O'Neill Plumbing Co

Is O'Neill Plumbing Co Licensed?

Washington L&I records list O'Neill Plumbing Co with registration number ONEILP*253DP and status ACTIVE, valid until Mar 20, 2027. The business address on file is in Seattle, WA 98136.

License Details

License #

ONEILP*253DP

Status

ACTIVE

License type

Construction Contractor

Specialty

General

First effective

Mar 17, 1975

Expires

Mar 20, 2027

Business type

Corporation

UBI (state business ID)

600144508

City

Seattle, WA 98136

Bond and Insurance on File

Surety bond

$30,000 · MERCHANTS NATIONAL BONDING INC
Effective Sep 24, 2026 · Until Canceled

Liability insurance

$1,000,000 · Middlesex Insurance Company
Expires Aug 1, 2027

What Active Status Means

The registration is current: L&I has a bond and liability insurance on file and the term has not ended. ACTIVE is necessary but not sufficient, so also check the expiry date, the bond and the insurance below.

Can this business work under this registration? Can work while it stays active.

The registration has 139 days left before it expires on Mar 20, 2027. Check that date against your project timeline.

All status codes are explained in Washington Contractor License Statuses Explained.

How This Record Compares in Seattle

O'Neill Plumbing Co has held registration ONEILP*253DP for 51.6 years. The median for the 2,643 active general contractors with a Seattle address is 6.2 years, and 928 of them have held their registration for 10 years or more, so this registration is among the longer-held ones. 383 of them registered in the last 12 months.

99% of these Seattle records have a surety bond on file and 100% have liability insurance on file. The median insurance amount on file is $1,000,000; this business lists $1,000,000, which is equal to that median. Insurance amounts are what the insurer reported to L&I; they are not a rating of the business.

Record Timeline

• Mar 17, 1975: Current registration ONEILP*253DP took effect.
• Sep 24, 2026: $30,000 surety bond with MERCHANTS NATIONAL BONDING INC took effect.
• Oct 30, 2026: Our copy of the L&I record was taken.
• Mar 20, 2027: Registration expires unless renewed.
• Aug 1, 2027: Middlesex Insurance Company liability policy on file expires.

Other L&I Registrations Under UBI 600144508

The L&I file lists 1 other contractor registration under the same state business ID (UBI). Older numbers usually reflect renewals under a new number, name changes or a change of business structure.

• ONEILPC793ND · O'Neill Plumbing Co · ACTIVE · effective Jul 26, 2021, expires Jul 26, 2027

Checks for General Contractors

• General contractors must file a $30,000 surety bond (RCW 18.27.040, effective July 1, 2024). This record lists a $30,000 bond. See General vs Specialty Contractor Registration in Washington.
• Use a general contractor when the project involves more than one trade. Subcontractors on your job must be registered too.
• Compare bids on scope, schedule and payment terms, not just the total.
• More detail: How to Choose a General Contractor in Washington.

How to Verify This Contractor

1. Use the Confirm on L&I Verify button and search registration ONEILP*253DP or UBI 600144508. The status there is the official one.
2. Check that the name on your bid or contract matches O'Neill Plumbing Co exactly (a corporation).
3. On L&I Verify, look for bond claims, lawsuits and any newer registration.
4. Ask for a certificate of insurance sent directly by the insurer, and compare it with the Middlesex Insurance Company policy on file.

A full walkthrough is in How to Check a Contractor License in Washington.

Record data as of Oct 30, 2026, from the Washington L&I contractor file.

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