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Best Licensed Glass & Glazing Contractors in Concord, CA

23 glass companies registered in Concord hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.

How we chose: We identified 23 companies registered in Concord. 23 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.Diablo Glass Inc.

    ✓ CSLB License #611669 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1991
    Phone
    (925) 682-8271

  2. 2.Engineered Construction Services Corp

    ✓ CSLB License #715004 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1995
    Phone
    (925) 969-9245

  3. 3.Diablo Custom Screen

    ✓ CSLB License #739884 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1997
    Phone
    (925) 689-1100

  4. 4.Bestoff Windows And Construction

    ✓ CSLB License #769183 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1999
    Phone
    (925) 457-9026

  5. 5.Superior Window Works

    ✓ CSLB License #855238 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2005
    Phone
    (925) 413-9235

  6. 6.West Coast Windows & Doors Inc.

    ✓ CSLB License #890083 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2007
    Phone
    (925) 681-1776

  7. 7.Cadco Door & Window

    ✓ CSLB License #890397 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2007
    Phone
    (925) 383-9595

  8. 8.Concord Glass Inc.

    ✓ CSLB License #931921 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2009
    Phone
    (925) 777-9191

Compare the top 6 at a glance

CompanyLicenseWorkers' compLicensed since
Diablo Glass Inc.#611669On file1991
Engineered Construction Services Corp#715004On file1995
Diablo Custom Screen#739884On file1997
Bestoff Windows And Construction#769183Exempt or none on file1999
Superior Window Works#855238On file2005
West Coast Windows & Doors Inc.#890083On file2007

Contra Costa County glazing licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 81 active C-17 glazing licenses in Contra Costa County, 25 of them registered in Concord. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Concord license has been held 13 years, and the longest-standing one dates to 1988. 12 of Concord's 25 licenses (48.0%) 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: 81 of the county's 81 licenses carry the same $25,000 bond California sets by statute. 2 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.

Glass & Glazing Contractors in Concord: common questions

How many licensed glass and glazing contractors are there in Concord?

25 active C-17 glazing licenses are registered in Concord, out of 81 across Contra Costa County. 23 Concord-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 glass and glazing contractors?

Yes. California licenses contractors by classification, and C-17 is the CSLB classification that authorises this work. 25 active C-17 glazing licenses are registered in Concord and 81 across Contra Costa County, the longest-standing issued in 1988. Only CLEAR, unexpired licenses appear here.

How do I check a glazing 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 12 of Concord's 25 currently carry. 2 Contra Costa County licenses expire within 90 days.

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