Washington contractor
TREFETHEN AND CO INC
First registered in Washington on April 9, 2009
- License number
- TREFECI914JZ
- UBI
- 602775224
- Trade
- Other(all other contractors in Washington)
- L&I license type and specialty
- CONSTRUCTION CONTRACTOR · INST EQUIP/STAT FURN/LAB T/LO
- City
- Seattle, WA(all contractors in Seattle)
- Phone
- (206) 447-1770
Current verification
- Found: No Attorney General complaint records found
- Review: Registration is not currently active
- Review: A registration suspension is on record
- Review: 1 other license record under the same UBI
From the state records below; each section shows its source and when it was last synced.
Registration
- Status
- SUSPENDED
- Effective date
- April 9, 2009
- Expiration date
- May 14, 2027
- Suspension date
- July 9, 2026
Source: L&I Contractor License Data - General, Washington State Department of Labor & Industries. Last synced October 7, 2026.
Related licenses
One other license number is registered under the same UBI, 602775224. A UBI identifies one business with the state; a business may hold more than one license, renew under a new number, or register a new license after an earlier one closed.
- TREFETHEN & CO LLCACTIVE
License TREFECL742MP · CONSTRUCTION CONTRACTOR · July 24, 2026 to July 24, 2028
Source: L&I Contractor License Data - General, Washington State Department of Labor & Industries. Last synced October 7, 2026.
Bond
L&I does not publish bond records for contractors with SUSPENDED status.
Source: L&I Contractor License Data - Bond, Washington State Department of Labor & Industries. Last synced October 9, 2026.
Liability insurance
L&I does not publish liability insurance records for contractors with SUSPENDED status.
Source: L&I Contractor License Data - Insurance, Washington State Department of Labor & Industries. Last synced October 9, 2026.
People
Principals L&I lists for this license.
- TREFETHEN, SEAN BRADLEYSince April 9, 2009
Source: L&I Contractor License - Principal Data, Washington State Department of Labor & Industries. Last synced October 9, 2026.
Attorney General complaints
No Attorney General complaint records found.
Matched on business name and city: TREFETHEN in Seattle. Complaints filed under another name or city are not included.
One other registered contractor shares this business name and city: TREFETHEN & CO LLC (TREFECL742MP, ACTIVE). Complaints are matched by business name and city, so any complaint records shown here also appear on those pages. The records do not say which of these contractors a complaint was about.
A complaint record does not establish that the business violated the law.
Source: Attorney General Consumer Complaints, Washington State Attorney General's Office. Last synced October 9, 2026.
Record history
Changes to this contractor's state records since we began tracking them. The state's current-status tools do not show these.
No changes recorded since our records began on October 6, 2026.
Sources
- L&I Contractor License Data - General, Washington State Department of Labor & Industries
- L&I Contractor License Data - Bond, Washington State Department of Labor & Industries
- L&I Contractor License Data - Insurance, Washington State Department of Labor & Industries
- L&I Contractor License - Principal Data, Washington State Department of Labor & Industries
- Attorney General Consumer Complaints, Washington State Attorney General's Office
Record last synced October 7, 2026.
Check this record against the state directly on L&I's Verify a Contractor page (search by license number TREFECI914JZ).