Owner-Occupancy Requirement

Frequently asked

• What does Owner-Occupancy Requirement mean in the context of an ADU?

  Owner-Occupancy Requirement is part of the regulatory and technical vocabulary you encounter when permitting and building an accessory dwelling unit in Washington. Knowing the term matters because reviewers, inspectors, and your lender will use it without explanation. We define Owner-Occupancy Requirement in plain English and connect it to the specific code citation, fee, or construction detail that affects your project. Use the related-terms section to navigate adjacent concepts you'll need on the same plan set.

  Go deeper: Read: When Seattle dropped ADU owner-occupancy — and why it changed the math→

• Where does Owner-Occupancy Requirement apply in the WA ADU process?

  Owner-Occupancy Requirement typically shows up in either the design phase (when the architect or designer is laying out plans against zoning), the permit phase (when reviewers check the submittal against code), or the construction phase (when inspectors verify built conditions match the approved set). The same term can appear in your loan documents if it affects valuation or risk. Each glossary entry maps the term to the exact phase where it matters most.

  Go deeper: Read: When Seattle dropped ADU owner-occupancy — and why it changed the math→

• Why should I care about Owner-Occupancy Requirement for my project?

  Misunderstanding Owner-Occupancy Requirement is one of the most common reasons ADU projects hit avoidable cost overruns or permit delays. A clear shared vocabulary between you, your designer, and your builder shortens decision time and reduces change orders. Bookmark this glossary and refer back as you progress from feasibility through final inspection.

  Go deeper: Glossary: Owner-Occupancy Requirement→

• How does Owner-Occupancy Requirement affect my ADU budget?

  Most glossary terms map to either a cost line, a review timeline, or a permit fee. Where Owner-Occupancy Requirement drives cost, the impact is itemized in our standard fee schedule and itemized at feasibility — so by contract time, Owner-Occupancy Requirement is a known number, not a discovered surprise. Click through to the related cost or permit page for the current Owner-Occupancy Requirement-specific dollar range and timeline.

  Go deeper: Read: When Seattle dropped ADU owner-occupancy — and why it changed the math→

• Is Owner-Occupancy Requirement regulated under RCW 36.70A.681?

  WA statewide ADU preemption (RCW 36.70A.681 / HB 1337) covers many ADU-adjacent topics: size caps, setbacks, owner-occupancy, parking, height, lot-size minimums. Whether Owner-Occupancy Requirement falls under preemption depends on its specific scope — design review, side-sewer permitting, drainage review, and tree-protection rules are generally NOT preempted, while size/setback/parking generally ARE. Each glossary entry flags the preemption status.

  Go deeper: Glossary: Owner-Occupancy Requirement→