General contractor · Seattle, WA

Costigan Construction Company

Active Washington registration COSTICC099DK · per L&I records

LicensedBondedInsured

Is Costigan Construction Company Licensed?

Washington L&I records list Costigan Construction Company with registration number COSTICC099DK and status ACTIVE, valid until Apr 28, 2027. The business address on file is in Seattle, WA 98119.

License Details

License #: COSTICC099DK
Status: ACTIVE
License type: Construction Contractor
Specialty: General
First effective: Mar 12, 1991
Expires: Apr 28, 2027
Business type: Corporation
UBI (state business ID): 601289809
City: Seattle, WA 98119

Bond and Insurance on File

Surety bond: $30,000 · American Contractors Indem CO
Effective Apr 24, 2025 · Until Canceled
Liability insurance: $1,000,000 · Contractors Bonding & Insuranc
Expires Apr 24, 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 179 days left before it expires on Apr 28, 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

Costigan Construction Company has held registration COSTICC099DK for 35.6 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 12, 1991: Current registration COSTICC099DK took effect.
Apr 24, 2025: $30,000 surety bond with American Contractors Indem CO took effect.
Oct 30, 2026: Our copy of the L&I record was taken.
Apr 24, 2027: Contractors Bonding & Insuranc liability policy on file expires.
Apr 28, 2027: Registration expires unless renewed.

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

Use the Confirm on L&I Verify button and search registration COSTICC099DK or UBI 601289809. The status there is the official one.
Check that the name on your bid or contract matches Costigan Construction Company exactly (a corporation).
On L&I Verify, look for bond claims, lawsuits and any newer registration.
Ask for a certificate of insurance sent directly by the insurer, and compare it with the Contractors Bonding & Insuranc 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.

Accuracy notice. Data from Washington L&I open data (public domain, PDDL), not affiliated with any government. Records change; confirm on the official L&I Verify tool before hiring. Search other businesses with the Washington contractor license lookup.

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