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Best Licensed Insulation Contractors in Grass Valley, CA

3 insulation companies registered in Grass Valley 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 Grass Valley. 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.Gold Country Roofing

    ✓ CSLB License #453905 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1984
    Phone
    (530) 477-2760

  2. 2.Foam King

    ✓ CSLB License #1027544 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2017
    Phone
    (530) 777-0177

  3. 3.Mountain Insulation

    ✓ CSLB License #1137068 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2025
    Phone
    (530) 446-4466

Compare the top 3 at a glance

CompanyLicenseWorkers' compLicensed since
Gold Country Roofing#453905On file1984
Foam King#1027544On file2017
Mountain Insulation#1137068Exempt or none on file2025

Nevada County insulation licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 6 active C-2 insulation and acoustical licenses in Nevada County, 3 of them registered in Grass Valley. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Grass Valley license has been held 9 years, and the longest-standing one dates to 1984. 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: 2 of Grass Valley's 3 licenses (66.7%) carry a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 6 of the county's 6 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 Grass Valley: common questions

How many licensed insulation contractors are there in Grass Valley?

3 active C-2 insulation and acoustical licenses are registered in Grass Valley, out of 6 across Nevada County. 3 Grass Valley-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 insulation contractors?

Yes. California licenses contractors by classification, and C-2 is the CSLB classification that authorises this work. 3 active C-2 insulation and acoustical licenses are registered in Grass Valley and 6 across Nevada County, the longest-standing issued in 1984. 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 2 of Grass Valley's 3 currently carry. 1 Nevada County license expires within 90 days.

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