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Best Licensed Door & Gate Contractors in San Mateo, CA

4 door and gate companies registered in San Mateo hold current CSLB licenses, verified against official records as of August 17, 2026. All 4 are listed below, ordered by workers' compensation cover and years licensed.

How we chose: We identified 4 companies registered in San Mateo. 4 passed license verification. All 4 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.Alert Door Service Inc.

    ✓ CSLB License #398025 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1981
    Phone
    (650) 342-7521

  2. 2.Shell Door Service Inc.

    ✓ CSLB License #877655 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2006
    Phone
    (650) 704-8600

  3. 3.Door & Gate Company Inc.

    ✓ CSLB License #1082652 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2021
    Phone
    (415) 225-9515

  4. 4.Golden State Overhead Doors

    ✓ CSLB License #701045 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1995
    Phone
    (650) 571-6150

Compare the top 4 at a glance

CompanyLicenseWorkers' compLicensed since
Alert Door Service Inc.#398025On file1981
Shell Door Service Inc.#877655On file2006
Door & Gate Company Inc.#1082652On file2021
Golden State Overhead Doors#701045Exempt or none on file1995

San Mateo County door and gate licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 44 active D-28 doors, gates and activating devices licenses in San Mateo County, 4 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 20 years, and the longest-standing one dates to 1981. 3 of San Mateo's 4 licenses (75.0%) carry current workers' compensation cover in CSLB's file. That is employee injury cover, not liability insurance, and a blank usually means an owner-operator with no employees - lawful, and not a mark against anyone. The contractor bond is not a signal here: 44 of the county's 44 licenses carry the same $25,000 bond California sets by statute. 7 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.

Door & Gate Contractors in San Mateo: common questions

How many licensed door and gate contractors are there in San Mateo?

4 active D-28 doors, gates and activating devices licenses are registered in San Mateo, out of 44 across San Mateo County. 4 San Mateo-registered companies passed our license verification, and all 4 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.

Does California license door and gate contractors?

Yes. California licenses contractors by classification, and D-28 is the CSLB classification that authorises this work. 4 active D-28 doors, gates and activating devices licenses are registered in San Mateo and 44 across San Mateo County, the longest-standing issued in 1981. Only CLEAR, unexpired licenses appear here.

How do I check a door and gate 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 3 of San Mateo's 4 currently carry. 7 San Mateo County licenses expire within 90 days.

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