Get free adu construction quotes in Seattle
Free adu construction quotes in Seattle, Washington. Typical range $192,000 – $384,000.
Low
$192,000
Average
$288,000
High
$384,000
Seattle crews quote about $320 – $640 per square foot.
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What drives adu construction prices in Seattle
Local labor, permitting and climate move Seattle prices away from the national average.
Labor market
Seattle trade labor is among the most expensive in the country and books months ahead.
Permits
SDCI permits and inspections are required for most exterior and structural work.
Climate
Persistent rain demands drainage detailing, flashing and rot-resistant materials.
How to compare Seattle quotes
- Collect three written quotes. Anything under $144,000 usually has scope missing.
- Compare line items — materials, labor, permits, disposal — not just the total.
- Confirm license, insurance and workmanship warranty length before you sign.
- Ask what triggers a change order and how it gets priced.
Seattle questions
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