ADU Builder Index

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Terracon Consultants Inc..

1completed ADU permits
1total ADU permits
2006–2006active years on record
$149,886median est. project cost

Washington state license

No exact business-name match in the WA L&I registry — this builder may hold a license under a different legal name. Check the registry directly.

Permit record

Every ADU-related permit in covered city records naming this contractor. Links go to each city's official permit portal.

PermitCityIssuedStatusEst. costAddressDescription
6088525-CN2006-04-26Completed$149,8862323 N 59TH STConstruct concrete stairwell deck addition and 2nd floor addition. Interior kitchen & bath remodel to existing single family residence and existing ADU all per plans.

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