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Best Licensed Concrete Contractors in Walnut, CA

3 concrete companies registered in Walnut hold current CSLB licenses, verified against official records as of August 17, 2026. All 3 are listed below, ordered by years licensed.

How we chose: We identified 3 companies registered in Walnut. 3 passed license verification. All 3 are listed below. Our methodology

We earn a fee when you call businesses through numbers on this site. This never affects who is listed or how they rank.

  1. 1.United Riggers & Erectors Inc.

    ✓ CSLB License #245451 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1966
    Phone
    (909) 978-0400

  2. 2.Mc Bobcat Concrete Services Inc.

    ✓ CSLB License #853899 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2005
    Phone
    (909) 896-5720

  3. 3.Claypool Frank Concrete Cutting Inc.

    ✓ CSLB License #938332 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2009
    Phone
    (909) 595-0708

Compare the top 3 at a glance

CompanyLicenseWorkers' compLicensed since
United Riggers & Erectors Inc.#245451On file1966
Mc Bobcat Concrete Services Inc.#853899On file2005
Claypool Frank Concrete Cutting Inc.#938332On file2009

Los Angeles County concrete licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 778 active C-8 concrete licenses in Los Angeles County, 3 of them registered in Walnut. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Walnut license has been held 21 years, and the longest-standing one dates to 1966. California law requires workers' compensation cover for C-8 licensees, so it is a legal baseline rather than a way to tell two contractors apart: 3 of Walnut's 3 licenses (100.0%) carry a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 776 of the county's 778 licenses carry the same $25,000 bond California sets by statute. 63 county licenses reach their expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.

Concrete Contractors in Walnut: common questions

How many licensed concrete contractors are there in Walnut?

3 active C-8 concrete licenses are registered in Walnut, out of 778 across Los Angeles County. 3 Walnut-registered companies passed our license verification, and all 3 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.

Does California license concrete contractors?

Yes. California licenses contractors by classification, and C-8 is the CSLB classification that authorises this work. 3 active C-8 concrete licenses are registered in Walnut and 778 across Los Angeles County, the longest-standing issued in 1966. Only CLEAR, unexpired licenses appear here.

How do I check a concrete contractor's license in California?

Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which California requires of C-8 licensees and 3 of Walnut's 3 currently carry. 63 Los Angeles County licenses expire within 90 days.

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