Renting Out Your ADU: A Seattle Homeowner’s Guide
By Eric Dexter, Owner & Builder ·
A backyard ADU is one of the few ways to turn land you already own into monthly income — which is exactly why “ADU rentals near me” is one of the fastest-rising searches in Washington. If you're thinking about renting one out (or building one to rent), here's how it works.
Long-term vs. short-term rental
The first decision is how you'll rent it. A long-term rental (a standard lease) gives you steady, predictable income with the least day-to-day work and the fewest regulatory hurdles. A short-term rental (think nightly stays) can earn more per night but comes with more management and stricter local rules — Seattle and many cities regulate short-term rentals, so check your city before counting on it.
What can you charge?
Rent depends on the unit's size, location and finish level, but in a high-cost market like Seattle a well-built DADU can command real monthly rent — often enough to cover a big share of the loan you used to build it. We break down the returns in is an ADU a good investment?
You don't have to live on-site
A big reason renting an ADU got easier: Washington rolled back the old owner-occupancy requirement in many cases, so on most lots you can rent out the ADU — or even both homes — without living there yourself. That's a major shift for anyone thinking of an ADU as an income property.
Building an ADU to rent
If your goal is rental income, design for it from the start: a private entrance, good separation from the main house, durable finishes that hold up to tenants, and a smart, efficient layout. Browse ready-to-build floor plans for rentable layouts, and price your build with the ADU cost calculator.
One thing to settle before you sign a lease: if you might ever want to sell the cottage separately, a tenant in place within twelve months of a first purchase agreement can pull the project into Washington's conversion building rules. That, and the condominium structure a separate sale requires, are covered in can you sell a DADU separately in Washington.
A note on being a landlord
Renting out an ADU makes you a landlord, which comes with responsibilities — screening tenants, a solid lease, and following Washington landlord-tenant rules. It's very manageable, especially with a single unit, but worth understanding before you start.
Make your ADU pay
The math starts with an honest build cost and an honest carrying cost — renting the unit year-round also interacts with Washington's ADU property tax programs. A tenant also changes what you need to insure — see what insurance an ADU actually needs. Estimate yours with the calculator, see the financing options, or talk to us about building a backyard home designed to rent.
