COSTIGAN CONSTRUCTION COMPANY
Accessory Live/Work builder · Seattle, King County
WA L&I registration: unknown (as of May 2026)1 ADUs permitted
in Seattle / King County · verified from public permit records
Verified permits
1
Permitting since
2009
Service area
King County
ADU types
Accessory Live/Work
Verified permit record
1 ADU building permits on public record in King County, 2009. Drawn from City of Seattle permit data and matched to COSTIGAN CONSTRUCTION COMPANY's Washington contractor registration. Project addresses are not published.
Project photos
Project photos appear once COSTIGAN CONSTRUCTION COMPANY claims this listing.
About
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Permit record: City of Seattle SDCI permit data.
License status: WA L&I (data.wa.gov).