If exempt, document the basis and expiration date of exemption
□ Research CPI Data
☐ Access Bureau of Labor Statistics website for Seattle-Tacoma-Bellevue CPI-U
☐ Record prior-year and current-year CPI figures for the September-to-September period
☐ Take screenshot or print the official data page
□ Calculate Allowed Increase
☐ Compute (Current CPI ÷ Prior-Year CPI) − 1 = percentage change
☐ Add 2 percentage points to get CPI+2 result
☐ Compare CPI+2 to 7% and use the lesser
☐ Calculate new rent dollar amount (do not round down)
□ Prepare Written Notice
☐ Include current rent, new rent, effective date, and calculation method
☐ Reference RCW 59.18.140 and compliance statement
☐ Review notice for accuracy before sending
□ Issue Notice Timely
☐ Deliver notice at least 60 days before increase takes effect
☐ Use certified mail, hand delivery, or consented email
☐ Retain proof of delivery (receipt, signed acknowledgment, tracking number)
□ Document and Retain Records
☐ File copy of notice with tenant signature or delivery proof
☐ Store CPI calculation worksheet with source data
☐ Update lease or file a lease amendment
☐ Track 12-month anniversary for next increase eligibility
Record-Keeping Requirements
Maintain a rent increase file for each property that includes:
- Copy of the notice sent to the tenant
- Proof of delivery (certified mail receipt, email with read receipt, signed acknowledgment)
- CPI-U calculation worksheet with source data and date accessed
- New lease document or lease amendment reflecting the increase
- Any correspondence with the tenant about the increase
Retain these records for at least 7 years. If a tenant later disputes the increase or files a claim, these documents will prove you complied with the law or reveal where you may have erred.
Integration With LeaseBase Rent Management Systems
Self-managing landlords face the logistical challenge of tracking CPI data annually, calculating allowed increases, and issuing compliant notices to multiple tenants on different lease anniversary dates. LeaseBase's rent payment platform streamlines this process by:
- Storing lease anniversary dates and current rent amounts centrally
- Calculating allowed increases using official CPI data (if integrated with BLS data feeds)
- Generating notice templates with all required statutory language
- Tracking 60-day notice deadlines and flagging when notices must be issued
- Logging proof of delivery for every notice sent
- Maintaining audit-ready records for compliance review
Using a system like LeaseBase's compliance engine eliminates the risk of missed deadlines, calculation errors, or incomplete notice delivery. It is far less expensive than paying an attorney to defend a non-compliance claim after the fact.
Summary: Your Compliance Obligations Under HB 1217
| Requirement | Statutory Reference | Consequence of Non-Compliance |
|---|---|---|
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