Do You Have to Live On-Site to Have an ADU in Washington?

Short answer: for most lots in Washington, no — you no longer have to live on-site to have an ADU. The old owner-occupancy requirement was rolled back, and it's one of the biggest reasons ADUs now make sense as income properties. Here's what changed.

What owner-occupancy used to require

For years, many cities required the property owner to live on the lot — in either the main house or the ADU — in order to have an accessory unit. That rule made it hard to use an ADU purely as a rental, and it blocked investors and anyone who wanted to move away but keep the property.

What changed

Washington's ADU reforms removed the owner-occupancy requirement in many cases, part of a broader push to make backyard homes easier to build and rent. You can read the full picture in Washington's ADU laws.

Why it matters

• You can rent out the ADU without living on the property
• On many lots you can rent out both the main house and the ADU
• An ADU becomes a viable investment or income property
• You keep flexibility if you move but want to hold the property

In other words, an ADU is no longer just a place for family — it's a real income opportunity. See how the returns work in is an ADU a good investment? and renting out your ADU.

Does it apply to your city?

The state sets the direction, but each city and county implements the rules locally, so the exact standards depend on where your property is. A feasibility study confirms what applies to your specific lot — which is how we start every project.

Thinking about an income property?

If an ADU-as-rental is the goal, we'll help you build it right. Estimate the cost with the ADU cost calculator, or get in touch and we'll tell you what your lot allows.