Siefken & Sons Const Inc

Is Siefken & Sons Const Inc Licensed?

Washington L&I records list Siefken & Sons Const Inc with registration number SIEFKSC198MZ and status ACTIVE, valid until Jul 15, 2027. The business address on file is in Richland, WA 99352.

License Details

License #

SIEFKSC198MZ

Status

ACTIVE

License type

Construction Contractor

Specialty

General

First effective

Jul 9, 1981

Expires

Jul 15, 2027

Business type

Corporation

UBI (state business ID)

600402552

City

Richland, WA 99352

Bond and Insurance on File

Surety bond

$30,000 · Travelers Cas and Surety Co of America
Effective Jun 19, 2025 · Until Canceled

Liability insurance

$1,000,000 · Cincinnati Ins Co
Expires Jun 19, 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 256 days left before it expires on Jul 15, 2027. Check that date against your project timeline.

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

How This Record Compares in Richland

Siefken & Sons Const Inc has held registration SIEFKSC198MZ for 45.3 years. The median for the 250 active general contractors with a Richland address is 5.4 years, and 81 of them have held their registration for 10 years or more, so this registration is among the longer-held ones. 36 of them registered in the last 12 months.

100% of these Richland 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

• Jul 9, 1981: Current registration SIEFKSC198MZ took effect.
• Jun 19, 2025: $30,000 surety bond with Travelers Cas and Surety Co of America took effect.
• Oct 30, 2026: Our copy of the L&I record was taken.
• Jun 19, 2027: Cincinnati Ins Co liability policy on file expires.
• Jul 15, 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

1. Use the Confirm on L&I Verify button and search registration SIEFKSC198MZ or UBI 600402552. The status there is the official one.
2. Check that the name on your bid or contract matches Siefken & Sons Const Inc exactly (a corporation).
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 Cincinnati 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 Richland

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

• 1Co · General · expires Oct 5, 2028
• 3C Company · General · expires May 28, 2028
• A & R General Contractor LLC · General · expires Feb 27, 2028
• A1 Flooring LLC · General · expires Jun 5, 2028
• Adrian'S Pro Plumbing LLC · General · expires Jul 20, 2028
• Advanced Comm Flooring Inc · General · expires Mar 19, 2028
• Afn Construction LLC · General · expires Jun 5, 2028
• Ai Signature Pool Solutions · General · expires Sep 23, 2027

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