ContractorHistory

Washington contractor

KNOCKOUT PLUMBING & MECH LLC

Registered in Washington for 4 years

License number
KNOCKPM782DB
UBI
604427827
Trade
Plumbing(all plumbing contractors in Washington)
L&I license type and specialty
PLUMBING CONTRACTOR · RESIDENTIAL
City
SEATTLE, WA(all contractors in Seattle)
Phone
(206) 858-2211

Current verification

  • Found: Active Washington contractor registration
  • Found: Current bond record found
  • Found: Current liability insurance record found
  • Found: No Attorney General complaint records found
  • Review: 2 other license records under the same UBI

From the state records below; each section shows its source and when it was last synced.

Registration

Status
ACTIVE
Effective date
March 25, 2022
Expiration date
March 25, 2028

Source: L&I Contractor License Data - General, Washington State Department of Labor & Industries. Last synced October 7, 2026.

Related licenses

2 other license numbers are registered under the same UBI, 604427827. 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.

Source: L&I Contractor License Data - General, Washington State Department of Labor & Industries. Last synced October 7, 2026.

Bond

Current bond

  • Bond company
    Western Surety Co
    Bond number
    66191037
    Amount
    $6,000
    Effective date
    March 25, 2022
    Expiration date
    Until canceled

Source: L&I Contractor License Data - Bond, Washington State Department of Labor & Industries. Last synced October 9, 2026.

Liability insurance

Current policy

  • Carrier
    Federated Mutual Ins Co
    Policy number
    1866466
    Coverage amount
    $1,000,000
    Effective date
    July 14, 2023
    Expiration date
    July 14, 2027

L&I publishes only the policy currently on file. Earlier policies are kept from our own nightly syncs, which began October 6, 2026.

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.

  • MILLER, ZACHARY STEPHENSince February 23, 2022

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: KNOCKOUT PLUMBING MECH in SEATTLE. Complaints filed under another name or city are not included.

2 other registered contractors share this business name and city: KNOCKOUT PLUMBING & MECH LLC (KNOCKPM743K9, ACTIVE), KNOCKOUT PLUMBING & MECH LLC (KNOCKPM817J2, EXPIRED). 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

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 KNOCKPM782DB).