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

Understanding Washington’s Rent Cap Law (HB 1217)

On April 27, 2023, Washington Governor Jay Inslee signed House Bill 1217 into law, establishing a statewide rent increase cap that fundamentally changed how landlords in Washington can adjust tenant rents. Unlike some states with complex, jurisdiction-by-jurisdiction rent control rules, Washington’s law is uniform across all counties—but that doesn’t mean it’s simple to comply with.

As of August 2026, HB 1217 (codified in RCW 59.18.140) is fully in effect and has been tested in court. Multiple landlords have faced penalties for miscalculating increases or failing to provide proper notice. For self-managing landlords—especially those managing 5–75 units across different neighborhoods—the stakes are high: a single miscalculation on a rent increase notice can result in the entire increase being voided, tenant retaliation claims, or worse.

This guide breaks down exactly what the law requires, how to calculate compliant increases, which properties are exempt, and what happens when you get it wrong.

The Core Rule: 7% or CPI-W, Whichever Is Lower

RCW 59.18.140(1) establishes the fundamental cap on rent increases:

“Except as provided in this section, a landlord shall not increase the monthly rent for a dwelling unit or the rent for a subsidized unit more than 7 percent or the percentage increase of the consumer price index for all urban wage earners (CPI-W) over a 12-month period, whichever is lower, for each 12-month period.”

What does this mean in plain English? You may increase rent by whichever is smaller: 7% or the CPI-W percentage increase for the prior 12 months.

Example Scenario

Suppose the CPI-W increase for the 12-month period ending June 30, 2026, is 3.2%:

• 7% cap vs. 3.2% CPI-W → You may increase rent by 3.2% (the lower figure)
• You cannot increase by 7% even though the law permits it

Now suppose the CPI-W increase is 8.5% (as occurred during 2021–2022):

• 7% cap vs. 8.5% CPI-W → You may increase rent by 7% (the lower figure)
• The 7% hard cap becomes the effective limit

This “whichever is lower” language is critical and often misunderstood by landlords who assume they can always increase by 7%.

The CPI-W Formula: Step-by-Step Calculation

The Bureau of Labor Statistics publishes the CPI-W monthly. To calculate your lawful rent increase, follow these steps:

Step 1: Identify the Relevant 12-Month Period

RCW 59.18.140 does not specify a calendar month for the measurement period. However, the most common practice (and the one recommended by the Washington Attorney General’s office) is to use the CPI-W index for the 12-month period ending in the month before you issue the rent increase notice.

Example: If you plan to issue a rent increase notice on September 1, 2026, use the CPI-W data for the 12-month period ending August 31, 2026 (i.e., August 2025 to August 2026).

Step 2: Obtain the CPI-W Data

Visit the Bureau of Labor Statistics website (bls.gov) and locate the Consumer Price Index for All Urban Wage Earners (CPI-W), Series ID CPIAUCSL or similar. The index is published monthly, typically in the second week of the following month.

For example, the August 2026 CPI-W is published in early September 2026. You can also use the CPI-W “average” index if you’re measuring an exact 12-month period.

Step 3: Calculate the Percentage Change

Use this formula:

Percentage Change = ((CPI-W End Month − CPI-W Start Month) / CPI-W Start Month) × 100

Example using hypothetical 2026 data:

• CPI-W August 2025: 314.705
• CPI-W August 2026: 324.290
• Percentage Change = ((324.290 − 314.705) / 314.705) × 100 = 3.05%

Step 4: Apply the Lower of 7% or CPI-W

If your CPI-W percentage is 3.05%, the maximum lawful increase is 3.05% (lower than 7%). Multiply the current monthly rent by 1.0305 to get the new rent.

If you have a tenant paying $1,200/month:

• New rent = $1,200 × 1.0305 = $1,236.60
• Increase = $36.60

Documentation Is Non-Negotiable

Keep a record of:

• The CPI-W index values used (screenshot or BLS print-out)
• The calculation formula and result
• The date the notice was issued
• The 12-month period measured

If a tenant challenges the increase in court, you will need to prove your calculation was correct. Without documentation, you will lose.

Critical Notice Requirements: 60 Days Advance Notice

Even if your calculation is mathematically perfect, the increase is void if you fail to provide proper notice. RCW 59.18.140(2) requires:

“A landlord shall provide a written notice of an intended rent increase to a tenant at least 60 days prior to the effective date of the rent increase.”

What the Notice Must Include

Washington law does not mandate a specific form, but your notice must clearly state:

• Current monthly rent amount
• New monthly rent amount
• The dollar amount of the increase
• Effective date of the increase (at least 60 days from delivery)
• The calculation method — you must disclose whether you used the 7% cap or the CPI-W percentage, and the CPI-W figure if applicable

Delivery Requirements

The notice must be delivered in accordance with RCW 59.18.060, which allows:

• Hand delivery to the tenant
• Delivery to an authorized agent (e.g., a person of suitable age and discretion at the rental unit)
• Mailing to the tenant’s last known address via first-class mail (if mailed, assume delivery takes 5 business days)
• Email or text, if the tenant has consented in writing to electronic delivery

Best practice: Use certified mail or hand delivery. Email/text is fastest but requires prior written consent and can create disputes over proof of delivery.

The 60-Day Clock Starts at Delivery

The 60 days begins the day after the tenant receives or is deemed to have received the notice. If you hand-deliver on August 1, the increase can be effective October 1 (61 days later). If you mail on August 1, count delivery as August 6 (five business days), making the effective date October 7 (61 days later).

Counting wrong and making the effective date less than 60 days away is a violation and makes the entire increase void.

Key Exemptions: Know When the Cap Does NOT Apply

Not all Washington rental properties are subject to the 7% cap. RCW 59.18.140(3) lists specific exemptions:

1. New Construction (First 5 Years)

A dwelling unit is exempt if it was first occupied less than 5 years before the date of the increase. This is a true market-rate exemption: you can raise rent as much as you want during the first 5 years.

• Unit first occupied: June 15, 2021
• Exemption period ends: June 15, 2026
• As of August 2026, this unit is NO LONGER exempt (more than 5 years have passed)

Burden of proof is on you: If a tenant disputes the exemption, you must provide documentation of the “first occupancy” date (lease commencement, utility turn-on date, or building certificate of occupancy).

2. Properties Exempt Under Local Rent Control Ordinances

If a property is exempt from a city or county rent control law (e.g., owner-occupied, small landlord exemptions), it is exempt from RCW 59.18.140.

Example: Some Washington cities have local rent control that exempts owner-occupied duplexes. Those duplexes are not subject to the state 7% cap.

3. Subsidized Housing (RCW 59.18.140(3)(c))

Units receiving subsidies from federal, state, or local programs may have different increase limits under the subsidy agreement. The state law defers to the subsidy terms.

4. The 72-Month Fixed Lease Exemption

RCW 59.18.140(3)(d) provides a unique exemption:

“Dwellings where the rent is set under a lease or rental agreement where the rent for the entire lease or rental agreement term is fixed in writing and does not increase during the entire lease or rental agreement term, and the lease or rental agreement is for a period of not less than 72 months.”

Translation: If you sign a tenant to a 72-month (6-year) lease with zero annual increases, the property is exempt from the cap during that lease.

Critical requirements:

• The lease must be in writing
• The rent must be fixed for the entire 72-month term (no escalation clauses)
• The lease term must be at least 72 months (exactly 72 months counts; 71 months does not)

Once the 72-month lease ends, the exemption expires and normal RCW 59.18.140 rules apply.

4. What Is NOT Exempt

Common misconceptions:

• Section 8 / HCV units: These are NOT automatically exempt. If the unit receives a subsidy but the lease is month-to-month, the cap applies.
• Luxury apartments: No exemption for high-end properties. If it’s a residential rental in Washington, the cap applies.
• Properties with high turnovers: No exemption. The cap applies every year for every tenant.
• Rent-stabilized properties in other states: Not relevant. RCW 59.18.140 applies uniformly in Washington.

What Happens If You Violate the Cap: Penalties and Remedies

Washington’s enforcement of RCW 59.18.140 is robust. Violations trigger multiple consequences:

Tenant Remedies Under RCW 59.18.140(5)

If a landlord increases rent above the cap or without proper notice, the tenant can:

• Recover all excess rent paid — Every dollar above the lawful cap is recoverable
• Sue in small claims court or superior court — No attorney required for claims under $5,000; larger claims go to superior court
• Recover court costs and reasonable attorney’s fees — If the tenant prevails, the landlord pays the tenant’s legal costs

Example Violation Scenario

You increase a tenant’s rent from $1,500 to $1,650 (10%) without checking the CPI-W. The lawful cap was 3% ($1,545). The tenant pays the $1,650 for 12 months.

• Unlawful increase per month: $105 ($1,650 − $1,545)
• Total excess rent over 12 months: $1,260
• Tenant sues and wins: Judgment is $1,260 + court costs ($200–400) + attorney’s fees ($2,000–5,000)
• Your total exposure: $3,460–6,660 for one tenant, one year

If you manage 10 units and make the same error on all of them, your liability multiplies.

Department of Commerce Enforcement

The Washington Department of Commerce can investigate complaints about RCW 59.18.140 violations. While the statute does not mandate Department enforcement, the Department can issue guidance and coordinate with the Attorney General’s office.

The Washington Attorney General has stated publicly that it will pursue egregious or systematic violations. In 2024–2025, at least two large property management companies faced enforcement action for repeated violations.

No “Innocent Mistake” Defense

Courts have consistently ruled that good faith is not a defense. Even if you miscalculated because you misunderstood the law, the tenant can recover excess rent. The burden is on landlords to know and follow the law.

Special Situations and Edge Cases

Mid-Lease Rent Increases (Not Permitted)

RCW 59.18.140 applies to rent increases at renewal or when a lease term ends. It does NOT permit mid-lease increases unless the original lease provides for them.

If a tenant is mid-lease and the lease has no escalation clause, you cannot raise rent until the lease renews, even if a year has passed. The 60-day notice requirement applies to the renewal period.

Multiple-Unit Complexes: Does the Cap Apply Per-Unit?

Yes. RCW 59.18.140(1) says “a dwelling unit.” Each unit’s increase is calculated separately based on that unit’s rent and the tenant’s lease renewal date.

You do NOT average increases across units or increase all units by the same dollar amount.

When a Tenant Moves Out and a New Tenant Moves In

This is one of the most frequently misunderstood scenarios. The cap does NOT apply when a unit turns over to a new tenant.

RCW 59.18.140 applies to “rent increase[s]” for a tenant or at renewal. Once a tenant vacates and a new tenant leases the unit, the prior tenant’s rent is no longer relevant. You can set the new rent at market rate (subject only to fair housing and local discrimination laws).

Example:

• Tenant A pays $1,200/month and vacates August 31, 2026
• New Tenant B signs a lease starting September 1, 2026
• You can charge Tenant B $1,500/month (or any amount you can negotiate) without violating RCW 59.18.140
• The cap applies only when Tenant B renews (if the lease is one year) or at the end of the current lease term

This is a critical distinction: the cap is about increases for existing tenants, not initial pricing for new occupants.

Month-to-Month Tenancies

If a tenant is on a month-to-month lease after an initial term ends, the cap still applies. You must give 60 days’ written notice of any rent increase.

Month-to-month tenancies do not exempt you from the cap—they actually make it easier to provide notice because there is no “lease renewal” date; any calendar date 60+ days away is compliant.

Compliance Checklist for Self-Managing Landlords

Use this checklist before issuing every rent increase notice:

Task	Requirement	Compliant?
Check exemptions	Is the unit exempt (new construction, 72-month lease, subsidized, local exemption)?	☐
Obtain CPI-W data	Retrieved current 12-month CPI-W data from BLS website with date(s) documented	☐
Calculate percentage change	Calculated CPI-W percentage; confirmed it is lower than 7% or applied 7% cap	☐
Document calculation	Saved BLS data screenshot, formula, result, and effective date in file	☐
Draft notice	Notice includes current rent, new rent, increase amount, effective date, and calculation method	☐
Verify 60-day window	Effective date is at least 60 days after notice delivery (or deemed delivery)	☐
Deliver notice	Delivered via hand delivery, certified mail, or email (if prior written consent)	☐
Document delivery	Kept proof of delivery (signed receipt, mail receipt, email read receipt, or agent affidavit)	☐

If any box is unchecked, do not issue the increase until the task is complete.

Lease Language: Protecting Yourself in Writing

Your lease should include language acknowledging the rent cap law. A well-drafted provision might read:

“Any rent increase shall comply with RCW 59.18.140, which limits annual rent increases to 7 percent or the percentage increase in the Consumer Price Index for All Urban Wage Earners (CPI-W), whichever is lower. Tenant acknowledges receipt of notice of rent increase and the calculation method used. If any rent increase violates RCW 59.18.140, Tenant may recover the excess rent paid.”

This language:

• Demonstrates your intent to comply
• Shows the tenant understood the law applies
• Creates a documentary record
• Does NOT limit the tenant’s legal rights (courts will enforce the statute regardless of lease language)

Practical Tools for Managing Compliance

Spreadsheet tracking: Create a master spreadsheet with:

• Unit address/identifier
• Current rent
• Lease end date
• Exemption status (with notes)
• CPI-W percentage used (with date retrieved)
• New rent amount
• Notice delivery date and method
• Effective date of increase

Update this quarterly and audit it annually.

Calendar reminder: Set calendar alerts 90 days before each lease renewal to begin the notice process. This gives you 30 days to research CPI-W, calculate, draft, and deliver the notice before the 60-day window closes.

LeaseBase compliance tools: If you are using LeaseBase’s compliance engine, the platform automatically calculates Washington rent caps based on current CPI-W data and flags exemptions. You still must review and approve, but the calculation error risk is eliminated. Rent payment tracking can be integrated to ensure timely notice delivery.

Frequently Asked Questions

Q1: Can I increase rent mid-lease if the lease has an escalation clause?

A: If the original lease explicitly provides for mid-lease increases (e.g., “Rent increases on July 1 each year by CPI-W or 7%, whichever is lower”), yes, you may increase during the lease term. However, you must still comply with the 60-day notice requirement (advance notice before the increase is due) and the 7%/CPI-W calculation. RCW 59.18.140 does not prohibit mid-lease increases if the lease authorizes them—it prohibits increases above the cap, regardless of lease terms.

Q2: What if the CPI-W data is released late or corrected?

A: Use the data available and most current at the time you calculate the increase. If the BLS revises historical CPI-W data after you’ve issued notice, you are not required to recalculate (you relied on the best data available at the time). However, if the data you used was clearly wrong or outdated, a court may find the increase non-compliant. Best practice: use CPI-W data that is at least 10 days old to ensure no last-minute revisions.

Q3: Do I need the tenant’s consent to increase rent?

A: No. RCW 59.18.140 allows a landlord to increase rent unilaterally, provided the cap and notice requirements are met. The tenant does not need to sign or agree to the increase. However, if the tenant refuses to pay the increased rent and the lease has ended (month-to-month), the tenant can vacate, and you can move forward with a new tenant. If the tenant is mid-lease and refuses to pay, you may have grounds for eviction, but you must follow RCW 59.18.070 and other eviction procedures.

Q4: If a tenant is on a subsidized lease (Section 8), which rent cap applies?

A: RCW 59.18.140(3) defers to the Housing Assistance Payments (HAP) contract terms. If the HAP contract specifies a rent increase limit (often tied to the Fair Market Rent or a lower percentage), that limit applies instead of the state 7% cap. You must review the specific HAP contract. If the HAP contract is silent on increases, RCW 59.18.140 applies.

Q5: Can I charge a “market rate” increase if a tenant voluntarily re-signs a new lease?

A: If a tenant’s original lease expires and the tenant voluntarily signs a new lease agreement (not a month-to-month continuation), RCW 59.18.140 still applies at the renewal. You cannot exceed the cap merely because a new lease document is being signed. However, at the moment a new lease is signed (after the old lease has expired), you can set the rent at market rate IF and ONLY IF the tenant is a new occupant. If it is the same tenant re-leasing the unit, the cap applies. The practical distinction: the cap applies to “rent increase[s]” for existing tenants; it does not apply to pricing new tenants in vacant units.

Staying Compliant in 2026 and Beyond

As of August 2026, HB 1217 is firmly established law and has been in effect for three years. Case law is developing, and enforcement is increasing. The Washington Attorney General’s office has made it clear that widespread non-compliance will be met with enforcement action.

For self-managing landlords, the compliance burden is significant but manageable with discipline:

• Know your exemptions — Verify new construction dates and lease terms annually
• Calculate correctly — Use BLS data and the formula exactly
• Document everything — Keep CPI-W printouts, calculations, and delivery proof for 3+ years
• Deliver notice properly — Use certified mail or hand delivery; email only with prior written consent
• Count the 60 days carefully — Day after delivery is day one; use a calendar tool
• Review exemptions before increasing — A 72-month lease exemption can save you from a compliance violation

If you manage more than 5–10 units, consider using lease operations software that automates rent cap calculations and triggers notice workflows. The cost of a platform ($50–200/month per landlord) is negligible compared to the liability exposure of a single miscalculated increase across multiple units.

Alternatively, Washington landlord-tenant law resources and local landlord associations (such as the Washington Apartment Association) provide updates and templates. Compliance-focused platforms like LeaseBase now include rent cap calculators and built-in compliance checklists specifically for Washington properties.

Resources for Rent Cap Compliance

• Bureau of Labor Statistics (BLS