New Washington Rental Laws 2026: What Owners Must Know

The new Washington rental laws for 2026 center on the state's rent stabilization program, now fully operational. Most rent increases this calendar year are capped at 9.683%, require at least 90 days written notice, and are banned entirely during a tenant's first 12 months.

The 2026 legislative session added new rules on notice delivery, portable cooling devices, flood disclosures, and smart access systems. Here is what every Puget Sound rental property owner needs to know, and do, before the next renewal cycle.

New Washington Rental Laws in 2026: The State of Play

The biggest story for 2026 is not a new bill. It is the 2025 rent stabilization law, codified at RCW 59.18.700, completing its first full calendar year in operation. Every renewal and every rent increase you serve this year runs through it.

The core mechanics work like this:

• No increase in the first 12 months. Rent cannot go up at all during the first year of a tenancy, regardless of what the lease says.
• Annual cap after that. Within any 12-month period, increases are limited to 7% plus the Seattle-area consumer price index, or 10%, whichever is less.
• The 2026 number is 9.683%. The Washington Department of Commerce publishes the exact maximum each year, and it announced 9.683% as the cap in effect from January 1 through December 31, 2026.
• 90 days written notice, statewide. Under RCW 59.18.140, any rent increase requires at least 90 days advance written notice, and the increase can only take effect at the end of the lease term. Tenancies subsidized based on income require 30 days notice.
• Vacancy resets the cap. When a tenant moves out, you may set the new rent at whatever the market supports. The cap governs increases within an existing tenancy, not between tenancies.

Commerce publishes the following year's maximum shortly after the federal Bureau of Labor Statistics releases June CPI data in mid-July. Put that on your calendar; the 2027 number will arrive this summer and should drive your renewal planning for next year.

Seattle owners carry an additional layer on top of state law, including 180 days advance written notice for rent increases and the RRIO registration program. If you own inside city limits, verify Seattle's current requirements before serving any notice.

Exemptions, Parity, and Penalties Under the Rent Cap

Not every property is subject to the cap. RCW 59.18.710 exempts several categories that matter to small portfolio owners:

• Properties whose first certificate of occupancy was issued 12 or fewer years ago
• Public or nonprofit affordable housing
• Owner-occupied homes where the tenant shares a kitchen or bathroom with the owner
• Owner-occupied single-family properties renting out no more than two units or bedrooms, including an ADU or DADU
• Owner-occupied duplexes, triplexes, and fourplexes where the owner lives in one unit

Two details trip owners up:

• The exemptions are unavailable if the owner is a real estate investment trust, a corporation, or an LLC with a corporate member.
• If you claim an exemption, your rent increase notice must state the facts supporting it.

An exempt property with a defective notice is still a compliance problem.

The law also includes a parity rule: the rent for a month-to-month tenancy may not exceed the rent for a comparable fixed-term tenancy by more than 5%. Owners can no longer use a steep month-to-month premium to push tenants into renewal.

Penalties for exceeding the cap

Penalties are significant, so do not test this statute. A tenant charged above the cap can recover the excess rent paid, damages of up to three months rent, and attorney fees, and may terminate the tenancy with 20 days notice. The attorney general can also enforce the law.

New Washington Rental Laws Passed in the 2026 Session

The Legislature's 2026 session, which ran from January to March, did not produce another headline rent law. After 2025's overhaul, lawmakers passed a handful of narrower measures that residential owners should still have on their radar. All four below are confirmed in the Legislature's official 2026 Summary of Legislation.

Notice delivery: certified mail no longer required (HB 2664)

Effective June 11, 2026, the certified mail requirement for unlawful detainer notices, and other notices served in the same manner, is removed from RCW 59.12.040.

When you cannot serve a tenant personally and instead leave the notice with someone of suitable age at the residence, you must still mail a copy, but regular first-class mail now satisfies the law. This is a genuine simplification; keep proof of mailing as a matter of practice.

Portable cooling devices (ESSB 6200)

Also effective June 11, 2026, landlords generally cannot prohibit tenants from installing a portable cooling device such as a window air conditioning unit or portable heat pump, and cannot charge a fee for its use, inspection, or installation.

Exceptions are narrow. They apply where the owner already provides a fully operational heat pump, or where installation would:

• violate building codes or manufacturer safety guidelines;
• cause unreasonable damage;
• exceed the building's electrical capacity; or
• block a window needed as an emergency exit.

You can still charge for actual damage caused by installation or use.

Flood risk disclosure (SSB 6237)

For leases entered into after December 31, 2026, owners must disclose:

• whether the property sits in a special flood hazard area or an area of potential flooding;
• that the owner's insurance does not cover the tenant's personal possessions; and
• that the tenant should consider renter's and flood insurance.

This amends the landlord duties statute, RCW 59.18.060. If you have properties near rivers or in mapped flood zones anywhere in the Puget Sound region, start gathering that documentation now.

Smart access systems (ESSB 5937)

Starting January 1, 2027, buildings using smart access systems, meaning entry by RFID card, mobile app, or biometric identifiers, must offer tenants who ask an alternative method of entry such as a physical key, fob, or manual keypad code.

Owners must also provide a written privacy policy describing what data the system collects, how it is safeguarded, how long it is retained, and what happens if it is disclosed, and must limit data collection to the minimum needed. Manual code keypads are not considered smart access systems.

The Compliance Stack: Recent Rules Owners Are Still Catching Up On

In our work across 30+ Puget Sound cities, the violations we see most often are not the new laws. They are the recent ones owners never fully adopted. Three deserve a self-audit this year.

Security deposit documentation (RCW 59.18.280, updated 2023)

Within 30 days of move-out you must refund the deposit or deliver an itemized statement, and the statement must include supporting documentation: invoices, estimates, or receipts for the work claimed.

You cannot deduct for ordinary wear and tear, for carpet cleaning without documented cost, or for damage to items that never appeared on the move-in checklist. No compliant move-in condition report means no defensible deductions. Our guide to security deposits in Washington walks through the full process.

Screening notices (RCW 59.18.257)

Before screening any applicant, you must give written notice of:

• what information you will access;
• your criteria for denial;
• the consumer reporting agency you use; and
• whether you accept comprehensive reusable screening reports.

You may only charge a screening fee if that notice was given first, and any denial or adverse action requires a written notice in the statutory format. See our overview of tenant screening rules in Washington State for the details.

Source of income protection (RCW 59.18.255)

Source of income is protected statewide. You cannot reject an applicant for using a housing voucher or other subsidy, and when applying an income-to-rent ratio you must subtract the subsidy from the rent before calculating.

A violation can cost up to 4.5 times the monthly rent plus court costs and fees, which makes this one of the most expensive screening mistakes available.

What to Do Before Your Next Renewal Cycle

Here is the checklist we run for owners ahead of every renewal wave:

• Confirm the current cap. For increases taking effect in 2026, the maximum is 9.683% unless your property qualifies for an exemption.
• Verify the tenancy is past 12 months. No increase of any size is allowed during the first year.
• Calendar the 90 days. Count backward from the lease end date; in Seattle, count 180. A late notice means waiting another cycle.
• Use the correct notice form. If you claim an exemption, the notice must state the supporting facts.
• Check parity. Make sure month-to-month rent does not exceed comparable fixed-term rent by more than 5%.
• Audit your deposit file. Move-in checklist signed, photos dated, receipts organized for any future deductions.
• Update screening packets. Written criteria, agency disclosure, reusable report policy, adverse action template.
• Prepare for the new disclosures. Flood risk language for leases signed after December 31, 2026, and smart access policies before January 1, 2027.

If that list feels heavy, that is because the compliance burden has roughly doubled in three years. Our full Washington landlord tenant law compliance guide covers each requirement in depth, and our walkthrough of lease renewal and rent increase notices in Washington covers the notice mechanics step by step.

What to Watch for 2027

Two 2026-session laws have delayed effective dates that land in your 2027 planning window: the flood disclosure requirement applies to leases entered after December 31, 2026, and the smart access rules begin January 1, 2027.

Beyond that, expect the Department of Commerce to publish the 2027 maximum increase percentage in mid-July 2026, after June CPI data is released. Because the cap formula is 7% plus Seattle-area CPI with a hard ceiling of 10%, the published number moves with inflation each year. The rent stabilization statute itself remains in place through 2040 unless the Legislature amends it.

Housing remains a top legislative priority in both chambers, so assume the 2027 session will bring further proposals affecting residential owners. We track each session and update this roundup annually.

Frequently Asked Questions

What is the maximum rent increase in Washington for 2026?

For properties subject to RCW 59.18.700, the maximum increase within any 12-month period in 2026 is 9.683%, as published by the Department of Commerce. Exempt properties, such as buildings 12 or fewer years old and certain owner-occupied properties, are not bound by the cap but still owe proper notice.

Do the new Washington rental laws for 2026 change eviction notice service?

Yes. Effective June 11, 2026, HB 2664 removed the certified mail requirement for unlawful detainer notices and notices served the same way. When serving by substitute service, you must still mail a copy, but regular first-class mail now qualifies.

Can I raise rent when a tenant moves out?

Yes. The cap applies within a tenancy, not between tenancies. When a unit turns over, you may set the new rent at market without restriction, which makes accurate market pricing at turnover more valuable than ever.

Does the rent cap apply to my owner-occupied duplex?

Generally no. RCW 59.18.710 exempts owner-occupied duplexes, triplexes, and fourplexes, along with several other categories. The exemption is lost if the owner is a corporation, REIT, or LLC with a corporate member, and any notice claiming the exemption must state the supporting facts.

When do I need to start giving flood disclosures?

SSB 6237 applies to leases entered into after December 31, 2026. You will need to disclose flood hazard status, note that your insurance does not cover tenant belongings, and recommend renter's and flood insurance.

This article is general information for Washington rental property owners, not legal advice. For decisions on a specific tenancy or dispute, consult a landlord-tenant attorney.

How Sagareus Handles Local Registration and Licensing

Register and license every property with its city, keep it renewed, and pass the required inspections, so you never have to track which city requires what. Across the Puget Sound, the rules change at every city line. What we do for each property we manage:

• Register the property with its city. Many cities, including Seattle, Renton, Kent, Tukwila, Kirkland, and Burien, require a rental registration or business license to operate a property as rental housing, and the rules vary by city.
• Keep it current. Some cities renew every year, others every two; we track each expiration and renew on time, so a registration never lapses on your watch.
• Handle the required inspections. Where a city mandates periodic inspection, we coordinate a licensed inspector, schedule access with respect for your residents, and see any required repairs through to sign-off.

You pay the city's fees; we handle the tracking, filing, and follow-up, so the registration never lapses on your watch.

This is the invisible compliance work that quietly catches self-managing owners off guard, and exactly where local expertise pays for itself.

Related Sagareus Services:

• Professional Leasing Services
• Tenant Screening Services