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Best Licensed General Contractors in San Francisco, CA

1,981 general contractors registered in San Francisco hold current CSLB licenses, verified against official records as of August 22, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.

How we chose: We identified 1981 companies registered in San Francisco. 1981 passed license verification. The 8 below are the top-ranked of those. 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.Rainbow Waterproofing & Restoration Co

    ✓ CSLB License #148753 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1954
    Phone
    (415) 641-1578

  2. 2.Herreroboldt LLC

    ✓ CSLB License #152980 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1955
    Phone
    (415) 824-7675

  3. 3.Lewis M Merlo Inc.

    ✓ CSLB License #184527 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1959
    Phone
    (415) 346-1066

  4. 4.Sf Sierra Co Inc. DBA Sierra Electric Co

    ✓ CSLB License #184594 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1959
    Phone
    (415) 752-2850

  5. 5.Rossi Builders Inc.

    ✓ CSLB License #229568 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1964
    Phone
    (415) 982-6292

  6. 6.Nibbi Bros Associates Inc.

    ✓ CSLB License #232019 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1965
    Phone
    (415) 863-1820

  7. 7.John Brennan Company Inc.

    ✓ CSLB License #233608 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1965
    Phone
    (415) 552-0640

  8. 8.Molloy Construction Company

    ✓ CSLB License #244274 - look up this number at CSLB
    Verified
    August 22, 2026
    Licensed since
    1966
    Phone
    (415) 474-7808

Compare the top 6 at a glance

CompanyLicenseWorkers' compLicensed since
Rainbow Waterproofing & Restoration Co#148753On file1954
Herreroboldt LLC#152980On file1955
Lewis M Merlo Inc.#184527On file1959
Sf Sierra Co Inc. DBA Sierra Electric Co#184594On file1959
Rossi Builders Inc.#229568On file1964
Nibbi Bros Associates Inc.#232019On file1965

San Francisco County general building licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 2,090 active B general building contractor licenses in San Francisco County, 2,089 of them registered in San Francisco. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median San Francisco license has been held 15 years, and the longest-standing one dates to 1954. 962 of San Francisco's 2,089 licenses (46.1%) 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: 2,083 of the county's 2,090 licenses carry the same $25,000 bond California sets by statute. 167 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.

General Contractors in San Francisco: common questions

How many licensed general contractors are there in San Francisco?

2,089 active B general building contractor licenses are registered in San Francisco, out of 2,090 across San Francisco County. 1,981 San Francisco-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses CSLB shows as CLEAR and unexpired are listed.

Does California license general contractors?

Yes. California licenses contractors by classification, and B is the CSLB classification that authorises this work. 2,089 active B general building contractor licenses are registered in San Francisco and 2,090 across San Francisco County, the longest-standing issued in 1954. Only CLEAR, unexpired licenses appear here.

How do I check a general 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 962 of San Francisco's 2,089 currently carry. 167 San Francisco County licenses expire within 90 days.

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