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

General contractor · Sedro Woolley, WA

Mammoth Construction LLC

Active  Washington registration MAMMOCL762D8 · per L&I records

LicensedBondedInsured

Is Mammoth Construction LLC Licensed?

Washington L&I records list Mammoth Construction LLC with registration number MAMMOCL762D8 and status ACTIVE, valid until Apr 13, 2028. The business address on file is in Sedro Woolley, WA 98284.

License Details

License #
MAMMOCL762D8
Status
ACTIVE
License type
Construction Contractor
Specialty
General
First effective
Apr 12, 2024
Expires
Apr 13, 2028
Business type
Limited Liability Company
UBI (state business ID)
605485134
City
Sedro Woolley, WA 98284

Bond and Insurance on File

Surety bond
$30,000 · Nationwide Mutual Ins Co
Effective Jul 1, 2024 · Until Canceled
Liability insurance
$1,000,000 · Scottsdale Ins Co
Expires Apr 12, 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 530 days left before it expires on Apr 13, 2028. Check that date against your project timeline.

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

How This Record Compares in Sedro Woolley

Mammoth Construction LLC has held registration MAMMOCL762D8 for 2.5 years. The median for the 220 active general contractors with a Sedro Woolley address is 6.7 years, and 68 of them have held their registration for 10 years or more, so this registration is newer than most in Sedro Woolley. 30 of them registered in the last 12 months.

100% of these Sedro Woolley 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

  • Apr 12, 2024: Current registration MAMMOCL762D8 took effect.
  • Jul 1, 2024: $30,000 surety bond with Nationwide Mutual Ins Co took effect.
  • Oct 30, 2026: Our copy of the L&I record was taken.
  • Apr 12, 2027: Scottsdale Ins Co liability policy on file expires.
  • Apr 13, 2028: 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 MAMMOCL762D8 or UBI 605485134. The status there is the official one.
  2. Check that the name on your bid or contract matches Mammoth 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 Scottsdale Ins Co 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 Sedro Woolley

Active general contractor registrations with a Sedro Woolley 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.

Is This Your Business?

Claim this free listing to add a description, photos and a website link, or join the featured waitlist.

Claim Your Listing or Get Featured on Verified Licensed

Something wrong or want this profile removed? Use the correction or removal request form.