Can You Airbnb an ADU in Seattle?

Short answer: in Seattle, yes — an ADU or DADU can legally be a short-term rental. But it sits inside a cap, needs two separate licenses, and has to clear a residency test. And the City saying yes is only one of three permissions you may need.

Rules here change, so treat this as the shape of the system and confirm the current detail with the City before you list anything.

The two-unit cap

Seattle limits an operator to two short-term rental units citywide. For most homeowners the natural arrangement is their own home plus one more unit — and a backyard DADU is a very common second unit. A detached ADU is explicitly allowed to be one of them.

Renting spare bedrooms inside your own house, where guests share your kitchen and bathroom, generally does not create additional units. It is the separate, self-contained dwelling that counts.

Two licenses, not one

• A short-term rental operator's license, per unit, renewed annually for a modest fee.
• A separate regulatory business license.

Platforms also collect and remit certain taxes on bookings, which is not the same thing as you being licensed. Both licenses are on you.

The primary-residence test

Seattle's framework is built around the operator actually living on the property — broadly, occupying the residence for at least half the year. That is what separates a homeowner renting their backyard cottage from an investor running a portfolio of listings, and it is the provision that most often decides whether a given plan works.

Worth separating from a different rule people confuse it with: Washington removed owner-occupancy requirements for simply having an ADU — see do you have to live on-site to have an ADU. You do not have to live there to build or long-term rent one. Short-term renting is its own regime with its own residency expectations.

Downtown and First Hill carry additional overlay provisions, so a unit there needs its own check.

Two things that override the City

This is where plans quietly die, and both have their own article on this site because both catch people out:

• Your CC&Rs. Many homeowners associations restrict or prohibit short-term renting outright, and a City license does not override a recorded covenant. See whether an HOA can stop an ADU.
• Your insurance. Plenty of standard homeowners policies exclude short-term rental activity entirely. A claim is a bad time to discover that — see what insurance an ADU needs.

Outside Seattle it is a different question entirely

None of the above travels. Cities across King and Snohomish County set their own short-term rental rules, and some are considerably more restrictive than Seattle. If your lot is in Bothell, Monroe, Everett or unincorporated county, start from ADU rules outside Seattle and check your jurisdiction directly.

Should you, though?

Licensing aside, short-term renting is a different business from long-term renting: higher gross, far more turnover, cleaning, guest communication, furnishing costs and seasonal swings. A long-term tenant is quieter money. We compare the income side in how much rent an ADU earns and renting out your ADU.

Build-wise it changes very little — a DADU designed for a long-term tenant is the same building. What changes is furnishing, storage, and whether you want a separate entrance sequence and some acoustic separation from the main house.

Build it first, decide the rental model second

The unit has to be permitted, inspected and finished either way. If short-term renting is the plan, raise it early so the layout and entry suit it — send us your address and we'll tell you what your lot allows, or start with can I build an ADU on my lot.