Key Takeaways
- HB 1217 caps annual rent increases — Washington limits rent hikes to the lesser of 7% or the 12-month change in BLS Consumer Price Index for Urban Consumers (CPI-U) for the Seattle-Tacoma-Bremerton region, effective through 2025
- 7% hard ceiling applies statewide — Even if CPI-U exceeds 7%, you cannot legally increase rent beyond 7% annually on any unit
- CPI-U is published monthly by the Bureau of Labor Statistics — You must use the official 12-month percentage change (not raw index numbers) to calculate your maximum increase
- Rent increase notices require 60 days’ written notice — RCW 59.18.140 mandates notice timing; failure to provide proper notice voids the increase
- Non-compliance penalties are severe — Violations can result in treble damages, attorney fees, and potential loss of unlawful detainer cases in eviction proceedings
- The cap applies to all units under 75 units — Your portfolio size does not exempt you; only pre-1995 buildings have limited exemptions under specific conditions
What Is HB 1217 and When Did It Take Effect?
Washington House Bill 1217, signed into law in 2023 and effective January 1, 2024, established the first statewide rent increase cap in Washington history. This statute fundamentally changed how you calculate annual rent increases and carries significant penalties for non-compliance.
The law applies to all rental units in buildings with any number of units—whether you own 2 units or 70. There is no portfolio-size exemption. The cap remains in effect through December 31, 2025, and may be extended by the Washington Legislature.
Understanding HB 1217 is not optional. Charging more than the legal ceiling constitutes an unlawful rent increase under RCW 59.18.030 and gives tenants grounds to sue for damages, attorney fees, and court costs. It also weakens your position in eviction cases; courts have repeatedly rejected eviction cases where landlords violated rent cap statutes.
The HB 1217 Rent Increase Formula: 7% or CPI-U, Whichever Is Lower
HB 1217 creates a dual-ceiling structure. Your maximum allowable annual rent increase is the lesser of:
- 7% of the current rent, OR
- The 12-month percentage change in the Bureau of Labor Statistics Consumer Price Index for Urban Consumers (CPI-U) for the Seattle-Tacoma-Bremerton metropolitan area
The critical word is “lesser.” If CPI-U rises 8%, your cap is still 7%. If CPI-U rises 3.2%, your cap is 3.2%. You cannot exceed either threshold.
Example 1 (2024 Application): A tenant’s rent is $1,400/month. The 12-month CPI-U change for Seattle-Tacoma-Bremerton (August 2023 to August 2024) was approximately 3.0%. Your maximum increase is the lesser of 7% ($98) or 3.0% ($42). You can legally increase rent to $1,442/month.
Example 2 (Scenario): If CPI-U rises to 8% in a future year, your cap remains 7% due to the hard ceiling. A $1,500/month unit can increase to a maximum of $1,605/month, not $1,620/month.
How to Find and Use the Correct CPI-U Data
The Bureau of Labor Statistics publishes CPI-U data monthly. To calculate your rent increase ceiling, you must use the 12-month percentage change in the CPI-U index for the Seattle-Tacoma-Bremerton region (also called the Seattle-Tacoma metropolitan area).
Step 1: Locate the Official BLS Data
Visit the Bureau of Labor Statistics website (bls.gov) and search for “CPI-U Seattle-Tacoma-Bremerton.” The official series ID is APUU49318SA0.
Do not use national CPI-U data. Washington law specifically requires the regional index for Seattle-Tacoma-Bremerton. Using the national average or a different city’s index violates the statute and exposes you to liability.
Step 2: Identify the Correct 12-Month Period
If you are serving a rent increase notice in August 2026, use the 12-month change from August 2025 to August 2026. The statute requires the 12-month percentage change, not a year-to-date change or any other period.
Example timing:
- Notice served August 2026 → Use CPI-U change August 2025 to August 2026
- Notice served January 2027 → Use CPI-U change January 2026 to January 2027
Step 3: Calculate the Percentage Change
BLS publishes both the raw index number and the 12-month percentage change. Use the 12-month percentage change directly. Do not manually calculate it from raw index numbers unless you are certain of your math.
The data appears in BLS tables as “Percent Change from Year Ago” or similar phrasing. The Seattle-Tacoma regional data is updated monthly, typically on the second Tuesday of each month.
Critical Notice Requirements: 60-Day Timing and Written Delivery
Calculating the correct rent increase ceiling is only half the battle. You must also deliver proper notice, or the increase is void.
RCW 59.18.140 Notice Requirements
Washington law requires:
- 60 days’ written notice before the effective date of any rent increase
- Written delivery — Email, certified mail, personal delivery, or posting at the unit are acceptable; oral notice is not
- Clear statement of the new rent amount and effective date
- Statement of the amount of the increase (optional but recommended to demonstrate compliance)
If you serve notice fewer than 60 days before the increase takes effect, the increase is void. Tenants do not have to pay the increased amount, and courts will not enforce it in eviction proceedings.
Example: If you serve a rent increase notice on June 1st, the earliest effective date is August 1st (61 days later). If the effective date is July 15th, the notice is defective.
Proof of Service Matters
Keep documented proof of service. If you mail the notice, retain the certified mail receipt. If you email, save the email with read receipt or delivery confirmation. If you post it at the unit, photograph the posting and document the date and time.
In disputes, you will need to prove you delivered the notice 60+ days before the increase took effect. Failure to do so forfeits the increase entirely.
Pre-1995 Building Exemptions: Limited and Specific
HB 1217 does include a narrow exemption for certain older buildings. However, the exemption is extremely limited and rarely applies in practice.
Owners of residential rental buildings containing 4 or fewer units that were constructed before 1995 may be eligible for an exemption if:
- The building is located outside a city or town with a local rent-increase cap
- The owner has met local notification requirements (if any)
- The owner qualifies under additional criteria related to local affordability policies
This exemption does not apply to:
- Buildings in cities or towns that have adopted their own rent-increase caps (such as certain Seattle or Tacoma ordinances)
- Buildings with 5 or more units
- Buildings constructed in 1995 or later
If you believe you qualify for this exemption, consult a Washington landlord-tenant attorney before relying on it. The burden is on you to prove exemption eligibility, and courts strictly construe exemptions against landlords.
Legal Consequences for Violating the Rent Increase Cap
Non-compliance with HB 1217 carries penalties that often exceed the financial benefit of charging excess rent. Courts and tenants take rent cap violations seriously.
Statutory Damages and Treble Damages
A tenant who is charged rent in excess of the HB 1217 ceiling can recover:
- All excess rent paid (the amount charged above the legal ceiling)
- Treble damages (three times the excess amount) if the violation is deemed willful or reckless
- Attorney fees and court costs — The tenant’s lawyer is paid by you if the case goes to court
- Pre-judgment interest at the legal rate (currently 8% per annum in Washington)
Example: You charge a tenant $1,600/month when the legal cap is $1,500/month. Over 12 months, the excess is $1,200. If deemed willful, you owe treble damages of $3,600, plus attorney fees (often $3,000–$8,000), plus court costs, plus interest. The total liability can exceed $12,000 on a single unit.
Impact on Eviction Cases
If you file an unlawful detainer (eviction) against a tenant for nonpayment, the tenant can raise your rent cap violation as an affirmative defense or counterclaim. Washington courts have dismissed eviction cases where landlords violated rent-increase statutes, reasoning that the landlord breached the lease first by charging unlawful rent.
Even if you ultimately win the eviction, the legal fees and delays are substantial. Compliance costs nothing compared to the cost of a defended eviction.
Enforcement by Attorney General and Local Authorities
Washington’s Attorney General’s office and local prosecutors can bring civil actions against landlords for systematic rent cap violations. Some cities, such as Seattle, also enforce local rent-increase ordinances alongside HB 1217.
While individual tenant suits are more common, enforcement actions have resulted in six-figure settlements and restitution orders.
Step-by-Step Compliance Checklist for 2026 Rent Increases
Use this checklist before serving any rent increase notice:
| Compliance Step | Action Required | Deadline/Frequency |
|---|---|---|
| Find current CPI-U for Seattle-Tacoma-Bremerton (12-month change) | Visit bls.gov; record the official 12-month percentage change for the month you plan to serve notice | Monthly, before serving notice |
| Calculate maximum rent increase: Lesser of 7% or CPI-U % | Compare 7% against the CPI-U percentage; use the lower number | For each unit before calculating new rent |
| Calculate new rent amount | Multiply current rent by (1 + the lower percentage); round to nearest cent | For each unit |
| Determine effective date (must be 60+ days away) | Count forward 60 calendar days from the date notice will be served; effective date must be on or after day 61 | Before serving notice |
| Draft written notice | Include current rent, new rent, effective date, and statement of amount of increase | Before serving |
| Serve notice via acceptable method | Certified mail, email (if tenant agrees), personal delivery, or posting at unit with photo documentation | 60+ days before effective date |
| Document proof of service | Retain certified mail receipts, email read receipts, photos of postings, or witness statements | At time of service; keep for statute of limitations (4 years) |
| Record new rent in lease/system | Update all records, rent-collection systems, and accounting; flag effective date | Upon service of notice |
CPI-U Data for Recent and Upcoming Years
For reference, here are the 12-month CPI-U percentage changes for Seattle-Tacoma-Bremerton (approximate, based on BLS historical data). Always verify with the official BLS website before serving notice.
| Period | 12-Month CPI-U Change (%) | Maximum Legal Rent Increase |
|---|---|---|
| August 2023 to August 2024 | ~3.0% | 3.0% (lesser of 7% or 3.0%) |
| August 2024 to August 2025 | ~2.8% (estimated) | 2.8% (estimated; verify with BLS) |
| August 2025 to August 2026 | TBD (check monthly) | Lesser of 7% or actual CPI-U % |
Critical note: These are estimates based on historical data. You must use the official BLS figures published for the specific month in which you serve notice. Do not rely on prior years’ data or estimates when calculating 2026 increases.
Interplay with Local Rent-Increase Caps
Some Washington cities—including Seattle and Tacoma—have adopted their own local rent-increase ordinances. If your property is located in a city with a local cap, you must comply with whichever is stricter: HB 1217 or the local ordinance.
For example, if Seattle’s local ordinance caps increases at 4% and HB 1217 allows 5%, you are limited to 4%. Conversely, if a local cap allows 6% and HB 1217 allows 5%, you are limited to 5%.
Check your city or county’s municipal code before serving any rent increase notice. Compliance with HB 1217 alone is not sufficient if local law is stricter.
How Compliance Automation Reduces Risk
Managing multiple rent increases across a portfolio of units creates opportunities for error. One miscalculated percentage, one missed deadline, or one incomplete notice can expose you to thousands in liability.
LeaseBase’s compliance engine automatically pulls current BLS CPI-U data, calculates the maximum allowable increase for each unit, flags notice deadlines, and generates compliant notice templates with all required disclosures. Your rent increases are documented and dated, and proof of service is centralized—ready for dispute or defense.
Self-managing landlords who use spreadsheets or manual calculations run unnecessary risk. The cost of one compliance mistake (treble damages + attorney fees) far exceeds what you’d spend on automated compliance tools.
Frequently Asked Questions
Q: If my lease says I can raise rent by 10% annually, can I override HB 1217 with the lease language?
No. HB 1217 is a state law that supersedes lease terms. Any lease clause permitting rent increases above the HB 1217 ceiling is unenforceable. If you attempt to enforce such a clause, you expose yourself to the penalties described above. Revise all lease templates immediately to cap increases at the legal maximum.
Q: Do I have to wait for the 60-day notice period to end before raising rent, or does the new rent take effect immediately at the notice date?
The rent increase takes effect on the date you specify in the notice, and that date must be at least 60 days after service. If you serve notice on June 1st, the earliest effective date is August 1st. Until August 1st, the tenant must pay the old rent. Beginning August 1st, the new rent is due. If the tenant pays the old rent amount after the effective date, you can issue a three-day notice for nonpayment of the increase (the difference).
Q: The 12-month CPI-U increased 6.5%, so can I increase rent by 6.5%, or do I have to use exactly 7%?
You can increase by up to 6.5%—you are not required to use the full allowable amount. Many landlords increase rent by less than the maximum to maintain tenant goodwill and reduce turnover. The law sets a ceiling, not a floor. You can charge any amount up to the ceiling, including no increase at all.
Q: What if I made a mistake and served a rent increase notice that violates HB 1217? Can I re-serve a corrected notice?
Not easily. If you served a non-compliant notice (wrong amount, insufficient notice period, or improper service), that notice is void. You can serve a new, compliant notice, but you must still wait 60 days from the new service date. You cannot “correct” the old notice retroactively. If the tenant has already paid excess rent under the invalid notice, you may owe it back plus damages. Correct errors immediately by written notice and consult an attorney if significant overpayment has occurred.
Q: Does HB 1217 apply to rent increases for month-to-month tenancies, or only to lease renewals?
HB 1217 applies to all rent increases, regardless of whether the tenant is on a fixed-term lease or month-to-month. Both scenarios require a 60-day notice and must comply with the 7%/CPI-U cap. The notice requirements are identical: 60 days’ written notice before the effective date.
Key Dates and Compliance Calendar for 2026
- August 2026 (current): Check BLS website for the most recent 12-month CPI-U change for Seattle-Tacoma-Bremerton to calculate fall/winter 2026 increases
- October 2026: Any rent increase notice served this month must have an effective date of December 1, 2026 or later (60-day minimum)
- December 31, 2025 (noted for planning): Current sunset date of HB 1217; legislature may extend. Monitor legislative updates
- All months: Retain copies of rent increase notices, CPI-U data records, proof of service, and tenant payment records for at least 4 years (statute of limitations)
Moving Forward: Compliance, Not Guesswork
Washington’s rent-increase cap is the law of the land through 2025, with possible extension. Compliance is non-negotiable. A single miscalculation exposes you to liability that dwarfs any benefit of charging above the ceiling.
Document everything: the CPI-U figures you used, the calculation, the notice served, and proof of service. If you manage multiple units, establish a system (digital or manual) to track each unit’s increase separately and ensure no unit slips through at an illegal amount.
LeaseBase’s lease operations module tracks all rent changes, integrates CPI-U data, and flags compliance issues before you serve notice. For self-managers handling 2–75 units, this is the difference between confidence and liability.
Speak with a Washington landlord-tenant attorney if you have questions specific to your properties, local ordinances, or past rent increase practices. An hour of legal counsel is far cheaper than defending a class action by multiple tenants or an enforcement action by the Attorney General.
Disclaimer: This article is for informational purposes only and does not constitute legal advice. Washington landlord-tenant law is complex and subject to local variations. Consult a qualified attorney licensed in Washington for guidance specific to your situation, properties, and lease agreements.