Mill Creek ADU Cost: What Homeowners Should Budget For
Real Mill Creek, WA pricing for detached and attached ADUs across six lot-size bands. Numbers reflect current bids and recent projects, not internet averages.
Last verified 2026-05-15 · Page in progress — not yet indexed
We're verifying Mill Creek's cost data this quarter. Contact us for a current estimate on your specific lot.
Numbers above are planning estimates from current bids and recent Golden State ADU projects on Puget Sound lots — they are not city-published fees. Verify current Mill Creek permit and utility fees against the official sources linked below before committing a budget.
Mill Creek ADU pricing questions
What does a typical detached ADU cost in Mill Creek?
Mill Creek all-in detached ADU pricing varies by lot size and site complexity. Send your address for a same-week range.
What's included in the Mill Creek construction line?
Construction in Mill Creek is priced separately from design, permits, and site work so each line is visible.