General contractor · Milton, WA

Mountain Construction Serv LLC

Active Washington registration MOUNTCS766NA · per L&I records

LicensedNo Bond on FileInsured

Is Mountain Construction Serv LLC Licensed?

Washington L&I records list Mountain Construction Serv LLC with registration number MOUNTCS766NA and status ACTIVE, valid until Aug 4, 2028. The business address on file is in Milton, WA 98354.

License Details

License #: MOUNTCS766NA
Status: ACTIVE
License type: Construction Contractor
Specialty: General
First effective: Aug 1, 2024
Expires: Aug 4, 2028
Business type: Limited Liability Company
UBI (state business ID): 605327272
City: Milton, WA 98354

Bond and Insurance on File

Surety bond: No current bond listed in the L&I bond file
Liability insurance: $1,000,000 · Atlantic Casualty Ins Co
Expires Jul 3, 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 643 days left before it expires on Aug 4, 2028. Check that date against your project timeline.

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

Checks for General Contractors

General contractors must file a $30,000 surety bond (RCW 18.27.040, effective July 1, 2024). This record lists no current 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 MOUNTCS766NA or UBI 605327272. The status there is the official one.
Check that the name on your bid or contract matches Mountain Construction Serv 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 Atlantic Casualty 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.

Other General Contractors in Milton

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

1-800 Water Damage/S Pgt Sd · General · expires Jan 27, 2027
123 Best Construction LLC · General · expires Jun 2, 2027
3M100% Construction · General · expires Aug 17, 2028
Ab Construction Svcs Nw LLC · General · expires Oct 20, 2027
Able Industries Inc · General · expires Sep 9, 2028
Ad Maintenance&Care LLC · General · expires Nov 19, 2027
Adapt Building Development LLC · General · expires Jan 27, 2027
Al Lind Co · General · expires Jul 2, 2028

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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