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Best Licensed Insulation Contractors in Redwood City, CA

3 insulation companies registered in Redwood City 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 Redwood City. 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.Bayside Equipment Company

    ✓ CSLB License #467763 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1985
    Phone
    (650) 368-3955

  2. 2.Bay Area Insulation Services

    ✓ CSLB License #1032509 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2017
    Phone
    (650) 499-6711

  3. 3.Delta Insulation Services Inc.

    ✓ CSLB License #1117247 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2024
    Phone
    (925) 505-1435

Compare the top 3 at a glance

CompanyLicenseWorkers' compLicensed since
Bayside Equipment Company#467763On file1985
Bay Area Insulation Services#1032509Exempt or none on file2017
Delta Insulation Services Inc.#1117247On file2024

San Mateo County insulation licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 9 active C-2 insulation and acoustical licenses in San Mateo County, 3 of them registered in Redwood City. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Redwood City 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: 2 of Redwood City'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: 9 of the county's 9 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 Redwood City: common questions

How many licensed insulation contractors are there in Redwood City?

3 active C-2 insulation and acoustical licenses are registered in Redwood City, out of 9 across San Mateo County. 3 Redwood City-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 Redwood City and 9 across San Mateo 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 2 of Redwood City's 3 currently carry. 1 San Mateo County license expires within 90 days.

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