Seattle Rent Increase Laws (2026)

The statewide cap

Typically, it is in an owner's best interest to move rent toward market as soon as the lease allows. However, in Washington the amount is capped and in Seattle the timing is too, and an increase served wrong can be a slow and expensive thing to unwind.

Ideally a rent increase is a short letter, but there are a variety of requirements that apply before the new rent can actually be collected:

• No increase in the first year. HB 1217, in force since May 2025, bars any increase during the first 12 months of a tenancy.
• The annual ceiling. After that, an increase may not exceed the lesser of 10% or 7% plus CPI. The Department of Commerce publishes the figure each year and the 2026 maximum is 9.683%.
• Manufactured-home lots. Capped separately at 5%.
• New construction. Buildings certified for occupancy within the last 12 years are exempt from the cap.

Owners should re-check the Commerce figure every year rather than carrying last year's number forward, and the exemption is worth confirming against the certificate of occupancy rather than assuming it from the building's apparent age.

Seattle's notice period is double the state's

Washington requires 90 days' written notice of a rent increase. Seattle requires 180 days, for any increase, of any size. The city rule is the one to diary against.

The relationship between the state requirement and Seattle's own rules can be complex to understand. For example:

• The state sets the ceiling on the amount, whereas the city sets the runway on the timing — you can satisfy one and still be unenforceable under the other.
• The increase must take effect at the beginning of a rental period; it cannot land mid-month.
• The notice must use the required state form and carry the city's language telling the tenant how to reach Renting in Seattle. A notice missing that language is unenforceable, and the 180 days begins again from the corrected one.

At 10%, you may end up funding the move

Where the increase is 10% or more within 12 months, Seattle's Economic Displacement Relocation Assistance applies, and an EDRA notice must be attached to the increase notice itself. In effect the city turns a large increase into a potential cash-for-keys transaction that you did not choose.

A tenant household earning 80% or less of area median income that moves as a result may claim three times their current monthly housing cost. The City advances that money to the tenant and the landlord reimburses the City, so this is a real liability rather than a paperwork step — and it arrives after the tenant has already gone.

No owner wants to fund a tenant's move. The sum of three months' housing cost, a re-served notice and another six months of runway can easily balance out the gain from the increase itself for the next several months. Which is why the gap between a 9.9% increase and a 10.1% increase is not 0.2% of rent — it is 0.2% of rent plus a possible three months' housing cost.

When the increase is not worth what it triggers

In some situations it may be more efficient to reach an agreement with the current tenant than to push an increase through and absorb what attaches to it. The sum of relocation assistance, a re-served notice and six months of runway can easily balance out the gain from the increase for the next several months.

There are a variety of scenarios worth weighing before serving:

• Stay under the threshold. An increase of 9.9% carries no EDRA exposure; 10.1% does. Where the gap between them is small, the cheaper number is often the higher-returning one.
• Time it to a renewal. Serving with 180 days' notice against a renewal date keeps the increase and the lease term aligned, rather than landing mid-tenancy.
• Negotiate the move. Where you want the unit back rather than more rent, an agreed cash-for-keys arrangement often incentivises a tenant to vacate quickly and with less hassle than a contested process, and it can help a tenant who is struggling find a new residence faster.
• Do the work between tenancies. Turnover is the one moment the cap is not the constraint, since the first 12 months of a new tenancy set the rent rather than raise it.

Seattle rents have been roughly flat lately — around $2,083 a month and slightly down year on year — so the market itself is often setting a lower ceiling than the law does.

What this means in practice

An increase decided in January and served in February takes effect in August at the earliest. Anything above 10% should be modelled with the relocation exposure attached, and anything at all should be checked against the current year's Commerce figure before the notice is drafted. Staying just under the threshold, or timing the increase to a renewal, is often more cost-effective in the long run and certainly saves time and headache compared with getting it wrong.