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Best Licensed Solar Contractors in Napa, CA

4 solar companies registered in Napa 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 Napa. 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.Peterson & Sons Inc. DBA Green Stock Solar

    ✓ CSLB License #961800 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2011
    Phone
    (925) 998-8929

  2. 2.Smartbuilt Inc.

    ✓ CSLB License #1141919 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2025
    Phone
    (707) 956-9199

  3. 3.Cross Valley Construction

    ✓ CSLB License #584644 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1990
    Phone
    (707) 494-3811

  4. 4.J R Construction - Sol Solutions Inc.

    ✓ CSLB License #953923 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2010
    Phone
    (707) 299-8850

Compare the top 4 at a glance

CompanyLicenseWorkers' compLicensed since
Peterson & Sons Inc. DBA Green Stock Solar#961800On file2011
Smartbuilt Inc.#1141919On file2025
Cross Valley Construction#584644Exempt or none on file1990
J R Construction - Sol Solutions Inc.#953923Exempt or none on file2010

Napa County solar licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 5 active C-46 solar licenses in Napa County, 4 of them registered in Napa. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Napa license has been held 15 years, and the longest-standing one dates to 1990. 2 of Napa's 4 licenses (50.0%) 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: 5 of the county's 5 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.

Solar Contractors in Napa: common questions

How many licensed solar contractors are there in Napa?

4 active C-46 solar licenses are registered in Napa, out of 5 across Napa County. 4 Napa-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 solar contractors?

Yes. California licenses contractors by classification, and C-46 is the CSLB classification that authorises this work. 4 active C-46 solar licenses are registered in Napa and 5 across Napa County, the longest-standing issued in 1990. Only CLEAR, unexpired licenses appear here.

How do I check a solar 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 2 of Napa's 4 currently carry. 1 Napa County license expires within 90 days.

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