Washington State Rental Law Changes King County Landlords Need to Know | Valta Homes Blog
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Washington State Rental Law Changes King County Landlords Need to Know
Key Washington state rental law changes affecting King County landlords in 2026. Updated rules on rent increases, evictions, security deposits, and tenant screening that every small landlord must follow.
If you own one to three rental properties in King County, staying current on Washington state rental laws is not optional. It is the difference between running a smooth operation and facing fines, lawsuits, or forced payouts to tenants.
Washington has passed more landlord-tenant legislation in the last three years than in the previous decade combined. Some of these changes affect how much notice you give before raising rent. Others change what you can charge for security deposits, how you screen tenants, and what counts as a legal reason to end a lease.
We put together this guide because our team at Valta Homes works with King County landlords every day. We hear the same questions over and over: "Can I still do that?" and "When did that change?" Here is what you need to know right now.
Correction (September 2026): An earlier version of this article stated that Washington requires 180 days of notice before a rent increase, statewide. That was wrong. The statewide minimum is 90 days under RCW 59.18.140. The 180-day requirement is a City of Seattle rule and applies only inside Seattle city limits. The section below has been corrected, and a section on the statewide rent cap has been added.
The Rent Cap: 9.683% in 2026, 10% in 2027
This is the single biggest change to Washington rental law in a decade, and it took effect in 2025 under HB 1217.
Rent cannot be increased at all during the first 12 months of a tenancy (RCW 59.18.700). After the first year, any increase in a 12-month period is limited to 7% plus CPI, or 10%, whichever is less.
The Washington Department of Commerce calculates and publishes the maximum each year from the June Seattle-area Consumer Price Index:
Period
Maximum increase
1 Jan 2026 – 31 Dec 2026
9.683%
1 Jan 2027 – 31 Dec 2027
10%
The 2027 figure is already published. The raw calculation came out above 11%, so the 10% ceiling is what binds.
Certain properties are exempt under RCW 59.18.710, including some newer construction. Check whether yours qualifies before assuming the cap applies. Our full breakdown is in Washington's 2026 rent increase cap.
Rent Increase Notice: 90 Days Statewide, 180 Days in Seattle
Washington requires at least 90 days of written notice before a rent increase takes effect, for any increase, in any amount (RCW 59.18.140). This replaced the older 60-day rule.
If your rental is inside Seattle city limits, the requirement is 180 days, regardless of the amount. That is a City of Seattle ordinance, in place since late 2021, and it does not apply elsewhere in King County.
Brain or Hands: Self-Managing Landlords Can't Do Both Well
Self-managing landlords in King County juggle repairs and strategy at once. Here's why brain and hand work compete, and how Valta clears the decision load.
A Bellevue or Issaquah landlord works off the 90-day clock. A Seattle landlord works off 180 days. Mixing them up is one of the easiest and most expensive mistakes to make, because an improperly noticed increase is not enforceable.
Here is what this means in practice:
Plan rent increases at least a full quarter out, and half a year out in Seattle. If you are budgeting for annual maintenance costs, factor in the gap between deciding on an increase and it taking effect.
Written notice must be delivered properly. Hand delivery, first-class mail, or posting on the door with a mailed copy are all acceptable. Text messages and emails alone do not count unless your lease specifically allows electronic notice.
The notice must state the exact new rent amount. Vague language like "rent will increase" without a number does not meet the legal standard.
Check your own city. Several King County cities have adopted notice periods longer than the state minimum. Where state and local rules differ, the stricter one governs.
For landlords managing rental turnovers, this timeline matters. If a tenant leaves because of a rent increase, you need enough lead time to prepare the unit, handle repairs, and find a new tenant without a long vacancy.
Just Cause Eviction: You Need a Legal Reason to End Any Tenancy
Washington's just cause eviction law means you cannot simply choose not to renew a lease or end a month-to-month tenancy without a specific legal reason. This applies to all residential landlords statewide.
The approved reasons for ending a tenancy include:
Nonpayment of rent (with proper notice and cure period)
Lease violations (after written notice and opportunity to fix the problem)
Owner move-in (you or an immediate family member intends to occupy the unit for at least 12 months)
Major renovation that requires the unit to be vacant and that has received proper permits
Sale of the property to a buyer who intends to occupy it
Demolition of the unit
What you cannot do:
End a tenancy because you want to raise rent above what the current tenant will pay
Refuse to renew a lease without stating a qualifying reason
Retaliate against a tenant who reported a code violation or exercised a legal right
This law has real teeth. If a court finds that you terminated a tenancy without just cause, you could owe the tenant three months' rent plus attorney fees.
For landlords dealing with tenant turnover, the practical takeaway is clear: investing in tenant retention through responsive maintenance and fair treatment is now a legal strategy, not just a nice-to-have.
Security Deposit Limits and Return Timelines
Washington has tightened the rules around security deposits significantly. Here is the current framework:
Deposit limits:
For unfurnished units, the security deposit cannot exceed one month's rent
For furnished units, the limit is one and a half months' rent
Any nonrefundable fees must be clearly labeled as nonrefundable in writing at the time of collection
You cannot collect a deposit at all unless there is a written rental agreement and a signed written checklist describing the condition of the unit
Return timeline:
You must return the deposit (or provide an itemized statement of deductions) within 21 days of the tenant vacating
The itemized statement must include receipts or good-faith estimates for each deduction
If you fail to provide the statement within 21 days, you may forfeit the right to withhold any portion of the deposit, and a court may award the tenant up to twice the deposit
What you can deduct:
Unpaid rent
Damage beyond normal wear and tear
Cleaning costs if the tenant left the unit in worse condition than when they moved in (documented with move-in and move-out inspection reports)
What you cannot deduct:
Normal wear and tear (paint fading, carpet wear from normal use, minor scuffs)
Charges for cleaning if the unit was returned in the same condition
Repairs for pre-existing conditions you did not document at move-in
The move-in inspection is your best protection here. Documenting the condition of flooring, paint, appliances, and fixtures with dated photos at move-in gives you a clear baseline for any deduction claims at move-out.
Tenant Screening: New Limits on What You Can Consider
Washington and several King County jurisdictions have placed new restrictions on the tenant screening process.
Source of income discrimination is illegal. You cannot reject a tenant because their income comes from Section 8 vouchers, Social Security, veterans' benefits, child support, or any other lawful source. King County and most Eastside cities enforce this aggressively.
Criminal history screening is restricted. Under Seattle and some other local ordinances:
You cannot ask about arrests that did not lead to conviction
You cannot use criminal history as an automatic disqualifier
If you do consider criminal history, you must conduct an individualized assessment that weighs the nature of the offense, how long ago it occurred, and whether it is relevant to the tenancy
You must notify the applicant in writing if criminal history is a factor in your decision and give them a chance to respond
Application fee limits: You can only charge what it actually costs to run the screening. Inflated application fees designed to generate income are not allowed. Keep receipts from your screening service to justify the amount.
For landlords who want to vet contractors and tenants with equal rigor, the key is having a consistent, documented process that treats every applicant the same way.
Mold Disclosure and Remediation Requirements
Washington requires landlords to maintain habitable conditions, and mold is squarely within that obligation. While there is no single "mold law" on the books, the implied warranty of habitability and various health codes create clear requirements:
You must respond to tenant mold complaints promptly. Ignoring a mold report or delaying action can lead to liability for health impacts and property damage.
If mold is present due to a building defect (roof leak, plumbing issue, poor ventilation), the landlord is responsible for both the remediation and the underlying repair.
You must disclose known mold issues to prospective tenants before they sign a lease.
We have seen this play out firsthand. At a rental property in Issaquah, a roof leak led to hidden mold that required professional mold remediation. The total cost was significantly higher than what a proactive roof maintenance program would have cost over several years.
Our complete guide to mold in Washington rental properties covers the full scope of landlord responsibilities, but the legal bottom line is this: fix moisture problems before they become mold problems, and document everything.
Required Maintenance and Habitability Standards
Washington's implied warranty of habitability requires landlords to maintain rental properties to specific standards. Failing to meet these standards gives tenants legal remedies including rent withholding, repair-and-deduct, and lease termination.
The property must have:
Functioning heating capable of maintaining 65 degrees Fahrenheit. If your HVAC system fails in winter, this is an emergency repair, not something that can wait.
Hot and cold running water with a functioning water heater
Working plumbing including toilets, sinks, and drains. Chronic drain issues that you ignore can become a habitability claim.
Weatherproofing including intact roofing, windows, and doors
Working smoke detectors and carbon monoxide alarms on every level and in every bedroom
Functioning locks on all exterior doors and windows
The standard is not perfection. Normal wear happens. But when a system fails or a condition makes the unit unsafe or unsanitary, you have an obligation to act quickly. Having a year-round maintenance calendar and understanding what deferred maintenance really costs are the best ways to stay compliant without scrambling.
Emergency Repair Obligations
Washington law treats certain repairs as emergencies that require immediate response:
No heat when outdoor temperatures are below 58 degrees Fahrenheit
No running water or hot water
Sewage backup or flooding
Electrical hazards
Gas leaks
Broken locks on exterior doors
Fire damage that makes the unit unsafe
If you do not respond to an emergency within 24 hours, the tenant has the right to arrange the repair themselves and deduct the cost from rent (up to one month's rent per incident). They can also pursue legal action for damages.
If you manage your own properties, at minimum keep a list of licensed contractors who can respond within 24 hours. Our guide on how to handle multiple repairs at once covers triage strategies that help you respond faster.
Notice Requirements: A Quick Reference
Washington has specific notice periods for different situations. Getting these wrong can invalidate your action entirely:
Situation
Required Notice
Rent increase, statewide
90 days written notice
Rent increase, inside Seattle
180 days written notice
Lease violation (curable)
10 days to cure
Nonpayment of rent
14 days pay-or-vacate
Month-to-month termination (just cause)
20 days
Lease non-renewal (just cause)
60 days before lease end
Entry for repairs/inspection
48 hours (2 days)
Entry for showing to prospective tenants
24 hours
Security deposit return
21 days after vacating
Every one of these notice periods must be followed precisely. A 13-day pay-or-vacate notice instead of 14 days can get your eviction case thrown out.
Local King County Rules That Stack on Top
Washington state law is the floor, not the ceiling. Several King County cities have additional protections:
Seattle:
180-day notice for any rent increase
First-in-time tenant screening rule (must offer the unit to the first qualified applicant)
Fair Chance Housing restrictions on the use of criminal history
Limits on move-in fees (can be spread over installments)
Mandatory relocation assistance for certain no-fault evictions
Winter eviction moratorium considerations
Burien, Federal Way, Kenmore, and other cities have adopted or are considering their own just cause eviction and tenant protection ordinances. The trend is toward more regulation, not less.
Unincorporated King County follows state law plus county-level regulations on source of income discrimination and other protections.
If your rental is in a specific city, check that city's municipal code in addition to state law. When in doubt, follow the stricter standard.
Practical Steps to Stay Compliant
Here is what we recommend to every landlord we work with:
Audit your lease agreement annually. Make sure your lease reflects current law. Clauses that were legal three years ago may not be enforceable today.
Document everything. Move-in inspections, maintenance requests, repair completions, notice deliveries. If it is not documented, it did not happen.
Respond to maintenance requests in writing and within 24 hours. Even if the repair takes longer, acknowledging the request and providing a timeline protects you.
Keep your screening process consistent. Use the same criteria for every applicant. Document why you accepted or denied each one.
Plan rent increases early. With a 90-day statewide notice period, and 180 days in Seattle, decide next year's rent by early autumn at the latest. Check the amount against that year's published cap before you serve anything.
Get professional help for complex situations. Evictions, mold remediation, major repairs, and tenant disputes all have legal implications. The cost of a property management consultation or attorney review is a fraction of what a misstep costs.
How Valta Homes Helps King County Landlords Stay Compliant
We built our membership program specifically for landlords with one to three properties who do not have the time or team to stay on top of every maintenance requirement and legal deadline.
Our members get:
24/7 emergency maintenance response so you never miss a legally required repair timeline
Vendor management so you are not scrambling to find a licensed plumber or electrician at midnight
Documentation of every repair, inspection, and maintenance visit
Whether you need a one-time plumbing repair, a full kitchen and bathroom remodel, or ongoing property maintenance, our team handles it so you can focus on the business side of being a landlord.
The Bottom Line
Washington state rental law has shifted significantly toward tenant protection. That is not going to reverse. As a landlord, your best strategy is to know the rules, follow them precisely, and run your property well enough that legal compliance is a byproduct of good management rather than a separate task.
The numbers to remember: 9.683% is the 2026 cap, 10% is the 2027 cap, 90 days is the statewide notice period, 180 days inside Seattle, and 21 days is the deposit clock.
Maintain your property. Respond to tenants quickly. Document everything. Plan ahead.
This guide is general information, not legal advice. For a specific dispute, talk to a Washington landlord-tenant attorney.
If you have questions about how these laws affect your specific situation, or if you need help getting your rental property up to standard, contact us or call (425) 800-8268. We work with King County landlords every day, and we are here to help.
