How to Send a Rent Increase Notice in Washington State (Step-by-Step)

Before You Begin: What You Need

Before preparing a rent increase notice, gather the following information:

• Current rent amount for the unit
• Proposed new rent amount (verified against the HB 1217 cap)
• Desired effective date for the increase
• Tenant name(s) — all financially responsible tenants on the lease
• Tenant mailing address (typically the rental unit address)
• Property details — address, city (to check Tacoma jurisdiction), and construction date (for rent cap exemption analysis)
• Current CPI-U for the Seattle-Tacoma-Bellevue MSA (for rent cap disclosure)
• Lease type — month-to-month or fixed-term (and if fixed-term, when it expires)

Step 1: Calculate Your Timeline

The first and most critical step is working backward from your desired effective date to determine when the notice must be mailed.

The Math

Effective date minus 95 days = Latest mailing date

The 95 days come from:

• 90 days: Statutory notice period (RCW 59.18.140)
• 5 days: Additional time for mailed service (RCW 59.12.040)

Timeline Examples

Tacoma Properties: Earlier Deadline

If the property is in Tacoma, you must also send a 180-day TMC 1.95 notice in addition to the 95-day state notice. This means your planning timeline starts much earlier. See our Tacoma rent increase notice guide for the full dual-notice workflow.

Step 2: Verify the Rent Cap (HB 1217)

Before finalizing your new rent amount, verify that the proposed increase complies with Washington's rent cap.

Check Exemption Status

First, determine if your property is subject to the cap:

1. Look up the certificate of occupancy date — if after February 1, 2005, the property may be exempt
2. Count the units — properties with fewer than 4 units may qualify for exemption
3. Check for subsidized status — government-controlled rents are exempt
4. Owner-occupied ADU — if you live in the main home and rent the ADU, the ADU may be exempt

Calculate the Maximum

If the property is subject to the cap:

1. Find the current CPI-U for Seattle-Tacoma-Bellevue from the Bureau of Labor Statistics
2. Add 7% + CPI-U
3. If the result exceeds 10%, the maximum is 10%
4. Multiply the current rent by the maximum percentage to find the ceiling

Example: Current rent $1,500, CPI-U 2.5%

• Maximum: 7% + 2.5% = 9.5%
• Maximum increase: $1,500 x 9.5% = $142.50
• Maximum new rent: $1,642.50

For a detailed breakdown of the rent cap, see our HB 1217 rent cap guide.

Step 3: Prepare the Statutory Notice Form

Washington law (RCW 59.18.720) specifies what must be included in a rent increase notice. Using a generic "rent increase letter" is risky — it may omit required disclosures and be deemed legally deficient.

Required Content

The statutory form must include:

1. Landlord information — name, address, contact information
2. Property address — the rental unit address
3. Tenant name(s) — all financially responsible tenants on the lease
4. Current rent amount
5. New rent amount — the proposed increased rent
6. Dollar amount of the increase
7. Percentage of the increase
8. Effective date — when the new rent takes effect
9. Rent cap disclosure — the CPI-U rate used, the maximum allowable percentage, whether the property is exempt, and the basis for exemption
10. Tenant rights information — notice of tenant rights under state law
11. Relocation assistance information — disclosure of potential relocation assistance eligibility (especially relevant for Tacoma properties with increases over 5%)
12. Landlord signature — the notice must be signed by the landlord or their authorized agent

Addressing the Notice

For leases with multiple tenants, you have two approaches:

Combined notice: One notice addressed to all tenants (e.g., "John Smith AND Jane Smith"). One certified mailing, lower cost, but potentially weaker legal service.

Individual notices (recommended): Separate notice to each financially responsible tenant. Each gets their own certified mail tracking number and return receipt. Stronger legal defensibility — each tenant is individually and unambiguously served.

Step 4: Sign the Notice

The notice must be signed by the landlord or their authorized agent before mailing. Washington accepts several signature methods:

Signature Options

If you manage multiple properties, having a digital signature on file streamlines the process significantly. The signature should be placed in the designated signature area of the statutory form.

Who Can Sign

• The property owner
• A licensed property manager authorized to act on the owner's behalf
• An authorized agent with written authorization (power of attorney or management agreement)

The signer must have actual authority to impose the rent increase. A maintenance worker or leasing agent without management authority should not sign rent increase notices.

Step 5: Send via Certified Mail from Washington State

This is the step where HB 1003 compliance matters most. The notice must be sent via USPS Certified Mail with a Washington State postmark.

At the Post Office

If you're handling this yourself at a USPS location within Washington:

1. Bring the signed notice in a sealed envelope addressed to the tenant
2. Request Certified Mail service (PS Form 3800)
3. Optionally add Return Receipt (PS Form 3811) — recommended but not required
4. Keep the certified mail receipt showing the article number and postmark date
5. The postal clerk will postmark the receipt — this is your proof of timely mailing

Certified Mail Options

Out-of-State Landlords

If you live or work outside Washington State, you cannot simply mail the notice from your location. HB 1003 requires a Washington postmark. Your options:

1. Use a Washington-based mailing service — services like NoticePM handle the entire process, including posting from within WA
2. Mail during a trip to Washington — if you visit the property, bring the signed notices and mail from a local post office
3. Designate a Washington-based agent — a local property manager or attorney can mail on your behalf
4. Use your WA property manager — if you use a WA-based PM company, they can handle mailing

For a deep dive into the certified mail requirement, see our certified mail guide.

Step 6: Track Delivery

After mailing, track each notice through the USPS system:

What to Track

• Mailing date — your certified mail receipt shows the postmark
• USPS tracking number — from the certified mail receipt
• Delivery confirmation — USPS will show when the item was delivered or attempted
• Return receipt — if you opted for return receipt, you'll receive the signed green card back (or electronic notification)

Delivery Scenarios

Step 7: Retain Records

Documentation is your best defense if a tenant ever challenges a rent increase. Retain the following records for at least 3 years (longer is better):

Common Mistakes to Avoid

Mistake 1: Sending the Notice Too Late

This is the most common and most costly mistake. If you mail the notice 93 days before the effective date instead of 95, the increase is not properly noticed. The tenant can challenge it, and you may need to re-serve and push the effective date out.

Prevention: Build a 5-7 day buffer into your timeline. Mail at 100+ days when possible.

Mistake 2: Using a Generic Letter

A "Dear Tenant, your rent is going up" letter missing the RCW 59.18.720 required disclosures can be challenged as a legally deficient notice. Use the statutory form.

Prevention: Use a compliance tool like NoticePM that generates the statutory form automatically, or work from the official template.

Mistake 3: Exceeding the Rent Cap

With HB 1217 relatively new, many landlords are still unfamiliar with the cap or make calculation errors. An increase exceeding the cap is void for the excess amount.

Prevention: Always look up the current CPI-U and run the formula before setting your new rent. Document your calculation.

Mistake 4: Forgetting the Second Tacoma Notice

Tacoma landlords who send only the 180-day notice or only the 95-day notice are missing half the requirement. Both are required.

Prevention: If your property is in Tacoma, build both notices into your workflow from the start.

Mistake 5: Mailing from the Wrong State

Out-of-state landlords who mail notices from their home state risk having the service challenged under HB 1003.

Prevention: Use a Washington-based mailing service or mail from a WA post office.

Mistake 6: Not Tracking Delivery

Sending the notice and assuming it arrived is insufficient. Without delivery confirmation, you have no proof of service if challenged.

Prevention: Use USPS Certified Mail tracking and, ideally, return receipt service.

Delivery Method Comparison

How NoticePM Streamlines This Process

Each step above involves research, calculation, form preparation, and logistics. NoticePM collapses this entire workflow into a few clicks:

• Automatic timeline calculation — enter your desired effective date, and NoticePM calculates the mailing deadline with buffer
• Rent cap verification — enter the proposed rent, and NoticePM checks it against the current HB 1217 maximum
• Statutory form generation — all required fields and disclosures are pre-filled from your property and lease data
• Digital signature — sign notices directly in the platform
• Certified mail from Washington — notices are posted from within WA via SendCertifiedMail.com with full tracking
• Delivery tracking dashboard — monitor every notice from mailing through delivery with chain of custody documentation
• Record retention — all notices, receipts, and tracking data are stored permanently in your compliance vault