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Best Licensed Insulation Contractors in Stockton, CA

7 insulation companies registered in Stockton hold current CSLB licenses, verified against official records as of August 17, 2026. All 7 are listed below, ordered by years licensed.

How we chose: We identified 7 companies registered in Stockton. 7 passed license verification. All 7 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.Roberts Firestop

    ✓ CSLB License #478057 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1985
    Phone
    (510) 867-5656

  2. 2.Stockton Ace Hardware Inc.

    ✓ CSLB License #623405 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1991
    Phone
    (209) 951-8050

  3. 3.Mc Laughlin Air Conditioning Co

    ✓ CSLB License #752342 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1998
    Phone
    (209) 465-5300

  4. 4.Thermo Bay Insulation

    ✓ CSLB License #1030570 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2017
    Phone
    (209) 938-8213

  5. 5.R-line Insulation Incorporated

    ✓ CSLB License #1075141 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2021
    Phone
    (209) 470-4494

  6. 6.Dominguez Construction Inc.

    ✓ CSLB License #1104617 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2023
    Phone
    (209) 210-2744

  7. 7.Thermacore Insulation Inc.

    ✓ CSLB License #1154818 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2026
    Phone
    (918) 927-0740

Compare the top 6 at a glance

CompanyLicenseWorkers' compLicensed since
Roberts Firestop#478057On file1985
Stockton Ace Hardware Inc.#623405On file1991
Mc Laughlin Air Conditioning Co#752342On file1998
Thermo Bay Insulation#1030570Exempt or none on file2017
R-line Insulation Incorporated#1075141On file2021
Dominguez Construction Inc.#1104617On file2023

San Joaquin County insulation licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 28 active C-2 insulation and acoustical licenses in San Joaquin County, 7 of them registered in Stockton. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Stockton license has been held 8 years, and the longest-standing one dates to 1985. California law requires workers' compensation cover for C-2 licensees, so it is a legal baseline rather than a way to tell two contractors apart: 5 of Stockton's 7 licenses (71.4%) carry a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 28 of the county's 28 licenses carry the same $25,000 bond California sets by statute. 1 county license reaches its 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.

Insulation Contractors in Stockton: common questions

How many licensed insulation contractors are there in Stockton?

7 active C-2 insulation and acoustical licenses are registered in Stockton, out of 28 across San Joaquin County. 7 Stockton-registered companies passed our license verification, and all 7 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.

Does California license insulation contractors?

Yes. California licenses contractors by classification, and C-2 is the CSLB classification that authorises this work. 7 active C-2 insulation and acoustical licenses are registered in Stockton and 28 across San Joaquin County, the longest-standing issued in 1985. Only CLEAR, unexpired licenses appear here.

How do I check an insulation 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-2 licensees and 5 of Stockton's 7 currently carry. 1 San Joaquin County license expires within 90 days.

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