Washington contractor license
TREFETHEN & CO LLC
- CC-BT Inst Equip/Stat Furn/Lab T/Lo
TREFETHEN & CO LLC is a CC-BT Inst Equip/Stat Furn/Lab T/Lo contractor in Seattle, licensed in Washington for under a year. As of Oct 28, 2026, the license is active with an expiration date of Jul 24, 2028 on record and a license bond is on file.
TREFETHEN & CO LLCCC-BT Inst Equip/Stat Furn/Lab T/Lo · checked Oct 28, 2026
ActiveLicense number#TREFECL742MP
Licensed sinceJul 24, 2026
Years licensedUnder 1 year
Expiration on recordJul 24, 2028
City and countySeattle
License bondOn file
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Source: Washington State Department of Labor & Industries (L&I) contractor records. Last updated Oct 28, 2026. Page refreshed Nov 4, 2026.