General contractor · Snohomish, WA

Corstone Contractors LLC

Active Washington registration CORSTCL984KZ · per L&I records

LicensedBondedInsured

Is Corstone Contractors LLC Licensed?

Washington L&I records list Corstone Contractors LLC with registration number CORSTCL984KZ and status ACTIVE, valid until May 9, 2028. The business address on file is in Snohomish, WA 98290.

License Details

License #: CORSTCL984KZ
Status: ACTIVE
License type: Construction Contractor
Specialty: General
First effective: May 9, 2002
Expires: May 9, 2028
Business type: Limited Liability Company
UBI (state business ID): 602202840
City: Snohomish, WA 98290

Bond and Insurance on File

Surety bond: $30,000 · Merchants Bonding Co (Mutual)
Effective May 9, 2026 · Until Canceled
Liability insurance: $1,000,000 · Hartford Fire Ins Co
Expires May 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 556 days left before it expires on May 9, 2028. Check that date against your project timeline.

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

How This Record Compares in Snohomish

Corstone Contractors LLC has held registration CORSTCL984KZ for 24.5 years. The median for the 690 active general contractors with a Snohomish address is 7.2 years, and 257 of them have held their registration for 10 years or more, so this registration is among the longer-held ones. 71 of them registered in the last 12 months.

99% of these Snohomish 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

May 9, 2002: Current registration CORSTCL984KZ took effect.
May 9, 2026: $30,000 surety bond with Merchants Bonding Co (Mutual) took effect.
Oct 30, 2026: Our copy of the L&I record was taken.
May 1, 2027: Hartford Fire Ins Co liability policy on file expires.
May 9, 2028: 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 CORSTCL984KZ or UBI 602202840. The status there is the official one.
Check that the name on your bid or contract matches Corstone Contractors LLC exactly (a limited liability company).
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 Hartford Fire Ins Co 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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