Homversa

Best Licensed Insulation Contractors in San Mateo, CA

Homversa lists 3 insulation companies registered in San Mateo holding current CSLB licenses, matched against the CSLB licensee file as of . All 3 are listed below, ordered by years licensed.

How we chose: We identified 3 insulation companies registered in San Mateo. Every one of them holds a current license, checked against the official register. 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.O'riordan Construction Inc.

    ✓ CSLB License #670221 - look up this number at CSLB (opens in a new window)

    On the CSLB register since 1993, with bonded at $25,000.

    Verified
    Registered in
    San Mateo, CA 94402
    Licensed since
    Phone
    (415) 308-8880

  2. 2.Ryan Builders Inc.

    ✓ CSLB License #932142 - look up this number at CSLB (opens in a new window)

    On the CSLB register since 2009, with workers' compensation cover on file and bonded at $25,000.

    Verified
    Registered in
    San Mateo, CA 94402
    Licensed since
    Phone
    (408) 472-7993

  3. 3.The Bay Area Insulation

    ✓ CSLB License #1130303 - look up this number at CSLB (opens in a new window)

    On the CSLB register since 2024, with bonded at $25,000.

    Verified
    Registered in
    San Mateo, CA 94401
    Licensed since
    Phone
    (650) 580-3391

Compare the top 3 at a glance

Swipe the table sideways for all columns - the company name stays put.

Compare the top 3 Licensed Insulation Contractors in San Mateo, CA
Insulation ContractorLicenseWorkers' compLicensed since
O'riordan Construction Inc.#670221Expired on file1993
Ryan Builders Inc.#932142On file2009
The Bay Area Insulation#1130303Exempt or none on file2024

How this page is built

Nobody pays to appear on this page, and position cannot be bought. A company is listed only where the official register showed it holding a current license when we checked on September 4, 2026.

  • Ranked by years licensed.
  • Left off anything expired on the date we checked, or carrying any status other than current.
  • Not published at all until at least 3 insulation companies pass that check. At most 10 appear - a cut through the ranking, not a further test.

The full method, including what each register does and does not publish.

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: 10 active C-2 insulation and acoustical licenses in San Mateo County, 3 of them registered in San Mateo. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median San Mateo license has been held 17 years, and the longest-standing one dates to 1993. 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: 1 of San Mateo's 3 licenses (33.3%) carries a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 10 of the county's 10 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 San Mateo: common questions

How many licensed insulation contractors are there in San Mateo?

3 active C-2 insulation and acoustical licenses are registered in San Mateo, out of 10 across San Mateo County. 3 San Mateo-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 San Mateo and 10 across San Mateo County, the longest-standing issued in 1993. 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 1 of San Mateo's 3 currently carry. 1 San Mateo County license expires within 90 days.

Why is a company not on this list?

A company appears only when we can match it to a current record in the register this page is verified against - 3 companies passed that match for San Mateo. A credential that is expired or suspended, or a business we cannot conclusively match to a current record, never appears. A listed business that believes its information is wrong can reach us through the contact and corrections page at homversa.com/contact. How current each date is, and what happens when a credential lapses, are explained on our methodology page.

Which nearby cities have verified insulation contractors?

Redwood City (3 verified), Hayward (15 verified), San Lorenzo (3 verified), San Leandro (10 verified) and Oakland (10 verified) each publish their own list, verified separately against the state register, so the counts differ city by city. The links are in the nearby-cities section below.

Other services in San Mateo

All 19 trades in San Mateo

Insulation Contractors in nearby cities

Deepest nearby market: Hayward ranks 10 insulation companies for this trade within the same area.

All insulation contractors in California

Before you call: guides worth two minutes