Washington L&I Data · Updated Oct 30, 2026Free and Independent · Not a Government Site

General contractor · Mountlake Terrace, WA

Diamond C Construction LLC

Active  Washington registration DIAMOCC814BP · per L&I records

LicensedBondedInsured

Is Diamond C Construction LLC Licensed?

Washington L&I records list Diamond C Construction LLC with registration number DIAMOCC814BP and status ACTIVE, valid until Jan 17, 2027. The business address on file is in Mountlake Terrace, WA 98043.

License Details

License #
DIAMOCC814BP
Status
ACTIVE
License type
Construction Contractor
Specialty
General
First effective
Jan 17, 2019
Expires
Jan 17, 2027
Business type
Limited Liability Company
UBI (state business ID)
604368084
City
Mountlake Terrace, WA 98043

Bond and Insurance on File

Surety bond
$30,000 · Western Surety Co
Effective Jan 17, 2025 · Until Canceled
Liability insurance
$1,000,000 · Contractors Bonding & Insuranc
Expires Jan 16, 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 78 days left before it expires on Jan 17, 2027. If your project runs past that date, ask whether the business has renewed.

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

How This Record Compares in Mountlake Terrace

Diamond C Construction LLC has held registration DIAMOCC814BP for 7.8 years. The median for the 109 active general contractors with a Mountlake Terrace address is 3.7 years, and 23 of them have held their registration for 10 years or more, so this registration is at or above the local median. 24 of them registered in the last 12 months.

100% of these Mountlake Terrace 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

  • Jan 17, 2019: Current registration DIAMOCC814BP took effect.
  • Jan 17, 2025: $30,000 surety bond with Western Surety Co took effect.
  • Oct 30, 2026: Our copy of the L&I record was taken.
  • Jan 16, 2027: Contractors Bonding & Insuranc liability policy on file expires.
  • Jan 17, 2027: Registration expires unless renewed.

Checks for General Contractors

How to Verify This Contractor

  1. Use the Confirm on L&I Verify button and search registration DIAMOCC814BP or UBI 604368084. The status there is the official one.
  2. Check that the name on your bid or contract matches Diamond C Construction LLC exactly (a limited liability company).
  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 Contractors Bonding & Insuranc policy on file.

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

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

Other General Contractors in Mountlake Terrace

Active general contractor registrations with a Mountlake Terrace address in the same L&I file. Listing here is not an endorsement.

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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