Washington's 2026 Rent Increase Cap (9.683%): What King County Landlords Must Know About HB 1217 | Valta Homes Blog
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Washington's 2026 Rent Increase Cap (9.683%): What King County Landlords Must Know About HB 1217
Washington's 2026 rent increase cap is 9.683% under HB 1217. Here is what King County landlords with 1-3 rentals must know about the limit, exemptions, notice rules, and penalties.
If you own one, two, or three rental properties in King County, the single most important number for your 2026 budgeting is not your mortgage rate or your property tax bill. It is 9.683 percent. That is the maximum amount you are legally allowed to raise the rent on most existing tenancies in Washington this calendar year, and it comes directly from the state's first-ever statewide rent stabilization law.
We coordinate maintenance and renovations for small landlords across Bellevue, Issaquah, Mercer Island, Kirkland, and Seattle, and the question we field most often this year is some version of "wait, can I even raise the rent anymore?" The short answer is yes. The longer answer is that the rules changed in a meaningful way in 2025, the penalties for getting it wrong are real, and Seattle landlords have a second layer of rules stacked on top of the state law. This guide walks through exactly what changed, the numbers that apply right now, and the specific compliance steps that keep a routine rent increase from turning into a legal headache.
In May 2025, Governor Bob Ferguson signed House Bill 1217 into law, making Washington one of a small group of states with statewide rent regulation. The law took effect immediately upon signing on May 7, 2025, according to the Washington State Legislature's bill summary.
The core of the law is a cap on how much you can raise rent during any 12-month period of an existing tenancy. Per the Washington State Department of Commerce HB 1217 Landlord Resource Center, the formula is 7 percent plus the Consumer Price Index, or 10 percent, whichever is lower. In other words, your annual increase can never exceed 10 percent under any circumstances, and in years when inflation is low it will be capped well below that.
There are a few other moving parts that matter just as much as the headline percentage:
A 12-month rent freeze at the start of every tenancy. You cannot raise rent at all during the first 12 months after a tenancy begins, regardless of what the cap allows.
A 5 percent hard cap on manufactured and mobile home lot rents, with no expiration date.
A 15-year sunset on the main residential cap, meaning the percentage-based limit is currently scheduled to last through roughly 2040.
If you have spent any time managing rentals in Seattle, parts of this will feel familiar. The state has now extended a version of what Seattle tenants already had to landlords in every corner of King County, from Sammamish to Shoreline.
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The 2026 number: 9.683 percent
Here is where landlords get tripped up. The cap is not a flat 7 percent. It floats with inflation, and the Department of Commerce publishes a new maximum each year.
That number is calculated using the June 12-month percent change in the Consumer Price Index for all urban consumers, all items, for the Seattle area, as published by the U.S. Bureau of Labor Statistics. Commerce releases the figure shortly after the June data comes out, typically in early July. So the 2027 cap will not be known until summer of next year, which is something to keep in mind if you are planning a multi-year rent schedule.
A practical example: if your Kirkland condo currently rents for $2,400 a month and the tenant has been in place more than a year, the most you can raise it in a 12-month period during 2026 is $2,400 times 9.683 percent, or about $232 a month, bringing the new rent to roughly $2,632. Push past that without a valid exemption and you have an unlawful increase.
Who is exempt
Not every rental is subject to the cap. The exemptions, defined in RCW 59.18.710 and summarized in the Department of Commerce guidance and by Multifamily NW, are the part most small landlords need to read carefully because several of them apply to exactly the kind of properties our clients own:
New construction is exempt for 12 years from the certificate of occupancy date.
Single-family owner-occupied residences where the owner rents out no more than two units or bedrooms, including an attached or detached accessory dwelling unit. If you live in your house and rent a basement apartment plus an ADU, you may fall here.
Duplexes, triplexes, and fourplexes where the owner lives in one unit as their principal residence.
Owner-occupied homes where the tenant shares a kitchen or bathroom with the owner.
Qualified low-income housing with an enforceable regulatory agreement tied to federal tax credits.
The exemptions are narrow and fact-specific. "I only own a couple of units" is not an exemption. "I live in one unit of my triplex" is. If you are not certain which bucket your property falls into, treat it as covered until a professional tells you otherwise, because the downside of guessing wrong is steep.
The notice rules changed too, and Seattle's are stricter
The rent cap gets the headlines, but the notice requirements are where we see the most accidental violations.
Statewide, HB 1217 requires residential landlords to give at least 90 days' prior written notice of any rent increase, in any amount. That is up from the 60 days that applied under older law. The notice has to be served properly: Commerce specifies that a housing provider must attempt personal service first, and if that is not possible, must both post the notice on the property and send it by first-class mail.
If your rental is inside Seattle city limits, the bar is higher. Seattle requires a minimum of 180 days' advance written notice for any rent increase, regardless of amount, a rule in place since late 2021 and confirmed on the City of Seattle's RentingInSeattle portal. To raise rent on June 1, a Seattle tenant would need the notice no later than early December of the prior year. Seattle also has an Economic Displacement Relocation Assistance program that can be triggered when an increase reaches 10 percent or more in a 12-month period, as outlined in Seattle's rent increase guidance summarized by Steadily.
The takeaway: a Bellevue or Issaquah landlord works off the 90-day state clock, while a Seattle landlord works off a 180-day clock. Mixing those up is one of the easiest and most expensive mistakes to make, because an improperly noticed increase is simply not enforceable.
What happens if you get it wrong
The enforcement teeth in HB 1217 are not theoretical. According to legal analysis from Stoel Rives LLP and North City Law, a tenant who is charged an unlawful increase can recover:
Actual damages, meaning any excess rent or fees they paid.
Statutory damages of up to three months' rent for the unlawful increase.
Reasonable attorneys' fees and costs.
On top of that, the Washington Attorney General can enforce the law under the Consumer Protection Act and seek civil penalties of up to $7,500 per violation. Tenants generally must first give the landlord a written demand to correct the increase, and a tenant facing an over-cap increase can terminate the lease with as little as 20 days' notice without penalty. If a landlord tries to evict over an unlawful increase, the tenant can raise HB 1217 as a defense, which can stall the whole process for months.
For a small landlord, a single mistake here can wipe out years of margin. Three months' rent on a $2,600 unit is nearly $8,000 before you add legal fees. That math is exactly why we treat rent increases as a compliance task, not a casual email to the tenant.
How small King County landlords should handle 2026
None of this means you should freeze your rents or sell. It means you need a process. Here is the approach we recommend to the owners we work with.
Confirm whether the cap even applies to your property. Run your situation against the exemption list above. If you are unsure, get it confirmed in writing before you send any notice.
Calculate against the current ceiling, not last year's. Use the 9.683 percent figure for any increase taking effect in 2026, and recheck the published rate before planning a 2027 increase. The rate changes every July.
Get the notice period right for your city. Ninety days almost everywhere in King County, 180 days inside Seattle. Build the lead time into your calendar so a planned increase is never rushed.
Decide whether maxing out the cap is even the right move. Just because you can raise rent 9.683 percent does not mean you should. A good long-term tenant who pays on time and reports problems early is worth far more than the marginal increase. We dig into this trade-off in our guide on how to raise rent without losing good tenants, and it pairs well with our advice on setting competitive rent prices for your King County rental.
Reduce turnover so you depend on increases less. When a tenant leaves, the costs stack up fast: a professional turnover clean, repairs, vacancy, and re-listing. Keeping good tenants is often more profitable than chasing the maximum increase, which is why we focus so much on reducing tenant turnover at King County rentals.
Protecting your margins when you cannot raise rent freely
The honest reality of a capped-rent environment is that you can no longer rely on big rent jumps to absorb rising costs. When inflation runs hot, your expenses can climb faster than 9.683 percent while your revenue cannot. That puts a premium on controlling the costs you actually control.
This is also where rising property taxes compound the squeeze. King County property taxes rose 10 percent in 2026 at a time when your rent increases are capped below that. The two trends together mean the margin protection that used to come from rent now has to come from operations: smarter vendor selection, preventive service on systems like HVAC and plumbing, and renovations that genuinely pay for themselves rather than cosmetic ones that do not.
Washington's rent cap is now a permanent fixture of the King County landlord's world, at least for the next decade and a half. The number to remember for this year is 9.683 percent. The notice period is 90 days in most of King County and 180 days in Seattle. The exemptions are real but narrow. And the penalties for ignoring any of it can erase years of returns.
The landlords who thrive under these rules are not the ones who fight them. They are the ones who treat compliance as routine, keep good tenants longer, and protect their margins by running their properties well rather than leaning on aggressive rent increases that may not even be legal.
That is exactly the kind of operational discipline we handle for small landlords every day, from preventive maintenance to coordinating the right trades at the right time. If you would rather spend your energy on strategy than on chasing contractors and tracking notice deadlines, our Valta Homes membership is built for owners of one to three properties who want a single team managing the upkeep. You can also reach our team directly or call us at (425) 800-8268 to talk through your specific property.
The rules are not going anywhere. The landlords who build a system around them will be the ones still smiling at the end of the decade.
